US1041478A - Combined throttle and emergency valve. - Google Patents

Description

vv. JUHNSON.

COMBINED THROTTLE AND EMERGENCY VALVE.

' APPLICATION FILED JAN. 22, 1912.

1,041,478, Patented 001:. 15, 1912.

4 SHEETSSHEBT l.

' v Im/enhor; Werner" W. JOHNSON.

COMBINED THROTTLE AND EMERGENCY VAL'VE.

APPLICATION FILED JAN.22.1912.

1,041,478. Patented Oct. 15, 1912 4 SHEETS-SHEET 2v I Inventor;

Werner Joh nsom W. JOHNSON.

COMBINED THROTTLE AND EMERGENCY VALVE.

APPLICATION FILED JAN. 22,1912.

Patented Oct. 15, 1912.

4 SHBETSSHEET s.

Witnesses;

, l .l lau h I W. JOHNSON.

COMBINED THROTTLE AND EMERGENCY VALVE.

APPLICATION FILED JAN.22,1912. 1,041,478: Patented Oct. 15, 1912.

4 SHEBTSSHBBT 4.

view otthe valve actuatin COMBINED THROTTLE AND EMERGENCY .VALVE .r aitiieaa sortie T 's Ar WERNER JOHNS01\T; OF LYNN, MASSACHUSETTS; nssxenon TO COMPANY, A CORPORATION on NEW YORK.

Specification of Letters Patent.

X ut

GENERAL Emmet a Manama.iamie;

Application filed January 22, 1912. Serial No. 672,614. v

To all whom it may concern:

Be it known that I, VVERNER JOHNSON, a citizen of the United States, residing at Lynn, county of Essex, State of Massachu- 5 sett-s, have invented certain new and useful Improvements in- Combined Throttle and Emergency v alves of which the following is a specification... I

The present invention relatesfito valves which are employed to control the admission of steam or movers.

M0 re specifically the invention relates to-a valve that can be opened and closed y a hand wheelin the'ordinary manner and Which from any one or" its positions other elastic fiuidto prime can be closed suddenly, as for example by a speed governor driven by the prime mover receiving motive fluid through said valve.

The invention has for its'object to improve the construction of suchvalveswhere by they are rendered more certain and reliable in their action, the parts of the valve mechanism being of a simple, reliable character, readily manufactured and not liable to get out of order. s For a consideration of what I believe to be novel and myinvention, attention is directed to the accompanying description and the claims appended thereto. In the accompanying drawings is illustrated one of the embodiments of 'my invention, Wherein- Figure 1 shows a valve mechanism with a tripping In'canswhich is operated by a speed responsive device; Fig. 2 is an axial section showing the internal mechanism of the valve;

taken on line H ,of'Fig. 2; Fig. 5 is a and its actuating Fig. 3 is a plan' View of the valve with a portion ofit broken away; Fig. 4 is across-section of the valvecrcss-section taken; on the line 5-5 of Fig.

5 2; Fig. 6 is a cross-section taken on the line 6-6 cf Fig. 2; Fig. 7 is asection taken on the line 7-7 of Fig.

2; F ig. illustrates the positiqn, ofth'e vvalve actuating nut when the valve is in closed position, saidvalve having been operated by hand; Fig. 9 is a the valve in closed ing been closed by crating mechanism Fig. '11 is an isometric" I an isometric viewqoztrzthti rollers g nut; Fig. l2is a maits by means :of projections 11 trunnion member to which theyfare coii nected; Fig. 13 is a partial axialfsegition H taken through the nut and meant/sensing weight, said figure showingthe a'lve ,inf closed position and the relation between'ithe weight and the nut when in 'tlja'tpo ititiiij, *ig. 14 is a similar view showing' the 'valvev closing weight in the same position Fig. 13, but with the nut in itsupp'ei positime, this actionbeing 'ac complished byr61 5 tating the hand wheel with the valve omits seat; and Fig. 15 is a view illustrating the qresetting of the actuating nut and its I. leasing means. a

