DE1500011C3 - Relieved needle valve for a free jet turbine - Google Patents

Description

Especially with self-closing valves, where

the needle closing force must always be greater than the 50 needle recoil force, results in the area of

The invention relates to a needle valve for a SchHeßstellung the N ^^ f ^ SJ Free jet turbine with an axially large m closing in the valve housing hibb l Abhlßdl d i i "^^" "ΪΙ

Free jet turbine with an im g

displaceably mounted pin and one in "^^." "ΪΙ ^

Ventilachsrichtung movable relief ring, wel- force that at large: n Nadeh ^

rather, two stop surfaces 53 can be compensated for by springs on one end face. Straight line: in

has, one of which is located in an end position of the needle that is close to the welding position of the needle

On dfe ⁿ Nad ^a ei a needle valve is known Endig force notw, without ^ _dj? Measures in the position by the needle head acting on the downstream-facing surface of the motor of the needle valve de ar ti ^ ohe pressure acting on the needle head, that the regulator de: necessary fine control

The needle is moved to the open position, as the leveling off of the needle push force increases

and needle closing force resulting force on a needle shaft S and from the guide sleeve 8

In a more complex manner and with a smaller space requirement, the annular space 11 stands over an annular gap 12

is enough. with the process water leading from the valve

In the case of a needle valve, this task is limited by the housing 1 and the guide sleeve 8

eangs mentioned type according to the invention thereby ge 5 annular space 13 in connection. The guide sleeve 8 is

Tost that in its middle area with your solid, valve-

a) the relief ring as provided between the needle and axially perpendicular partition 14, which the housing guided piston is formed, has a coaxial opening in which the needle

b) the end shaft 5 facing away from the stop surfaces is guided. Upstream of the interface of the piston with the upper water space io wall 14, the needle shaft carries one firmly with it of the housing, is in communication and connected, guided in the guide sleeve 8 KoI-

c) the end face facing the stop surfaces ben IS of a servomotor with the pressure chambers 16, of the piston with the environment of the needle valve 17, which is outwardly through the guide sleeve 8 and communicates. through the partition 14 or through the cover 7

The technical progress results from the to be limited to 15

would exist. From the pressure chamber 16, a channel 18 leads through

It is also advantageous if the needle has an upstream facing housing 1 through a known manner on guide sleeve 8, one of the webs iS and the valve face and opens into a compensation surface, not shown, which connects to the headwater pressure oil line, which to a not is in communication with the control chamber of the housing shown. A special slide 20 leads. From the pressure chamber 17, a channel leads through which uniform loading of the servomotor is also achieved through the guide sleeve 8, the web 6, so that the piston is divided into two or more and the valve housing 1 passes through and opens into partial pistons, one of which is a stop surface Pressure oil line, not shown, which leads to a control slide, not shown, in one end position of the needle on a counterpart. Likewise, the needle leads directly or indirectly via 25 from the pressure chamber 17 in the same way to a back another partial piston and its other guide rod 29 receiving channel 21 out of the valve stop surfaces in the same end position of the valve housing 1. The return rod 20 is in the del of opposing surfaces of the housing directly or in a known manner by an articulated on the cover 7, indirectly provided with rollers 22 by a conical bottom of the different, predetermined and fractions of the 3 piece 23 of the piston 15 actuated rocker arm 24 fill valve lifts have corresponding distances. moves away and reports the respective needle position

In the drawing are exemplary embodiments of the outside.

Subject of the invention shown in simplified form. It the upstream bounding the annular space 11

shows surface consists of two concentric, valve axis

F i g. 1 shows an axial longitudinal section through a vertical annular surface, the outer annular valve in the inlet line of a free jet turbine surface 25 from an upstream to the leg Closed position, sleeve 26 extending from partition 14

F i g. 2 an axial longitudinal section through the needle guide sleeve 8 is formed. The inner ring

Delventil according to the F i g. 1 in the open position and surface is the downstream facing surface 27 of a

F i g. 3 and 4 excerpts from longitudinal cuts for 4 ° between the needle shaft 5 and the sleeve 26 of the

further embodiments. Guide sleeve 8 arranged relief piston

Corresponding parts show in all figs. 28. This is the surface 27 of the relief piston

guren the same reference numerals. 28 smaller than that around the projection of the

That in Fig.! and2 needle valve shows the position of the needle3 from the process water.

a valve that continues the feed pipe (not shown) struck part of the surface 9 of the needle head 4

valve housing 1, which on its downstream reduced compensating surface 10.

