CA2062533A1 - Method and apparatus for testing a valve - Google Patents
Method and apparatus for testing a valveInfo
- Publication number
- CA2062533A1 CA2062533A1 CA002062533A CA2062533A CA2062533A1 CA 2062533 A1 CA2062533 A1 CA 2062533A1 CA 002062533 A CA002062533 A CA 002062533A CA 2062533 A CA2062533 A CA 2062533A CA 2062533 A1 CA2062533 A1 CA 2062533A1
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- Canada
- Prior art keywords
- current intensity
- magnet
- valve
- force
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 230000006870 function Effects 0.000 claims abstract description 49
- 230000004044 response Effects 0.000 claims abstract description 37
- 230000015654 memory Effects 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 11
- 238000012937 correction Methods 0.000 claims description 31
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005314 correlation function Methods 0.000 claims 2
- 238000005065 mining Methods 0.000 claims 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 210000001550 testis Anatomy 0.000 description 1
- 230000001702 transmitter Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Stringed Musical Instruments (AREA)
- Electrophonic Musical Instruments (AREA)
- Feedback Control In General (AREA)
- Measurement Of Current Or Voltage (AREA)
- Cable Accessories (AREA)
- Magnetically Actuated Valves (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Abstract of the Disclosure:
A method for testing a valve being driven by an electromagnet having a magnet armature, includes determining a value of current intensity in the magnet as a response current inten-sity, at an instant when motion of the magnet armature of the valve begins during a switching action of the valve. A force acting through the magnet upon the magnet armature is deter-mined from the determined response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the valve. An apparatus for testing a valve being driven by an electromagnet having a magnet armature and an electrical circuit, includes a current intensity meter in the electrical circuit of the magnet. A
computer is connected to the current intensity meter. A
memory for a calibration function is connected to the comput-er for indicating a dependency of a force acting upon the magnet armature on a current intensity in the electrical circuit of the magnet.
A method for testing a valve being driven by an electromagnet having a magnet armature, includes determining a value of current intensity in the magnet as a response current inten-sity, at an instant when motion of the magnet armature of the valve begins during a switching action of the valve. A force acting through the magnet upon the magnet armature is deter-mined from the determined response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the valve. An apparatus for testing a valve being driven by an electromagnet having a magnet armature and an electrical circuit, includes a current intensity meter in the electrical circuit of the magnet. A
computer is connected to the current intensity meter. A
memory for a calibration function is connected to the comput-er for indicating a dependency of a force acting upon the magnet armature on a current intensity in the electrical circuit of the magnet.
Description
GR 91 P 3112 206~533 VALVE
METHOD AND APPARATUS FOR TESTING A ~ff~
SPecification:
valve The invention relates to a method for testing a ~ ~ driven by an electromagnet that has a magnet armature. It also relates to an apparatus for testing such a valves Electrom~gne~-driven ~x~ can change their operating behavior. This can be ascribed to wear of mechanically moved parts and can cause impairment of a sealing and in an extreme case failure of the ro~lo~.
It is therefore necessary for all safety-relevant ~ to be repeatedly checked for their functional capability. This is especially true for ro~or 5 in a nuclear reactor system.
Previously, in order to check the functional capability of a ~e, the electrical circuit ~upplying it was switched on and off, and it was then dstermined whether the ~ ~ closed or opened.
It is accordingly an object of ~he invention to provide a method and an apparatus for testing a ~ which overcome the hereina~ore-mentioned disadvantages of the hereto~ore-known methods and devices of this general type and which valveevaluate the functional capability of the ~e~r by using 2~62~3~
variable with which a statement that is always reliable can be made.
With the foregoing and other objects in view there is provid-ed, in accordance with the invention, a method for testing a valve rotor- being driven by an electromagnet having a magnet armature, which comprises determining a value of current intensity in the magnet as a response current intensity, at an instant when motion of the magnet armature of the ~
begins during a switching action of the rot~; and determin-ing a ~orce acting through the magnet upon the magnet arma-ture from the determîned response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the ~e~.
As a rule, the magnet armature is coupled to a closure element or blind of the ro~o~.
Through the use of the previously determined calibration function, the force exerted by the magnet on the closure element can advantageously be determined for the moment at which the motion o~ the closure element begins. The value of this ~o-called response force can be determined quickly and reliably by simple means. Moreover, the response forc~ i~
very well-suited for a reliable statement as to the condition valve reference of the ~o~. If the response force deviates from a ~c~ w~
value, then mainte~ance or even replacement of the tested valve ~43P must be perform~d.
In accordance with another mode of the invention, in order to determine the response current intensity, there is provided a method which comprises picking up the course of the current intensity at the magnet, for instance duriny a switching action o~ the ~ and for instance when the rated voltage of the rotor is applied, and determining the current intensi-ty at the first discontinuity as the response current inten-sity, from this course.
This can be accomplished since the current intensity course initially increases continuously aftQr the application of a voltage to the magnet, and then exhibits a first discontinui-ty whenever the motion of the magnet armature/closure element begins. The course of current intensity has a second discon-tinuity once the motion of the magnet armature is ended.
Between the two discontinuities, the current intensity course may drop for a brief period of time. After the second di~continuity, the current intensity course rises continuous-ly once again, until it attain5 a constant value. According-ly, the current intensity course over time exhibits a first di~continuity, which i5 equivalent to the response current intenæity.
In accordance with a further mode of the invention, there is provided a method which comprises differentiating the current -3o .- . " ~ ~ i ;.
~0~2~3~ `
intensity course, and deter~ining the first discontinuity in the dif~erentiated current intensity course. The discontinu-ity in the differentiated current intensity course is more clearly recognizable than the discontinuity in the current intPnsity course. The response current intensity is then the current intensity at the instant of the first discontinuity in the differentiated current intensity course.
In typical turn-on actions, the current intensity increases quickly. Eddy currents arise, which influence the functional relationship between force and current intensity. In order to correct this influence, in accordance with an added mode of the invention, there is provided a method which comprises decreasing the current intensity measured on the ~ to be tPsted by the eddy current intensity, which is a function o~
the current intensity and the variation over time of the current inten~ity.
The eddy current intensity can also include other leaXage current intensities. In accordance with an additional mode of the invention, there is provided a method which comprise~
determining the eddy current intensity by measuring not only the current intensity but, for instance, the variation in the current inten~ity as well. With the aid of a correction ~actor, the eddy current inten~ity can then be determined and thus the current inten~ity can be corrected.