Referring to Fig. 1, A indicates a. portionjg of a turbine to which steam is adinittedibv the conduit B containing my ,impr'oved valve. G'indicates a governor shaft drivn by; the main turbine shaft through suitable pgearing. On the shaft is anv emergency governor comprising for examplela coiled-5 spring D whose free i when the speed becomes too great and strikes the trigger E. This trigger normally holds. 0 the latch F which in turn prevents the valve closing Weight from falling as Will-appearaater.

emergency closing of the valveis controlled by the trigger E and that it forms the ,prin;- cipal means for holding up the weight.: It is also to be notedthat it has no connection: with the hand wheel so that the valve may.. be suddenly and auton'iatically closed from any of its positions even thoughthebopere 90 atorbe in the act of moving ithyhand.

vided with a partition 6. Fig. 2. Formedin. the, partition 6 is a valveseat .7, ;;S;ecnred to the valve casing 5 is a: split yoke S. which 1 is adapted to receive the valve operating mechanism. The yoke ismade in a single" piece and is bored transversely to receive 1.

a trunnion carrying member, andalso longi-u neck tt e y "weighty e valve 10 decl in its vertical moveis gui end moves outwardly .It is to be noted that automaticora- A it 5 indicates a valve casing which ispro- A tudinally forming a tubular end to"receive ,100

anotherormed on the main valve.

located at its top and bottom ends. Extendi struction in addition to-transmitting movei i the annular V groove ments of the spindle to, the valve serves as an auxiliary valve for admitting high pressure fluid to the under side of the main valve for the purpose of balancing it during the opening operation. Without such an arrangement an excessive amount of power might be required to operate it if there was a heavy pressure on the upper side of the valve. When open the valve is substantially balanced but has a slight tendency to close due to, the unbalanced area of the spindle and to the weight of the parts.-

The lower portion 20 of the valve 10 is annular in formation and cooperates with closing to-prevent it frompounding. This is due to the fact that steam is trapped in the spacebetween the parts 20 and 21. By the time the steammovementot the valve and prevents it from striking Such action is of"irn portance when'the valve is suddenly closed.

the valve casing.

v Machined on the spindle 15 is a threaded portion 26 which cooperates with the longi: tudinally movable or sliding nut 27 Figs. 2 and 11. .Cast.'with the nut 27 are rectangular projections 28, F igs. 6'and11,

which are located in the longitudinal slots 29 formed between the legs or parts of the yoke 8. These projections are for the purpose of preventing the nut 27 fromturning while permitting it to move axially. I By this construction it is evident that thenut movement up or down has only alvertical As this nut plays an as the case may be.

important part in the operation of the valve,

. further de'scnption .thereof will be given hereinafter. e I Formed on the cap 1710f the .valve spindle,

- Fig. 2, is a flan e 30 which acts against the shoulder 31 of. thevalVe-1O. Hence any;

upward movement of the spindle 15 will lift the valve due to this flange and shoulder construction. Downward movement of the spindle 15 causes the nut 18 to come in contact with the surface 32 of the main valve,

by forcing it to move downwardly.

bore in the yoke 8 1s a Mounted in a 35, Figs. 2 and 5, which 1ever parts 21 when the valve is position 2 has escaped from the sleeves member 20,the valve is "seated. In'oth'er' words these members have a da'shf'pot area which retards the downward Fig. The weight 49 then water of condensation which accumulates in iscylindrical in cross-section and is held in positionby means of bolts 36, as shown in' Fig. 5. 'As before stated, the yoke8 is split longitudinally. In other words it comprises two legs that are united at their upper ends. By placing the trunnion member 35 as shown and clamping it by the bolts 36 the legs of the yoke are firmly held in 'position. By making the outer surface of said member round the machine operations are simplified, and owing to its shape; it is securely anchored against axial movement.