NEN end carries a nozzle 2, the opening transverse The relief piston 28 is seen downstream

cut through a needle 3 with a needle head 4 hen in the area of the upper third of its axial

and a needle shaft S regulates or aogeschlos- expansion abpesetzt so that an annular,

will sen. The needle 3 is in an upstream direction coaxially to the valve axis perpendicular to the valve axis.

Gehäase 1 by means of struts 6 attached, upstream impact surface 29 results. The needle shaft 5 has a

upwards by means of a cover 7 closed guide narrow collar 30, whose downstream w & i-

rungs sleeve 8 mounted axially displaceable. The needle end, ring-shaped face perpendicular to the valve axis

head 4 has a downstream facing, which forms a counter surface 31. The surfaces 29, 31 form

adjustment or the closure of the opening transverse to the 55 movement of the relief piston

Section of the nozzle 2 serving surface 9 is provided. The upstream limit stop. The rifle

The needle shaft is of a smaller diameter than the 26 of the guide sleeve 8 is seen upstream

Needle head, so that an annular, ventilachs- is deposited a little in front of the partition 14, so that

vertical, upstream compensation surface is an annular, valve axis vertical, downstream

10 results. The nozzle 2 and the surface 9 of the 60 downward facing counter surface 32 are obtained. The upstream

The needle head is designed on the one hand and is the upward-pointing, annular, valve axis perpendicular

Size of the compensation surface 10 set so that in the end face of the relief piston 28 forms a

essential for all process water stop surface 33. The surfaces 32, 33 form one

Press, especially with normal process water - the movement of the relief piston upstream

pressure the needle closing force of the compensation surface 10 65 limiting stop. The surfaces 29,

is greater than the needle recoil force of the surface 9 31, 32, 33 so placed along the valve axis that in

of the needle head 4. Closed position of the needle 3, the surfaces 29, 31 of the

The stop associated with the needle 3 and located in the area of the needle head touch each other

1,500 Oil

5 6

and the surfaces 32, 33 of the guide sleeve 8 to the relief piston 28 now again over the

orderly stop by around 15% of the valve hub contacting surfaces 29, 31 as a relief force

. bes are distant from each other. also acts on the needle 3.

The relief piston 28 has at its current- In the within the range of 0 to 15%

downstream end seals 34 on. From the 5 opening located idle area enables the

downstream of the intermediate wall 14, after extremely low control opening force to be used

inside of the needle shaft 5 or from the relief piston the necessary fine control of the needle 3, and the

ben 28 and to the outside of the bushing 26 of the control opening to be used in the normal load range

rungshülse8 limited annular space 35 leads to a Ka- kung force is greater than in the idle range,

channel 36 in the same way as channels 18, 19, 20 10 but small enough that adequate control

out of the valve housing 1. In which the needle is possible.

shaft 5 leading opening of the partition wall 14 is the needle valve is under service water inlet

a self-closing pressure chamber 16 against the annular chamber 35 and of short overall length,

sealing seal 37 is provided. To control it are portable in the load range

The needle valve shown works as follows: 15 and extremely low control forces in the idle range

To open the needle valve it is necessary to use the channel, which is the necessary fine control

18 entered pressure oil into the pressure chamber 16, even with high operating water pressure and large

the servomotor piston 15 moves upstream allows the beam cross-section. So there is no

and takes the needle 3 with it. There is also a risk of damage to the needle head and the

the collar 30 of the needle shaft 5 with, and that with ao nozzle.