2~62~33 With the correction, an advantage is attained which is that in a fast current intensity increase in the magnet, and even if the voltage deviates markedly from the rated voltage, the force on the moving parts of the ~4~, ancl in particular the response force, can be determined. If a high voltage i~
applied, the current intensity increase is in fact greater than when a low voltage is applied.
In order to determine the response force, the calibration function and the correction factor must be furnished. To this end, base measurements are necessary that precede the actual test and can, for instance, be carried out in a laboratory.
"
For instance, in accordance with yet another mode of the invention, there is provided a method which comprises ascer-taining the calibration function for a ~eneri¢ally identical or similar-type ~ by measurement of the forc~ acting upon an arrested magnet armature by means of a magnet, a~ a function o~ the current intensity in the magnet.
In accordance with yet a further mode of the invention, there is provided a method which comprises ascertaining th~ cali-bration function by arresting moving parts in a generically valve idenSical or ~imilar-type ~4~e~, for instance by mean~ o~ a iorce ~ ~, then applying an electrical voltage to the magnet and then slowly increasing the voltage, and i~ochronously recording the current intensity rising with the -- . ~
; ~62~33 voltage and the force generated by the magnet, and expressing the relationship between the force and the current intensity in the calibration function.
This calibration function makes it possible to determine the instantaneously exerted force for any measured current intensity value, if there are no eddy currents. Using the calibration function has the advantage that a simple measure-ment of current intensity suffices to determine the force, valveand in particular the response force of the ~
Since a ~e~e~ that is generally identical to the ~*e to be tested later is used to ascertain the calibration function, the calibration function can be used unrestrictedly. Howev-er, a separate calibration function must be picked up for each ~ type to be tested.
Since the moving parts of the fl~eff~ are arrested by a force absorber in order to ascertain the calibration function, the exerted force can be measured exactly. Force value~ are obtained not only for current intensity values below the response current intensity but also for higher current intensity value~.
For instance, in accordance with yet an added mode of the invention, there is provided a method which comprises ex-pressin~g the calibration function as a polynomial:
~06~3 ~
F = a ~ al I + a2 ' I' + ..- + anI
In this equation, F is the force of the magnet llpOn the moving parts, I is the current intensity in the magnet, and a is a polynomial coefficient. The calibration function found is well represented by a polynomial.
In order to correct the eddy current influences, the di~fer-ence between the measured current intensity It and the eddy current intensity Iw should also be inserted as the current intensity I in the polynomial of the calibration function, which represents the functional relationship between the valve force upon the moving parts of the ~, on one hand, and valve the current intensity in the magnet of the ~, on the other hand. Accordingly, as an eddy-current-corrected current intensity Ik, the following should be inserted for I:
Ik ~ I~ Iw It is known that the eddy current Iw is proportional to the measured current It and its variation over time, dIt/dt.
From this it can be concluded that Iw c It t/
where c is the correction ~actor.
., - ~625~3 From these last two equations, by mathematical conversion ~or the corrected current intensity Ik, it follows that, Ik It ' ( 1 - C ~ dIt/dt) ~
This equation for the corrected current intensity Ik is inserted into the calibration function. As a result, the calibration function which i5 corrected in terms of the eddy current is obtained, and continues to be in the form of a polynomial.
In accordance with yet an additional mode of the invention, valve there is provided a method which comprises testing a ~ by determining the correction factor c. To this end, first, in two ~t~p~, with two different constant voltages that are appl~ed to the magnet, the current intensity course, the course of the variation over time of the current intensity, and the course of the force at the turn-on action are deter-valve mined at the generically identical ~t4~ arrested with a : force ~ ~ . Accordingly, for each of the two voltage~
one current intensity course, one course of the current intensity variation and one ~orce course over time are obtained.
In the ensuing description it is assumed that ~or an equ~l force, the current intensity Ik that is corrected in terms o~
th~ eddy current must be the same. ~or a particular, identi cal force, the measured current intensities It~U1) an~ It(U23 2~62~33-and their variation (dIt/dt)U1 and (dIt/dt)U2 are therefor determined.
Since Ik(Ul) and Ik(U2) are equal, it follows that:
I~ (U~ C (dIt/dt)Ul) = It(U2) (1 - C (dIt/dt)U2)-For the correction factor, it follows that:
It (Ul ) - It (U2 ) (It dIt/dt)~ It dIt/dt)U2 The value found for the correction factor c should then be inserted into the equation for the corrected current intensi-ty Ik and thus into the calibration function.
With the aid of the calibration function, the associated force K can be determined merely from the measured current intensity It, and the response force KA can be determined merely from the response current intensity IA.
With the method of the invention, particularly with the xpanded correction proces5, an advantage is attained which valve is ~h~t~ reliable indicatlon of the condition o~ a ~e~e~ can be obtained solely with a simple measurement of current intensity.
_g_ 2~2S33 -With the objects of the invention in view, there is also provided, in an assembly of a ~ being driven by an electromagnet~ having a magnet armature and an electrical circuit, an apparatus for testing the ~ , comprising a current intensity meter in the electrical circuit of the magnet; a computer connected to the current intensity meter;
and a memory for a calibration function being connected to the computer for indicating a dependency of a force acting upon the magnet armature on a current intensity in the electrical circuit of the magnet.
In the computer, the meas~red current intensity is linkad to the memorized calibration function, so that a value for the force is present at the output of the computer. This value is compared for deviation with a command value, and if there is a deviation then a signal is output, for instance by a signal transmitter. The memory for the calibration function may also be a movable memory, such as a diskette.
In accordance with another feature of the invention, the computer is connected to a display apparatus, such as a screen or a plotter, which are capable of display:ing the course over time of the current intensity or the differenti-ated current intensity. Any discontinuity, such as a maxi-mum, ~hown on the display device, will be recognized by a person as a turn-on instant.
2~62~33 A cursor may be used for this purpose. The value of the current intensity at the turn-on instant is determined in the computer. The force at the turn-on instant (response force) is then calculated for thi~ turn-on current intensity.
The turn-on current intensity can also be autematically ascertained by a computer from the measured course of current intensity, without a person having to study the course of current intensity.
With the expanded apparatus, the force that acts upon moving par~s o-the ~ whenever the motion begins, is studied as a response force. This force provides an optimal indication as to the condition of the ~o~o~.