Centrally drilled in the member 35 is'a hole through which the spindle 1'5 and nut27 extend. Formed on opposite sides of the member are cylindrical projections or pivots 37 and 38 on which is fulcrumed a lever comprising parts .39 and 4Q in position by means of nuts. Cast with the 39 an d l0 are hooks 41 and 12, Figs. 1, 2 and 9.- Connected to the levers 39 and 10 is a pin' 45 held in position by means of nuts. Mounted on the pin 45 is an eye Q6,Figs. 1,. 2 andlO, which is threaded to the rod 3,- said eyebeing held in a central 17 Under normal conditions the levers 39, 40, hooks 41, 42 andassociatedparts are held in position by meansof the latch F controlled by the trigger E, Fig. 1.

Underconditions'of excessive s eed the free on the pin 45 by means of spacing whichare held end of the emergency governor moves outwardly due to centrifugal .force therebv cansing the trigger E-to release the latch F. causes'the hooks 41 and around from under the anti- 12 "to swing I 50' and 51 until-checked by friction rollers the stop .52, as shown in Fig. 9. Cast withthe levers and hooksiare arms 53 and 54 which are so constructed and arranged in ,relation to the hooks that the rollers in their upward travel -(the resetting. operation) come in contact with said arms and cause the hooksto swing bank under the rollers. When this is done, the tripping mechanism is reset and the valve members are held in their normal position.

v The trunnion member 60'is secured tothe I upwardly extending tubular sleeve of the weight 60 and 1Q,-=and carries the rollers 50 and 51. It is alsoprovided with rectangular portions that engage the'slots or guides 29 in the yoke. have shown the trunnion member separfthfrom the' neck of the weight to which it 'is attached for convenience in manufacture. ,The eflect wouldbe the same if these parts were integral. Hence from one point of view on the weight. Looking at; it in another way, the weight forms the lower stop or.

support for the nut and when it is released the nut is permitted to slide downward.

carrying with it the valve spindle and the valve. S ecuredtojthe lower extremity of by mea ns of screws 61, Figs. 7.

the sliding nut 27 is seated mthe' purpose of operating the valve.

.gwhich go and externally tribu'ted as to permit of big the valve. By

" valve in the open position, g -Lhand-WheeI 63 and spindle 15 are rotated in I, thereo socause the valfveto move downwardly, the

has the spindle 15 in any intermediate 3 stance to'the packin shoulder 64 "which 6o member which acts as serves as an auxiliary valve motive fluid tocirculate inside the valve and the valve spindle 15 is a handwheel' 63 for I10- cated on the spindle 15 between the hand wheel 63 and nut 27 is a sleeve 65, Fig. 2. serves as a stop. for the downward movement of thenut- 27 under certain con- :ditions which will be referred to later in describing theoperation of the valve. Weight is'guidedint'ernally by the spindle by the downwardly project- ]1ng'pa rt of the yoke. The arrangement of the weight and ootiperating parts has the advantage of making a ver compact structure with the mass of the weight so disa relatively small external diameter. It will be noted that the "weight 60 whenin its suspended position acts as a support for the sliding nut 27 and siphon released as an agent for suddenly closreason of this arrange- 1 :{nent I am able to utilize the weight for two ipurposes whereas-zit has been only utilized for-one heretofore.

'Referring'to Fig. 2 which illustrates the to close it the a clockwise direction. 'The slightly unbalanced ressureon the valve and the weight and-that of its associated parts,

;nut 27 resting; on the trunnion member 60 and hence on the weight 60; This movement continues until the main valve 10 rests on its seat 7. Further, rotary movement of in the same direction causes the Hill? .27 to move upwardly until it strikes a shoulder or stopfi l formed on the yoke 8. This stops the upward movement of the nut .and as the spindle 15 continues to be rotated eelit pauses the spindle to move downwardly through the nut the valve to be seat. 4 If for any reason the valve should stick position, due for inbeing too tight or dirt ..-eoll ecting on the va ve spindleor seat, the olockwise'rotation of the spindle lli will oa-use'the nut to move upwardly against the stops its upward move- 3, ntent and further rotation of the spindle in the nut causes the valve 10 to be pulled by a slight amount, causing firmly pressed against its downward until it is closed. Assuming the valve is closed, to open it to the handwheel 63 is rotated in the oppoaiter or anti-clockwise direction which first eauses the nut to move downwardly into the p0S1tlOn shown in dotted lines, Fig. 8, a, until it comes in contact with the trunnion the lower stop. Further rotation oft'he spindle causes the said spindle to move upwardly through the nut, thereby raising; thejoap 17. y This cap and permits the The weight of the substantially balances it as to fluid pressures. The valve now being in a state of balance the operator can open itwith ease by rotating the handivheela If the valve was not balanced itwould necessitate an excessive amount of power to operate it as will readily be understood. l a