its stop surface 29 on the mating surface 31, there can be two or more such relief lying Relief piston 28 follows to be arranged under operating piston.

water action of the movement of the needle upstream. 3 is the needle valve

towards. After moving about 15% of the valve relief piston into three sub-pistons 28 '", 28", 28'

stroke, the stop surface 33 of the discharge »5 is subdivided. In the shown closed position of the

Stungskolbens 28 on the mating surface 32 of the bushing del 3 touches the stop surface 29 of the piston part

26 of the guide sleeve 8, and the stop formed by these surfaces 28 '", the gate surface 31 of the needle 3, and the stops 32, 33 prevents a further hit surface 33' of the piston part 28 'from moving the relief piston 28 upstream If the needle 3 is moved further upstream, the opposite surface 31 of the needle 3 moves away from the guide sleeve 8 by an amount corresponding to the valve lift stationary decision _w AERTS proximal end a collar 3 · '' with a 28 lastungskolbens downstream facing counter surface 31 '', which

The via the annular gap 12 with the service water with an upstream stop

ser in the annular space 13 communicating operating water 35 surface 29 ″ of the in the corresponding axial area

water in the annular space 11, which, in addition to the compensating surface, touches the offset partial piston 28 ″. The partial piston

10 at the same time the downstream end face 28 ″ has at its upstream end

27 of the relief piston 28 is applied, causes a collar 30 ″ with a downstream an upstream force of the relief counter surface 31 ″, which interacts with an upstream piston 28. In the area of 0 to 15 ° / o opening 4 ° downwardly facing stop surface 29 'of the counter-acted apart from the constant needle closing force, a corresponding axial area offset partial piston 28 ' low needle recoil force as well as about the touches at the upstream end of the touching surfaces 29, 31 - as in FIG. 1 shown partial piston 28 "located stop surface 33" is around represents - the force of the venting piston 28 as a load force making up about 40% of the valve stroke onto the needle 3, with a counter surface 32 ″ of the guide sleeve 8 Salting removed from these acting on the needle 3, this counter surface 32 ″ as continuation forces a slight in the closing sense acting tongue of the mating surface 32 in the direction against the Ven force results, which is designed to have an equally small extension axis. The one on the upstream turn Control opening force corresponds. Stop of located in the area of the end of the partial piston 28 '" 15 to 100 · / · opening, on the other hand, the force 50 acts as a surface 33 '"is a continuation of the stop surface 29 of the relief piston 28 is no longer formed on the Na- in the direction away from the valve axis del 3 a, but is about the touching This stop surface 33 '' 'is about 60% Areas 32, 33 - as in FIG. 2 - from the amount of a geder that makes up the ventilator stroke Fühnmgshülse 8 added, so that only the geafläche 32 '' 'of the guide sleeve 8 removed, wherein Needle closing force and against the open position 55 this opposing surface 32 '"as a continuation of the opposing direction increasing needle recoil force acting on the needle 3 surface 32 "in the direction against the valve axis, whereby in the open position the needle lock is formed.

by virtue of still mn reaping small question is greater than with the locking point shown in the drawing

the needle recoil force long of the needle 3 prevents the through the surfaces

To scfafießen the needle valve whd pressure oil from 60 29 ", 31" * formed a movement of the stop

the pressure chamber 16 drained, whereupon the Na- Teflkolbeos 28 "upstream, and through the

The 3 nnter Betriebswsetetnwirtamg against the surfaces 29 ', 31 "bathed stop prevents a

SchBeßsteflung moved towards. Acting in the area of movement of the Tefl piston 28 'upstream. In the

from 100 to 15 "/" opening the needle closing force so they all touch the closing position of the needle

and the reducing force of the needle back on the nose of the stops associated with the needle,

del 3 a, while in the range from 15 to 0 ° / «open- namely the surfaces 29, 31 and 29", 31 ^OT end 29 ',

tion previously about the touching surfaces 31 ″.