In accordance with a further feature of the invention, in order to correct the influence of an eddy current upon the measured current intensity, a subtractor is used, which is connected to the output side of the current intensity meter and as a rule is integrated with the computer. The associat-ed eddy current value i~ delivered to another input of the subtractor. In order to determine this eddy current value, the current intensity meter is connected to a computer to which a correction ~aator can also be supplied. The eddy current value i3 determined in the computer from this factor an~ ~rom the current lntensity value and the differentiated current intensity.
In accordance with an add0d feature of the invention, there is provided a calibration apparatus, disposed in a laborato-ry, for instance, to ascertain the necessary calibration function. It has a generically identical or similar-type , the ~oving parts of which, in particular its magne~
armature or closure element or blind, are arrested by a force ab~or~. The maqnet of the generically identical ~ ~ is connected to a variable voltage transmitter. A current intensity meter is located in the electrical circuit of the magnet. Otherwise the calibration apparatus is largely equivalent to thP apparatus that is used to test a ~u~.
Different voltages may be applied automatically or manually.
For each voltage value, a pair of values for current intensi-ty and force is then determined, and from the pairs of values the calibration function is formed in a correction element, which may be part of a compùter. Downstream of the correla-tion element is the aforementioned memory for the calibration function. The memory may be a tran~portable memory, such as a diskette.
In accordance with a concomitant feature of the invention, in meter ordar to determine the correction factors, the forcle ~nK~i~c~
is connected, E~r-~6~ c~directly, and the current intensi-valve ty meter of the a~orementioned generically identical ~e~e~ ls connected directly and through a differentiator, ~CU iFU~
to memories, in order to store in memory the current inten~i-ty courses, the courses of current intensity variation, and the courses of force at the turn-on action for two different, 2Q~2533 -~
... .....
constant voltages. The memories are connected to a selection and calculation unit for selecting the current intensities and current intensity variations for the two voltages at a constant force and for calculating the correction factor.
The differentiator, the memories and the selection and calculation unit may be part of a computer for determining the correction factor. Downstream of the selection and calculation unit or computer is a memory for the correction factor, for instance a transportable memory such as a disk-ette.
The correction factor can also be stored in memory on a data carrier for later use.
With the apparatus according to the invention for testing a -rotor driven by an electric magnet, an advantage is attained which is that once calibration has been done, only the current intensity course needs to be measured at the magnet.
Nevertheless, a reliable statement as to the force acting valve upon the moving parts of the~K~ at the instant that motion begins, is obtained. This force permits an unequivocal statement to be made as to the instantaneous condition o~ the v alve -~ot~, ..
Other features which are considered as characteristic for the invention are set forth ~n the appended claims.
-13- ~ ~
2062~33 Although the invention is illustrated and described herein a~
embodied in a method and an apparatus for testing a rotor, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The`construction and method of operation of the inv2ntion, however, together with additional objects an~ advantages thereof will be best understood from the following clescrip-tion of specific embodiments when read in connection with the accompanying drawings.
Fig. 1 is a graph sho~ing a course of a current intensity It valve at a magnet of a magnetically driven ~ in a turn-on action over a time t;
Fig. 2 includes a schematic circuit diagram of an apparatus for testing a ~re~ driven by an electric magnet and a valve diaqrammatic elevational view of the ~ and magnet; and Fig. 3 is a view simllar to Fig. 2 including a circuit diagram o~ a laboratory apparatus for furnishin~ a calibra-tion function and a correction factor.
Referring now to the figures of the drawing in detail and first, particularly, to Figs. 1 and 2 thereof, it is seen that if A voltage is applied to a magnet la of a magnet-driv-en = 2a as seen in Fig. 2, then the current intensity It in the electrical circuit of the magnet la initlally rises as shown in Fig. 1. Once the motion of moving parts~ for instance a magnet armature 3a or a closure element or blind 4a of the = 2a begins, the current intensity It drops briefly, or after some discontinuity rises less quickly than before. Subsequently, after a further discontinuity, the current intensity It again rises as before ~nd attains a constant value. In order to determine the so-called response current intensity IA, in other words the current intensity at valve the instant when the motion of the moving parts of the_~;
2a begins, it is sufficient to determine the first disconti-nuity or the maximum point in the current intensity course.
To this end, the current intensity course is differentiated, and then the first discontinuity or the zero crossover is determined there. A force KA exerted upon response of the 2a is determined from the response current intensity IA, with a calibration function KF. This gives an optimal valve indication as to the functional capability of the ~e~ 2a.
In order to d~termine the calibration function KF and a correction factor c, ~ Y~ 2b which is generically ldenti-cal or of the same type is used, in which moving parts, for in~tance a clo~ure element or blind 4b and a magnet armature meter 3b, are blocked by a ~orce d~Pbe~ or transducer 5, as seen in Fig. 3.
2~2~33 -A correction of the eddy eurrent influences may be performed, in order to improve the acc~lracy of the evaluation.
In Fig. 2, the apparatus for~ testing according to the invention has a current intensity meter 6a in the magnet~ -circuit of the ~ 2a to be tested. In order to correct the influences of eddy currents, the curreot intensity meter 6a is connected to one input of a subtractor 7, having ~ her input which receives an eddy current intensity value Iw. A
corrected current intensity Ik is present at the output of the subtractor 7. In order to determine the response curren~
intensity IA of the ~ 2a at which the motion of the 2a begins, an output of the subtractor 7 is connectecl to a selection unit 8. In the selection unit, a maximum point or a discontinuity of the current intensity course shown in Fig.
1 or of the differentiated current intensity course is determined. The response current intensity IA~ which is corrected in terms of the eddy current, is present at the output of the selection unit 8. The output of the selection unit 8 is connected to a computer 9, to which the calibration function KF can be supplied from a memory 10 shown in Fig. 3.
Instead of the selection unit 8, a screen or plotter unit may be u~ed, with the a~d of which a person can then make the selection of the response current intensity IA. The response rurrent intensity IA must then be read into the computer 9.
The response ~orce KA upon the moving parts, for inætance valve upon the closure element 4a of the ~Y~ 2a, corresponding to the response currenk intensity IA, is present at the output , .
20~2533 -`
of the computer ~. The output of the computer 9 is connect-ed, for instance, through a command value comparator 11, to a signal transmitter 12, for instance, which indicates a deviation of the force value from a command value and thus valve provides an indication as to the condition of the-~etor- 2a.
The subtractor 7, the selection unit 8 or a screen, the . .
computer 9, and so forth, can together form a higher-level computer.