As the spindle 15 moves upwardly, it carries with it the sleeve 65 which serves as a stop for the valve and spindle! To better understand the stopping feature; the nut will first be considered at re'stfAny pressure or weight against the nut is in the direction and is taken up by the a downward trunnion member 60. As the spindle is 1'0 tated the action of the thread in the nut 27 causes the spindle to move upwardly, the

nut and the trunnion member (50 which is held in position by the hooks 41 and 42. As the sleeve 65 moves with the spindle, it is evident under these conditions that its move ment will be upwarduntil it comes in conparts being taken .up by said tact with the nut 27 Which prevents further movement of the spindle and valve. This sleeve is of such dimensions as to 'perinitthe valve to have a proper openiugjon the one hand and not to strike the casing on the other.

The operation of the valve under emergency conditions will/now be considered. Excessive speed causes the speed responsive device I) to move outwardly due to centrifugal force, this nioveinent releasing the trigger E and the latch F. controlled thereby and by means of the weight 49, the hooks 41 and -12- are forced outwardly from under the rollers 51 and 52, which allows the main weight 60 to drop and deliver a blow to the hub of the handwheelrfil. This blow forces the wheel 63, spindle 15,.nut 27 and valve 10 into the positionshown in Figs. 9 and 13, thereby closing the valve. The next operation, is to reset the valve actuating mechanism. The hand-wheel 63 is rotated in the valve-closing direction which causes the nut 27 to travel upwardly until it strikes the shoulder or stop 64, as shown. in Fig. '14-. Thus far the position of the valve is not affected. The weight is then lifted by hand until the rollers 5lr and- 52 pass by the hooks 41 and 42 and Contact w th the projections or arms 53 and 54. Further upward move- 'ment of the rollers causosthe projections 53,

54: and levers 39, 40 to swing about the pivots 37, and the weight 4'!) to move upwardly, thereby bringing the hooks ll and 42 into the path of the rollers 50 and 51, when they are lowered, as shown in Fig. LC. This movement also forces the rod 3, leading to the governor, ,lfig. l, downwardly, thereby resetting thetrigger E and latch F and cooperating parts. v The space or lost motion between the nut 27 and the trunnion member 60, Fig. 15, is

for the purpose of allowing excess movement of the members in the resetting opera.-

tion, thereby insuring the proper latching i shoulder or stop 64 on one side andthe trunnion member 60 on the other.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the apparatus which I now consider to' represent the best embodiment thereof; but I-desire to have it understood that the apparatus shown is only illustrative, and that the-invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In combination, a valve, a casing there-. for, a spindle-and movable nut for opening and. closing the valve ;under normal conditions, a weight that acts as a'support for tlfe'"nut during normal operation of the valve and which actuates the valve when itis desired to move it suddenly, and means .tjoi'holding the weight,

2."In; combination, a valve, a casing therefor, a spindle and sliding nut for opening and closing the valve under normal conditions a suspended-weight that acts as a.sup-

port for the nut during normal operation of the valve and which actuates the valve when it is desired to move it suddenly, and means for releasing the weight and permitting it to fall and the nut to slide 3.111 a valve of the character described, the combination of a valve, a casing therefor, a sliding nut, a valve actuating spindle cotiperating with the nut, a member upon which the nut normally rests, means which support said member, and mechanism for releasing said means to cause the valve to close suddenly.

4. Ina valve of the character described, the combination of a valve, a casing therefor,-a sliding nut, a valve operating spindle coiiperating therewith, a weight which when in its raised position forms a support for the nut, means for sustaining the weight, and means for releasing the weight to per mit it to move the valve.