32.33 force absorbed by the guide sleeve 8 If the needle is moved in the open position, the follow

1 500 Oil Ό

7 8

Partial piston 28 '", 2 \\", 28' under process water - an annular space 42 is recessed, the upstream action of the movement of the collar 30 is limited upstream by a counter surface 31 ". Downstream. First, the stop surface 33 'touches the downward Annular space 42 delimits the counter surface 32 of the guide surface 43 by a stop partial piston 28 '. The partial piston 28' has a sleeve 8, the surfaces 29 ', 31 "move away from each other, and inner collar 44 of smaller axial extent the force exerted by the process water on the partial piston as the annular space 42, in which the annular space 42 ben 28 'no longer acts as a discharge collar 44 and in which it acts axially moving force on the needle 3, but is borrowed from the. The upstream end face of the guide sleeve 8 is excluded. With further movement federal 44 an upstream angulation of the needle 3 acts upstream through the impact surface 29 ', which in the illustrated locks'tel operating water on the piston part 28 "and then development of the needle 3 the counter surface 31" of the part piston The force exerted on the partial piston 28 '"does not touch ben 28", whereby the stop formed by this surface 29', more than a relief force on the needle 3, but 31 ", a movement of the partial plunger is absorbed by the guide sleeve 8, ben 28 The end face of the collar 44, which is located downstream only under the action of the bearing 15, forms an upstream water on the surface of the needle head 4 and downwardly pointing counter surface 45, which sees the compensation surface 10 from the striking surface 43 of the piston part 28 ″ by approximately

When the needle 3 is moved against the closed position, 25 ° β of the valve lift is removed

the first that is formed by the surfaces 29, 31 takes away.

dete stop the partial piston 28 '"downstream ao If the needle 3 from the closed position into the open

with, with the surfaces 32 '' ', 33' '' moving from one another, the sub-pistons also move

remove and again a relief force of the part 28 ", 28 'under the action of water upstream-

piston 28 '"on di>: needle 3 acts, which forwards until the stop surface 33' of the partial piston 28 '

gang touches during a lingering movement of the needle 3 in the mating surface 32 of the guide sleeve 8 and

Closing position initially with the partial piston 28 '25 which is transferred to the partial piston 28' by the process water

and then repeated with the partial piston 28 '. exerted force no longer acts as an unloading force

In this needle valve with three-part discharge, the needle 3 acts, but from the guide piston are the tips of the sleeve 8 to be used. With another movement control opening force very considerably reduced. When needle 3 moves upstream it touches the Andes according to the illustration defined action surface 43 of the piston part 28 ″, which is under areas the partial piston takes place in the range from 0 to the action of tap water of the movement of the needle 3 60% of the needle opening is followed by a control with the counter surface 45 of the piston section 28 ', and chener control power. Depending on the intended use, the process water on the partial piston 28 " of the needle valves can the areas of action of the exerted force no longer acts as a relief sub-piston even more against the open position of the needle 35 force on the needle 3, but is about the Teilhin relocated and thus the control force peaks still piston 28 'taken from the guide sleeve 8, be lowered more. whereupon the needle 3 only under the action of the

In the case of the process water in Fig. 4 in the closed position of the needle 3 on the surface 9 of the needle head 4 The needle valve shown is the relief piston in and on the compensation surface 10. In the open two Sub-piston 28 ″, 28 '. In this case, the needle is in the position where all the on-sub-pistons are in contact 28 ″ to enable the contact surfaces of the structure associated with the guide sleeve 8 of the needle valve from two parts 38, 39, the th stops, namely the surfaces 32, 33 'and 43, by a threaded connection 40 with a connection 45.

impact 41 are screwed together. When moving the needle 3 into the closed position

showed the closed position of the needle 3 touch each other 45 takes the one formed by the surfaces 29, 31 first