In order to calculate the eddy current intensity Iw, the current intensity meter 6a is connected to a~ additional computer 14, which includes a differentiator and to which the correction factor c can be supplied. This computer 14 may be part of the higher-level computer.
As mentioned above, in Fi~. 3, the ~e~ 2b, which is generi-valve cally identical to or of the same type as the ~4~ 2a to be teste~, is used in the laboratory to determine the calibra-valve tion function KF. Again, in this generically identical ~Y~
2b, the moving part~, for inqtance the closure element 4b or meter the magnet armature 3b, are blocked by the force a~GerD~ 5.
A current intensity meter 6b and a variable voltage transmit-ter 16 ara located in the electrical c:ircuit ~f the magnet meter lb. Both the force ~t~4~ 5 and the current intensity meter 6b communicate with a correlation element 17, in which the calibration function KF is determined from measured pair~
of values for a force K and a current intensity I. Tha correlation element 17 i~ connected to the memory 10 ~or the 2~62533-`
calibration function KF. The correlation element 17 may be a computer.
In order to determine the correction factor c, which is necessary for determining the eddy current intensity Iw, the current intensity meter 6b and the force ~}~c~ 5 of the generically identical-ro~ 2b, which are already used for determining the calibration function KF, are connected to a laboratory computer 18. There, current intensity courses, differentiated current intensity courses, and force course~
are stored in memory for two different voltages U1 and U2 that are generated by the voltage transmitter 16. For a specific fixed force, two associated current intensities Iu and Iu2 are selected from the two current intensity courses.
Corr~sponding current intensity variations (dIt/dt)ul and (dI~/dt)u2 are selected from the two differentiated current intensity courses. The correction factor c, which is nece~-sary for the eddy current correction, is determined from these values. An output of the computer 18 is connected to a correction value memory lg. The computer 18 may include the correlation element 17. The computer 18 may have a screen or a plotter unit, with the aid of which a person can then read the values for the current intensity Iul and Iu2 and for the CUrrent inten~ity varlation ~dIt/dt)u1 and (dIt/dt)u2 off from curves. These values must then be entered into the computer 18. The laboratory computer 18 may be structurally valve identical to a computer that is u~ed in testing the iY~ 2a.
2~2533 With the method and with the apparatus shown for testing the 2a, it is advantageously possible, after determining the calibration function KF and the correction factor c, to xeliably and accurately determine the force KA exerted upon response of the ~4~U} 2a upon the moving parts, for instance the closure element 4a o the roto~ 2a, merely from the current intensity It in the electrical circuit of the magnet la, which can be measured by simple means. This response force KA permits an unequivocal statement to be made as to valve the condition of the dX~U~ 2a.
.. ........ .
METHOD AND APPARATUS FOR TESTING A ~ff~
SPecification:
valve The invention relates to a method for testing a ~ ~ driven by an electromagnet that has a magnet armature. It also relates to an apparatus for testing such a valves Electrom~gne~-driven ~x~ can change their operating behavior. This can be ascribed to wear of mechanically moved parts and can cause impairment of a sealing and in an extreme case failure of the ro~lo~.
It is therefore necessary for all safety-relevant ~ to be repeatedly checked for their functional capability. This is especially true for ro~or 5 in a nuclear reactor system.
Previously, in order to check the functional capability of a ~e, the electrical circuit ~upplying it was switched on and off, and it was then dstermined whether the ~ ~ closed or opened.
It is accordingly an object of ~he invention to provide a method and an apparatus for testing a ~ which overcome the hereina~ore-mentioned disadvantages of the hereto~ore-known methods and devices of this general type and which valveevaluate the functional capability of the ~e~r by using 2~62~3~
variable with which a statement that is always reliable can be made.
With the foregoing and other objects in view there is provid-ed, in accordance with the invention, a method for testing a valve rotor- being driven by an electromagnet having a magnet armature, which comprises determining a value of current intensity in the magnet as a response current intensity, at an instant when motion of the magnet armature of the ~
begins during a switching action of the rot~; and determin-ing a ~orce acting through the magnet upon the magnet arma-ture from the determîned response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the ~e~.
As a rule, the magnet armature is coupled to a closure element or blind of the ro~o~.
Through the use of the previously determined calibration function, the force exerted by the magnet on the closure element can advantageously be determined for the moment at which the motion o~ the closure element begins. The value of this ~o-called response force can be determined quickly and reliably by simple means. Moreover, the response forc~ i~
very well-suited for a reliable statement as to the condition valve reference of the ~o~. If the response force deviates from a ~c~ w~
value, then mainte~ance or even replacement of the tested valve ~43P must be perform~d.
In accordance with another mode of the invention, in order to determine the response current intensity, there is provided a method which comprises picking up the course of the current intensity at the magnet, for instance duriny a switching action o~ the ~ and for instance when the rated voltage of the rotor is applied, and determining the current intensi-ty at the first discontinuity as the response current inten-sity, from this course.
This can be accomplished since the current intensity course initially increases continuously aftQr the application of a voltage to the magnet, and then exhibits a first discontinui-ty whenever the motion of the magnet armature/closure element begins. The course of current intensity has a second discon-tinuity once the motion of the magnet armature is ended.
Between the two discontinuities, the current intensity course may drop for a brief period of time. After the second di~continuity, the current intensity course rises continuous-ly once again, until it attain5 a constant value. According-ly, the current intensity course over time exhibits a first di~continuity, which i5 equivalent to the response current intenæity.
In accordance with a further mode of the invention, there is provided a method which comprises differentiating the current -3o .- . " ~ ~ i ;.
~0~2~3~ `
intensity course, and deter~ining the first discontinuity in the dif~erentiated current intensity course. The discontinu-ity in the differentiated current intensity course is more clearly recognizable than the discontinuity in the current intPnsity course. The response current intensity is then the current intensity at the instant of the first discontinuity in the differentiated current intensity course.
In typical turn-on actions, the current intensity increases quickly. Eddy currents arise, which influence the functional relationship between force and current intensity. In order to correct this influence, in accordance with an added mode of the invention, there is provided a method which comprises decreasing the current intensity measured on the ~ to be tPsted by the eddy current intensity, which is a function o~
the current intensity and the variation over time of the current inten~ity.
The eddy current intensity can also include other leaXage current intensities. In accordance with an additional mode of the invention, there is provided a method which comprise~
determining the eddy current intensity by measuring not only the current intensity but, for instance, the variation in the current inten~ity as well. With the aid of a correction ~actor, the eddy current inten~ity can then be determined and thus the current inten~ity can be corrected.