5. In a valve of the character described, the combination of a valve, a casing therefor, a yoke carried by the casin that forms a guide, a nut guided by the yo e, stops be tween which the nut moves with a limited amountfof lost motion, means for moving one of the stopsto permit the nut to slide and close the valve, and a valve actuating spindle that coiiperates with the nut.

1 6. In a valve of the character described,-

the combination of a valve, a casing therefor, a split yoke carried by the casing, a pivot that is supported by the yoke and forms a means for connecting the parts thereof, a lever carried by the pivot, a weight that is sustained in position by the lever, a nut supported by the lever, and a. valve actuating spindle that cotiperates wit the nut.

7. In a valve of the character described, the combination of a valve, a casing there-- for, a sliding nut, a valve actuating spindle that cooperates with the nut, a weight having a tubular neck that surrounds the spin die, means attached to the neck for 'suppo'rting the weight, said means also acting as a seat for the nut, a lever havin h 0'k's.- that engage said means, and race anislllzt which normally holds the saidmeans but releases it under emergency conditionsi 8. In a valve of the character described, the combination of a valve, acasing there for, a sliding nut, a valve actuating'spindle that cooperates with the nut, a weight having a tubular neck that surrounds: the spindle, means attached to the neck for sup porting the weight, said means also acting as a seat for the nut, a lever having hooksthat engage said means, a yoke that is at-' tached to the casing and supports the lever, and a speed governor that releases the lever and hooks under certain conditions.

9. In a valve of the character described, the combination of a valve, a casing therefor, a sliding nut, avail/e spindle co'ciperat-ing with the nut, stops between which the nut moves, a'yoke attached to the casing that carries one of the stops, a means WhlClllCZlI- riesthe second stop, a device carried by the yoke which normally holds said means, and j mechanism' for releasing the secondstop and permitting the nut and spindle to slide in a direction to seat the valve. I 10. In a valve of the character described,

the combination of a valve, a casing there-' for, a Sliding nut, 'a valve spindle coiiperating with the nut, a split yoke carried by the casing which has a tubular end, a

weight having a neck that surrounds the spindle and is guided internally by the spindle and externally by the/tubular end of the yoke, said'neck forming a seat for the nut,

and means for sustaining the weight in its normal position and releasing it under emergency condltions.

11. In a valve of the character described,

for, a sliding nut, a valve spindle coiiperating with the nut, a split yoke carried by yoke, a lever and hooks supported by the pivot, a weight, a member attached tothe weight having trunnions that engage the hooks, said member also forming a seat for .the nut, and means which normally serve to .the combination of a valve, a casing there- With'the nut, a hand wheel hold the hooks in engagement With the trunnions and release them when it is desired to close the valve suddenly.

12. In a valve of the character described, the combination of a valve, a cas'ingftherefor, a sliding nut which is normally confined but has a certain limited amount of axial movement, a valve spindle that cooperates for opening and closing the valve by' hand, a suspended weight which when released closes the valve suddenly,

the valve sud- Wheel therefor, a stop Which moves with the a means for rele spindle and engages the nut when the valve is fully open to prevent further travel, and 'asing, the nut to permit the valve to close suddenly.

14; In combination, a main valve, a cassaid Weight forming a seat for o the nut, and means for releasing the weight ing therefor, a spindle on which said valve is loosely mounted, a means that incloses one end of the spindle and acts to transmit axial motion of the spindle to the valve and also acts as an auxiliary valve tobalance the pressures on the main valve, a sliding nut, a Weight upon which the nut rests, and means for releasing the Weight and permitting it to fall andthe nut to slide.

15. In a valve of the character described, the combination of a valve, a casing therefor, a spindle upon which the valve is loosely mounted, an auxiliary valve located at the end of the spindle which is arranged to engage the main valve under certain conditions and force it against its seat, and a dash-pot to checkclosing movements of the main valve.

In Witness whereof, I have hereunto set my hand this-18th day of January, 1912,

- WERNER JOHNSON.

Witnesses:

JOHN A. MoMANUs, Jr., FRANK O. HATTIE.

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