Stop surface 29 of the piston part 28 ″ and the stop with the piston part 28 ″, with the

opposite surface 31 of the needle 3, which surfaces 29, 31 surfaces 43, 45 away from each other and again

one the movement of the partial piston 28 "upstream - a relief force of the partial piston 28" on the

downward preventive stop, and the needle 3 acts, whereupon the surfaces 29,

The impact surface 33 'of the partial piston 28' is to touch 50 31 'and the surfaces 32, 33' from each other remove about 20 ⁰ Ze of the valve stroke and again a stressing force of the TeS-from the counter surface 32 of the guide sleeve sent-piston IX over the Partial piston 28 ″ on needle 3 acts on the outer circumference of partial piston 28 ″

1 sheet of drawings

Claims (3)

Mender opening in each case an ever larger part of the patent claim downstream facing surface of the needle head in claim .. ^ VentflgpnSuse ^ thus in the area of action 1. Needle valve for a free jet turbine with the pressurized process water there geeiner in the valve housing so that it can be axially displaced. We * .iriirir «tnRkraf» gerten pin and a valve axis- It is known ^ Ae, «r NJd * udattBtaft direction movable relief ring which ^^^^ S ^ W ^^ L ^ L on one end face two stop surfaces close together cgcuiu ^ u. has, one of which is in an end position of the sewer behind the needle head ^ ur extraction; one stxom- del sits on the opposite surface of the needle and " ^^^ B ^^^^ S SSE Ä demonstrative surface of the needle is operating with a Predetermined fraction of the full valve ^ f ^^ Selsc ^ ß ^ U in each needle Stel-ATSSSiT ^'r> 5 lun anSnÄ: _rt equal, is selected from Nadelriickstoß- eTSSSiTt dr> 5 lun? anSnÄ: _{rt is the} same, is the as ennzeicnnet, AAII _KRA f _t and needle closing force resulting the aufzu- the relief as between the needle ^{crane unQ} r * <* ueisiju «= u». ,,.! "," F-ii- (3) and the housing (1) guided piston turning control force corresponding force ^ also s i28) auseebüdet is dependent ^{on the} needle position. The compensation b) dk J ^^ h * Mchen (29, 33) surface can be determined as Λ * , I the turned face (27) of the piston with *> needle recoil force and the needle closing force in the upper water space (13) of the housing in a single Najlsttltog * e Wm ^ hrite ^ but there is a connection and in this way the maximum values of the Naveroinaung siem una del recoil force and needle closing force can result. c) the frontal edges facing the stop surfaces> iuoM «i ^U11U · ropes of the piston with the environment of the corresponding to the control force to be applied Needle valve is connected * 5 force can be reduced by no more than half 2. Needle valve according to claim 1, characterized in that. "U, ·", ι non mn indicates that the needle (3) is in itself It is from the German Auslegesctmft 1 080 939 known way an upstream pointing known to compensate for the maximum values of the sliding surface (10), which with the upper needle recoil force and Nadelschheßkraft resulting.ewasserraum (13) of the housing (1) in connection 3o generating forces to provide a spring. D.e spring , ^{vw ö} presses on two movable in valve axis 3. Needle valve according to claim 1, characterized by relief rings. Each relief ring points to the indicates that the piston (28) in two or one Stirnse.te two, stop surfaces, one of which more sub-piston (28 ', 28 ", 28'") is subdivided, in one end position of the needle on an opposite one a stop surface (29, 29 ', 29 ") is seated in the surface of the needle and the other in the an end position of the needle (3) on an opposite end position of the needle from an opposite surface (31, 31 ', 31 ") of the needle directly or surface of the housing a predetermined one indirectly via another partial piston (28 ', Fraction 1 of the full valve stroke corresponding to Ab-28 ") and whose other stop surface has stood. .... (33 ', 33 ", 33'", 43) in the same end position 4o The use of a spring to compensate for the of the needle from mating surfaces (32, 32 ', 32 ", 32'", from needle recoil force and needle closing force resul-45) of the housing (1) directly or indirectly animal forces is only in the restricted Umüber Another partial piston (28 ') can be caught from one another, since such springs are different for large needles and fractions of a full valve valve would become intolerable hubs are spaced accordingly. 45 or the large forces occurring only partially could absorb. In addition, such springs are expensive.