2~62~33 With the correction, an advantage is attained which is that in a fast current intensity increase in the magnet, and even if the voltage deviates markedly from the rated voltage, the force on the moving parts of the ~4~, ancl in particular the response force, can be determined. If a high voltage i~
applied, the current intensity increase is in fact greater than when a low voltage is applied.
In order to determine the response force, the calibration function and the correction factor must be furnished. To this end, base measurements are necessary that precede the actual test and can, for instance, be carried out in a laboratory.
"
For instance, in accordance with yet another mode of the invention, there is provided a method which comprises ascer-taining the calibration function for a ~eneri¢ally identical or similar-type ~ by measurement of the forc~ acting upon an arrested magnet armature by means of a magnet, a~ a function o~ the current intensity in the magnet.
In accordance with yet a further mode of the invention, there is provided a method which comprises ascertaining th~ cali-bration function by arresting moving parts in a generically valve idenSical or ~imilar-type ~4~e~, for instance by mean~ o~ a iorce ~ ~, then applying an electrical voltage to the magnet and then slowly increasing the voltage, and i~ochronously recording the current intensity rising with the -- . ~
; ~62~33 voltage and the force generated by the magnet, and expressing the relationship between the force and the current intensity in the calibration function.
This calibration function makes it possible to determine the instantaneously exerted force for any measured current intensity value, if there are no eddy currents. Using the calibration function has the advantage that a simple measure-ment of current intensity suffices to determine the force, valveand in particular the response force of the ~
Since a ~e~e~ that is generally identical to the ~*e to be tested later is used to ascertain the calibration function, the calibration function can be used unrestrictedly. Howev-er, a separate calibration function must be picked up for each ~ type to be tested.
Since the moving parts of the fl~eff~ are arrested by a force absorber in order to ascertain the calibration function, the exerted force can be measured exactly. Force value~ are obtained not only for current intensity values below the response current intensity but also for higher current intensity value~.
For instance, in accordance with yet an added mode of the invention, there is provided a method which comprises ex-pressin~g the calibration function as a polynomial:
~06~3 ~
F = a ~ al I + a2 ' I' + ..- + anI
In this equation, F is the force of the magnet llpOn the moving parts, I is the current intensity in the magnet, and a is a polynomial coefficient. The calibration function found is well represented by a polynomial.
In order to correct the eddy current influences, the di~fer-ence between the measured current intensity It and the eddy current intensity Iw should also be inserted as the current intensity I in the polynomial of the calibration function, which represents the functional relationship between the valve force upon the moving parts of the ~, on one hand, and valve the current intensity in the magnet of the ~, on the other hand. Accordingly, as an eddy-current-corrected current intensity Ik, the following should be inserted for I:
Ik ~ I~ Iw It is known that the eddy current Iw is proportional to the measured current It and its variation over time, dIt/dt.
From this it can be concluded that Iw c It t/
where c is the correction ~actor.
., - ~625~3 From these last two equations, by mathematical conversion ~or the corrected current intensity Ik, it follows that, Ik It ' ( 1 - C ~ dIt/dt) ~
This equation for the corrected current intensity Ik is inserted into the calibration function. As a result, the calibration function which i5 corrected in terms of the eddy current is obtained, and continues to be in the form of a polynomial.
In accordance with yet an additional mode of the invention, valve there is provided a method which comprises testing a ~ by determining the correction factor c. To this end, first, in two ~t~p~, with two different constant voltages that are appl~ed to the magnet, the current intensity course, the course of the variation over time of the current intensity, and the course of the force at the turn-on action are deter-valve mined at the generically identical ~t4~ arrested with a : force ~ ~ . Accordingly, for each of the two voltage~
one current intensity course, one course of the current intensity variation and one ~orce course over time are obtained.
In the ensuing description it is assumed that ~or an equ~l force, the current intensity Ik that is corrected in terms o~
th~ eddy current must be the same. ~or a particular, identi cal force, the measured current intensities It~U1) an~ It(U23 2~62~33-and their variation (dIt/dt)U1 and (dIt/dt)U2 are therefor determined.
Since Ik(Ul) and Ik(U2) are equal, it follows that:
I~ (U~ C (dIt/dt)Ul) = It(U2) (1 - C (dIt/dt)U2)-For the correction factor, it follows that:
It (Ul ) - It (U2 ) (It dIt/dt)~ It dIt/dt)U2 The value found for the correction factor c should then be inserted into the equation for the corrected current intensi-ty Ik and thus into the calibration function.
With the aid of the calibration function, the associated force K can be determined merely from the measured current intensity It, and the response force KA can be determined merely from the response current intensity IA.
With the method of the invention, particularly with the xpanded correction proces5, an advantage is attained which valve is ~h~t~ reliable indicatlon of the condition o~ a ~e~e~ can be obtained solely with a simple measurement of current intensity.
_g_ 2~2S33 -With the objects of the invention in view, there is also provided, in an assembly of a ~ being driven by an electromagnet~ having a magnet armature and an electrical circuit, an apparatus for testing the ~ , comprising a current intensity meter in the electrical circuit of the magnet; a computer connected to the current intensity meter;
and a memory for a calibration function being connected to the computer for indicating a dependency of a force acting upon the magnet armature on a current intensity in the electrical circuit of the magnet.
In the computer, the meas~red current intensity is linkad to the memorized calibration function, so that a value for the force is present at the output of the computer. This value is compared for deviation with a command value, and if there is a deviation then a signal is output, for instance by a signal transmitter. The memory for the calibration function may also be a movable memory, such as a diskette.
In accordance with another feature of the invention, the computer is connected to a display apparatus, such as a screen or a plotter, which are capable of display:ing the course over time of the current intensity or the differenti-ated current intensity. Any discontinuity, such as a maxi-mum, ~hown on the display device, will be recognized by a person as a turn-on instant.
2~62~33 A cursor may be used for this purpose. The value of the current intensity at the turn-on instant is determined in the computer. The force at the turn-on instant (response force) is then calculated for thi~ turn-on current intensity.
The turn-on current intensity can also be autematically ascertained by a computer from the measured course of current intensity, without a person having to study the course of current intensity.
With the expanded apparatus, the force that acts upon moving par~s o-the ~ whenever the motion begins, is studied as a response force. This force provides an optimal indication as to the condition of the ~o~o~.
In accordance with a further feature of the invention, in order to correct the influence of an eddy current upon the measured current intensity, a subtractor is used, which is connected to the output side of the current intensity meter and as a rule is integrated with the computer. The associat-ed eddy current value i~ delivered to another input of the subtractor. In order to determine this eddy current value, the current intensity meter is connected to a computer to which a correction ~aator can also be supplied. The eddy current value i3 determined in the computer from this factor an~ ~rom the current lntensity value and the differentiated current intensity.
In accordance with an add0d feature of the invention, there is provided a calibration apparatus, disposed in a laborato-ry, for instance, to ascertain the necessary calibration function. It has a generically identical or similar-type , the ~oving parts of which, in particular its magne~
armature or closure element or blind, are arrested by a force ab~or~. The maqnet of the generically identical ~ ~ is connected to a variable voltage transmitter. A current intensity meter is located in the electrical circuit of the magnet. Otherwise the calibration apparatus is largely equivalent to thP apparatus that is used to test a ~u~.
Different voltages may be applied automatically or manually.
For each voltage value, a pair of values for current intensi-ty and force is then determined, and from the pairs of values the calibration function is formed in a correction element, which may be part of a compùter. Downstream of the correla-tion element is the aforementioned memory for the calibration function. The memory may be a tran~portable memory, such as a diskette.
In accordance with a concomitant feature of the invention, in meter ordar to determine the correction factors, the forcle ~nK~i~c~
is connected, E~r-~6~ c~directly, and the current intensi-valve ty meter of the a~orementioned generically identical ~e~e~ ls connected directly and through a differentiator, ~CU iFU~
to memories, in order to store in memory the current inten~i-ty courses, the courses of current intensity variation, and the courses of force at the turn-on action for two different, 2Q~2533 -~
... .....
constant voltages. The memories are connected to a selection and calculation unit for selecting the current intensities and current intensity variations for the two voltages at a constant force and for calculating the correction factor.
The differentiator, the memories and the selection and calculation unit may be part of a computer for determining the correction factor. Downstream of the selection and calculation unit or computer is a memory for the correction factor, for instance a transportable memory such as a disk-ette.
The correction factor can also be stored in memory on a data carrier for later use.
With the apparatus according to the invention for testing a -rotor driven by an electric magnet, an advantage is attained which is that once calibration has been done, only the current intensity course needs to be measured at the magnet.
Nevertheless, a reliable statement as to the force acting valve upon the moving parts of the~K~ at the instant that motion begins, is obtained. This force permits an unequivocal statement to be made as to the instantaneous condition o~ the v alve -~ot~, ..
Other features which are considered as characteristic for the invention are set forth ~n the appended claims.
-13- ~ ~
2062~33 Although the invention is illustrated and described herein a~
embodied in a method and an apparatus for testing a rotor, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The`construction and method of operation of the inv2ntion, however, together with additional objects an~ advantages thereof will be best understood from the following clescrip-tion of specific embodiments when read in connection with the accompanying drawings.
Fig. 1 is a graph sho~ing a course of a current intensity It valve at a magnet of a magnetically driven ~ in a turn-on action over a time t;
Fig. 2 includes a schematic circuit diagram of an apparatus for testing a ~re~ driven by an electric magnet and a valve diaqrammatic elevational view of the ~ and magnet; and Fig. 3 is a view simllar to Fig. 2 including a circuit diagram o~ a laboratory apparatus for furnishin~ a calibra-tion function and a correction factor.
Referring now to the figures of the drawing in detail and first, particularly, to Figs. 1 and 2 thereof, it is seen that if A voltage is applied to a magnet la of a magnet-driv-en = 2a as seen in Fig. 2, then the current intensity It in the electrical circuit of the magnet la initlally rises as shown in Fig. 1. Once the motion of moving parts~ for instance a magnet armature 3a or a closure element or blind 4a of the = 2a begins, the current intensity It drops briefly, or after some discontinuity rises less quickly than before. Subsequently, after a further discontinuity, the current intensity It again rises as before ~nd attains a constant value. In order to determine the so-called response current intensity IA, in other words the current intensity at valve the instant when the motion of the moving parts of the_~;
2a begins, it is sufficient to determine the first disconti-nuity or the maximum point in the current intensity course.
To this end, the current intensity course is differentiated, and then the first discontinuity or the zero crossover is determined there. A force KA exerted upon response of the 2a is determined from the response current intensity IA, with a calibration function KF. This gives an optimal valve indication as to the functional capability of the ~e~ 2a.
In order to d~termine the calibration function KF and a correction factor c, ~ Y~ 2b which is generically ldenti-cal or of the same type is used, in which moving parts, for in~tance a clo~ure element or blind 4b and a magnet armature meter 3b, are blocked by a ~orce d~Pbe~ or transducer 5, as seen in Fig. 3.
2~2~33 -A correction of the eddy eurrent influences may be performed, in order to improve the acc~lracy of the evaluation.
In Fig. 2, the apparatus for~ testing according to the invention has a current intensity meter 6a in the magnet~ -circuit of the ~ 2a to be tested. In order to correct the influences of eddy currents, the curreot intensity meter 6a is connected to one input of a subtractor 7, having ~ her input which receives an eddy current intensity value Iw. A
corrected current intensity Ik is present at the output of the subtractor 7. In order to determine the response curren~
intensity IA of the ~ 2a at which the motion of the 2a begins, an output of the subtractor 7 is connectecl to a selection unit 8. In the selection unit, a maximum point or a discontinuity of the current intensity course shown in Fig.
1 or of the differentiated current intensity course is determined. The response current intensity IA~ which is corrected in terms of the eddy current, is present at the output of the selection unit 8. The output of the selection unit 8 is connected to a computer 9, to which the calibration function KF can be supplied from a memory 10 shown in Fig. 3.
Instead of the selection unit 8, a screen or plotter unit may be u~ed, with the a~d of which a person can then make the selection of the response current intensity IA. The response rurrent intensity IA must then be read into the computer 9.
The response ~orce KA upon the moving parts, for inætance valve upon the closure element 4a of the ~Y~ 2a, corresponding to the response currenk intensity IA, is present at the output , .
20~2533 -`
of the computer ~. The output of the computer 9 is connect-ed, for instance, through a command value comparator 11, to a signal transmitter 12, for instance, which indicates a deviation of the force value from a command value and thus valve provides an indication as to the condition of the-~etor- 2a.
The subtractor 7, the selection unit 8 or a screen, the . .
computer 9, and so forth, can together form a higher-level computer.
In order to calculate the eddy current intensity Iw, the current intensity meter 6a is connected to a~ additional computer 14, which includes a differentiator and to which the correction factor c can be supplied. This computer 14 may be part of the higher-level computer.
As mentioned above, in Fi~. 3, the ~e~ 2b, which is generi-valve cally identical to or of the same type as the ~4~ 2a to be teste~, is used in the laboratory to determine the calibra-valve tion function KF. Again, in this generically identical ~Y~
2b, the moving part~, for inqtance the closure element 4b or meter the magnet armature 3b, are blocked by the force a~GerD~ 5.
A current intensity meter 6b and a variable voltage transmit-ter 16 ara located in the electrical c:ircuit ~f the magnet meter lb. Both the force ~t~4~ 5 and the current intensity meter 6b communicate with a correlation element 17, in which the calibration function KF is determined from measured pair~
of values for a force K and a current intensity I. Tha correlation element 17 i~ connected to the memory 10 ~or the 2~62533-`
calibration function KF. The correlation element 17 may be a computer.
In order to determine the correction factor c, which is necessary for determining the eddy current intensity Iw, the current intensity meter 6b and the force ~}~c~ 5 of the generically identical-ro~ 2b, which are already used for determining the calibration function KF, are connected to a laboratory computer 18. There, current intensity courses, differentiated current intensity courses, and force course~
are stored in memory for two different voltages U1 and U2 that are generated by the voltage transmitter 16. For a specific fixed force, two associated current intensities Iu and Iu2 are selected from the two current intensity courses.
Corr~sponding current intensity variations (dIt/dt)ul and (dI~/dt)u2 are selected from the two differentiated current intensity courses. The correction factor c, which is nece~-sary for the eddy current correction, is determined from these values. An output of the computer 18 is connected to a correction value memory lg. The computer 18 may include the correlation element 17. The computer 18 may have a screen or a plotter unit, with the aid of which a person can then read the values for the current intensity Iul and Iu2 and for the CUrrent inten~ity varlation ~dIt/dt)u1 and (dIt/dt)u2 off from curves. These values must then be entered into the computer 18. The laboratory computer 18 may be structurally valve identical to a computer that is u~ed in testing the iY~ 2a.
2~2533 With the method and with the apparatus shown for testing the 2a, it is advantageously possible, after determining the calibration function KF and the correction factor c, to xeliably and accurately determine the force KA exerted upon response of the ~4~U} 2a upon the moving parts, for instance the closure element 4a o the roto~ 2a, merely from the current intensity It in the electrical circuit of the magnet la, which can be measured by simple means. This response force KA permits an unequivocal statement to be made as to valve the condition of the dX~U~ 2a.
.. ........ .
Claims (16)
1. A method for testing a valve being driven by an electro-magnet having a magnet armature, which comprises:
determining a value of current intensity in the magnet as a response current intensity, at an instant when motion of the magnet armature of the valve begins during a switching action of the valve; and determining a force acting through the magnet upon the magnet armature from the determined response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the valve.
determining a value of current intensity in the magnet as a response current intensity, at an instant when motion of the magnet armature of the valve begins during a switching action of the valve; and determining a force acting through the magnet upon the magnet armature from the determined response current intensity, at the instant when motion of the magnet armature begins, by means of a calibration function, as a response force and as a standard for the condition of the valve.
2. The method according to claim 1, which comprises picking up a course of the current intensity at the magnet during a switching action of the valve, and determining the current intensity at a first discontinuity of the course of the current intensity, as the response current intensity.
3. The method according to claim 2, which comprises differ-entiating the course of the current intensity, and determin-ing the current intensity upon the first discontinuity of the differentiated course of the current intensity, as the response current intensity.
4. The method according to claim 1, which comprises correct ing an influence of an eddy current by decreasing the mea-sured current intensity by an eddy current intensity, being proportional to the measured current intensity and to the variation over time of the measured current intensity.
5. The method according to claim 4, which comprises deter-mining the eddy current intensity from the measured current intensity, a variation over time of the measured current intensity and a correction factor.
6. The method according to claim 1, which comprises ascer-taining the calibration function for another valve of the same type by measuring a force acting through another magnet upon an arrested other magnet armature, as a function of a current intensity in the other magnet.
7. The method according to claim 1, which comprises ascer-taining a calibration function for another valve the same type as the first-mentioned valve, by blocking a magnet armature of the other valve with a force meter; applying an electrical voltage to a magnet of the other valve increasing the electrical voltage; isochronously recording a current inten-sity of a current generated by the applied voltage and a force measured by the force meter; and determining the force in relation to the current, as the calibration func-tion.
8. The method according to claim 1, which comprises express-ing the calibration function as a polynomial.
9. The method according to claim 5, which comprises deter-mining the correction factor with another valve of the same type as the first-mentioned valve being blocked by a force meter by applying two different constant voltages in succession to a magnet of the other valve; and measuring the course of the current intensity, of the variation over time of the current intensity, and the course of a force with the force meter, upon each turn-on action; determining the instantaneous current intensities and the instantaneous current intensity variations over time, for both constant voltages for a force of equal magni-tude; and determining the correction factor from both pairs of values.
10. In an assembly of a valve being driven by an electromag-net having a magnet armature and an electrical circuit, an apparatus for testing the valve, comprising a current inten-sity meter in the electrical circuit of the magnet; a comput-er connected to said current intensity meter; and a memory for a calibration function being connected to said computer for indicating a dependency of a force acting upon the magnet armature on a current intensity in the electrical circuit of the magnet.
11. The apparatus according to claim 10, including a selec-tion unit connected between said current intensity meter and said computer for the current intensity value of a parameter selected from the group consisting of a discontinuity, a maximum point in the course of the current intensity or the differentiated current intensity.
12. The apparatus according to claim 11, including a differentiator element connected between said current inten-sity meter and said selection unit.
13. The apparatus according to claim 11, including a subtractor having two inputs and an output, one of said inputs being connected to said current intensity meter, an additional computer receiving a correction factor and having a differentiator element, said additional computer having an input connected to said current intensity meter and an output carrying a value for an eddy current being connected to the other of said inputs of said subtractor, and the output of said subtractor carrying a corrected current intensity and being connected to said selection unit, in order to correct the influence of the eddy current.
14. The apparatus according to claim 10, including another valve of the same type as the first-mentioned valve, another magnet driving said other rotor and having an electrical circuit, and another magnet armature of said other magnet; a force meter arresting said other magnet armature; a variable voltage transmitter connected to said other magnet;
another current intensity meter in the electrical circuit of said other magnet; a correlator for ascertaining the calibra-tion function, being connected to said force meter, to said other current intensity meter for forming a correlation function and to said memory for the calibration function.
another current intensity meter in the electrical circuit of said other magnet; a correlator for ascertaining the calibra-tion function, being connected to said force meter, to said other current intensity meter for forming a correlation function and to said memory for the calibration function.
15. The apparatus according to claim 13, including another valve of the same type as the first-mentioned valve, another magnet driving said other valve and having an electrical circuit, and another magnet armature of said other magnet; a force meter arresting said other magnet armature, a variable voltage transmitter connected to said other magnet;
another current intensity meter in the electrical circuit of said other magnet; a correlator for ascertaining the calibra-tion function, being connected to said force meter, to said other current intensity meter for forming a correlation function and to said memory for the calibration function.
another current intensity meter in the electrical circuit of said other magnet; a correlator for ascertaining the calibra-tion function, being connected to said force meter, to said other current intensity meter for forming a correlation function and to said memory for the calibration function.
16. The apparatus according to claim 15, including a labora-tory computer connected to said force meter and to said other current intensity meter, said laboratory computer having means for storing in memory the course of the current intensity, a current intensity variation and a force in a turn-on action for two different constant voltages, for a selection of two current intensities and two current intensi-ty variations for a constant force and for the two voltages, and for calculating the correction factor from the current intensities and the current intensity variations for two voltage values and for a constant force, said laboratory computer having an output, and a memory for the correction factor being connected to the output of said laboratory computer for furnishing the correction factor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4107813.6 | 1991-03-11 | ||
| DE4107813A DE4107813A1 (en) | 1991-03-11 | 1991-03-11 | METHOD AND DEVICE FOR TESTING A FITTING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2062533A1 true CA2062533A1 (en) | 1992-09-12 |
Family
ID=6427011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002062533A Abandoned CA2062533A1 (en) | 1991-03-11 | 1992-03-09 | Method and apparatus for testing a valve |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0508089B1 (en) |
| JP (1) | JPH05118959A (en) |
| AT (1) | ATE138740T1 (en) |
| CA (1) | CA2062533A1 (en) |
| CZ (1) | CZ283665B6 (en) |
| DE (2) | DE4107813A1 (en) |
| ES (1) | ES2087326T3 (en) |
| FI (1) | FI921053A (en) |
| RU (1) | RU2037896C1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4317109A1 (en) * | 1993-05-21 | 1994-11-24 | Herion Werke Kg | Method for checking solenoid valves and associated measuring arrangement |
| FR2745913B1 (en) * | 1996-03-11 | 1998-04-10 | Electricite De France | DEVICE AND METHOD FOR CONTROLLING A MECHANISM EQUIPPED WITH A PLUNGER CORE |
| NL1010634C2 (en) * | 1998-11-23 | 2000-05-24 | Kamstrup B V | Pressure source with constant relative increase in pressure and method for diagnosing over and / or underpressure safety valves. |
| KR100703977B1 (en) * | 2005-08-02 | 2007-04-06 | 삼성전자주식회사 | Valve test device and solenoid valve test method and venturi valve test method |
| US8823390B2 (en) * | 2011-06-15 | 2014-09-02 | Eaton Corporation | Solenoid-operated valve and method of monitoring same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE650025A (en) * | 1963-07-02 | |||
| US3988664A (en) * | 1975-02-18 | 1976-10-26 | Burroughs Corporation | System for predicting or detecting a fault in a solenoid utilization system |
| US4311961A (en) * | 1978-11-25 | 1982-01-19 | Lucas Industries Limited | Testing of enclosed electromagnetic relays |
| US4319193A (en) * | 1980-05-14 | 1982-03-09 | Northern Telecom Limited | Testing of relays and similar devices |
| DE3151757A1 (en) * | 1981-12-29 | 1983-07-07 | Siemens AG, 1000 Berlin und 8000 München | Method for testing an electromagnetic action device, particularly a relay with contact armatures encapsulated in an opaque housing, by representing and/or evaluating their armature movement and arrangement for carrying out the method |
| JPS58190778A (en) * | 1982-04-30 | 1983-11-07 | Matsushita Electric Works Ltd | Relay inspector |
| DE3708892C2 (en) * | 1987-03-19 | 1994-03-03 | Heidelberger Druckmasch Ag | Current measuring device, in particular for determining the motor current of a DC motor |
| DE3835677C2 (en) * | 1988-10-20 | 1997-07-17 | Metrawatt Gmbh Gossen | Measuring method and circuit arrangement for determining the tripping current of RCDs |
-
1991
- 1991-03-11 DE DE4107813A patent/DE4107813A1/en not_active Withdrawn
-
1992
- 1992-02-28 DE DE59206397T patent/DE59206397D1/en not_active Expired - Fee Related
- 1992-02-28 EP EP92103468A patent/EP0508089B1/en not_active Expired - Lifetime
- 1992-02-28 ES ES92103468T patent/ES2087326T3/en not_active Expired - Lifetime
- 1992-02-28 AT AT92103468T patent/ATE138740T1/en not_active IP Right Cessation
- 1992-03-09 CA CA002062533A patent/CA2062533A1/en not_active Abandoned
- 1992-03-09 JP JP4086494A patent/JPH05118959A/en not_active Withdrawn
- 1992-03-10 RU SU925011025A patent/RU2037896C1/en active
- 1992-03-11 FI FI921053A patent/FI921053A/en unknown
- 1992-03-11 CZ CS92733A patent/CZ283665B6/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0508089B1 (en) | 1996-05-29 |
| EP0508089A2 (en) | 1992-10-14 |
| ES2087326T3 (en) | 1996-07-16 |
| FI921053A0 (en) | 1992-03-11 |
| EP0508089A3 (en) | 1992-12-09 |
| CZ283665B6 (en) | 1998-05-13 |
| FI921053A (en) | 1992-09-12 |
| JPH05118959A (en) | 1993-05-14 |
| RU2037896C1 (en) | 1995-06-19 |
| DE59206397D1 (en) | 1996-07-04 |
| ATE138740T1 (en) | 1996-06-15 |
| CS73392A3 (en) | 1992-09-16 |
| DE4107813A1 (en) | 1992-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |