US2381222A - Control device - Google Patents

Description

--se1i ?-,-lapp'ing-control 'valve' device." I

Patented Aug. 7, 1945 x hairy-51o.

hisiinvention relates to fluid? pressm'e control devices 'andimor'e particularly. 130513116 self-lapping typ rthea present application being) a. divisionof myzcop'ending applicationSerialfNoa4851144; filed April 30,1943; 1 1

(Dine:objQQ j of:theinvention i-s the-provisionpf an; imlrnov ed fluid: pressure control valve device *5 Another: objecprofstheu invention. is the provi sionw of .a selff-lapping valve 1 device 'so' constructed andfiarnangedzas to requireaa relatively small degree: of: efiort:foryadjustin-gxon controlling it."

Other' obdents and; ad-Vantageswilkbe apparent from.thelfolldwingsn ore detailed description of the inventionzjg'; a a

Ina-the; accompanying drawing; the single figure is: a longitudinal; section'alwi'ew of the improved a; bore- 1inea with a sleeve" 80 'one end, off'which I extends'abovethe casing" while thebpp jsite end o'pens' to a pressure chamber 81 forr'ned above a flexible di'phragm tl' Above charnber"8"l is;an annular cavity 8-3f ncirclin g the" sleeve and open through'a'plurality' of ports 84 in the sleeve tof'tlie thereof? The Cavity 83 is; also oped-1th anoutlet passage 85; which may befconnected 'to apip'e (not shown) "in which it isv die-.- sirf to "vary pressure- .ofifluid forl contr'ollinga chosen, operation; or device. 'The chamber 81' is connectedfthrough a tabilizingvchoke BLBQtothe 1 The diaphragm 8'2 is arrang ed .in coaxial Jrela.-.

lm 1 mmthesleeve'mlandgis clampedfaround its e ge between.-the.fcasing. l2 and v the; adjacent end of 'a'" casin section 81.; An oppositely larranged. and axially aligned flexible a. diaphragm 89} of substantially the same ;areaasdiaphragm 3,3; clarnped. around its edge. between the oppositeend,oiicasing section 8 1: and a cover..90.- 'A

chamber; Si is. formed between the. diaphragm 89 and cover Mean-d is inconstant communication with the atmosphere" through a breather opening -provided' in an insect excluder 92;: The ad ja;-' centiaces of: the; two diaphragms-v 89 and? B2" are open to chambers 93 and? 94 respectively, which are in permanent:eommunication-l with-each other through a passage 95 provided in an annular pIiGd 'With fiuid under pressure from. a. fluid pressuresupply pipe- 352 'Ih'e c entral portion' o'f diaphragm'Bziis clampe'd between two -followersn loll and l l, the follower l 01 en'gaging ai collar H32 provided on aisten'i: I03 which-extends: through chamber 9'4 and: through said followers and" diaphragms into chamber 81-;

VA nut 99 disposed in-"chamber' 8| hast screw-'- threaded? engagementwith the wall of' a; bore? H14 provided in-the'*end of 'st'em I113 andlisa tightened v against the follower l llfl 'for clamping the; two

followers t'o thelopposite faces-mi the diaphragm BZ and forkthereby seeuring theone end of stem opposite side of-said diaphragm;

ltll 3 to said diaphragm. v i

' The rib 96 has a bore-lined witha wear bushing H15 arranged in axial alignment with the two diaphragms; andthe stem 103 extends through this: bushingand fc'entrally*through the 'dia-' phragm fl into chamb er' wh Above the rib QE -th'e stem N13 is reduced insection t'o provide a shoul= d'er I06? 'and a wear sleeve 'IUrT is-=m'ounted on this reduced portion of; the stem with-one end in engagement with said shoulder; The sleeve I01 extendsthrough the bushing H15? in: sliding con tact therewith andfz itsi opposite end contacts a fOHOWBi IUK Which'Jis diS'pQsed in chamber 93 in contact witn the uppersidev er diaphragm 89'. The stem H13 extends throughthe'- fo1lower I08 and a'rfollower' I 09- mounted against the opposite side oi th'e' diaphragm '83); and'a nut Hil provided ons'the endofstemvfllla within "chambeFH I is tightenedlagainstithe followerl 09 claniping same centrally tol'oneside of thedi'aphra'g'mj 89 and thereby securing the follower I 08 against :the'

In chamber-928 the I rib 96 supports'one' end of v mom-1161': spring" [H the opposite'end of which bears against an annular spring seat H 2 which I is 'slidably mounted on stem" I03? and urged by said spring int0= contact with a shoulder l l 3on said; sten'ii" The spring i's' preferablyfully expanded with-the parts ofthe devicein 'the posi tion shown in" Fig." 1 andis'- operative to oppose downward 'move'ment of'the stem l03andthereby of diaphi ag-ms 8'21 a'ridYfl-Q from this 'positioni, as willc belater described? t i j Y 'i' 1 The n'ut' SlQ aboveithe diaphragm. 8% ha an upwardly?extending sleeve-like" projection" I111 rib SG-extehdingrinwardly from the 'casingesection 1 BII 'abOVenthe'v diaphragm-189'. In usegchamber- .M'F'and thereby chamber r 93 are constantly supand-adjacent end ofsleve 8'0 be1ow thee ports I I 81; ba e row iii the-{diaphragm connecting stein" F0 3?is in permanent communication through one*or"morepores l l 5' wi'th chamber- !lfiand 'con' tains a fluid pressure supplyvalve" H va lve hasww fluted stenr- H TeXtendihg tlirough'an axial bore in the nut into the sleeve-like projection I I4 thereof, wherein it contacts a preferably separately formed, fluid pressure release valve H8. The nut 99 is provided in bore I04 with a seat for engagement by the supply valve H6 and a spring II9 contained in said bore acts on said valve for urging same into contactwith said seat.

A plunger I23 is slidably mounted in sleeve 80 above the release valve H8 and is provided with an annula groove I24 containing a sealing ring I25 contacting the bottom ofsaid groove and the inner wall of said sleeve for preventing leakage of fluid under pressure from a chamber I26 below the plunger to an annular chamber I21 above the plunger. The chamber I26 is in permanent communication with the interior of theprojection I I4 of nut 99 and through the ports 84 with the annu- I lar cavity 83 encircling the sleeve. The chamber I21 above the plunger L23 i in constant communication with the atmosphere through one or more radial ports I29 provided in the sleeve 80.

The plunger I23 has a portion I30 of reduced section depending therefrom into chamber I26 and provided with an axial bore opening through a valveseat onits lower end which seat is provided for engagement by the release valve H8. The release valve has a flutedstem I3I extending through this seat and bore into a bore 132 of larger diameter in which there is slidably mounted a-spring seat I33 having one or more openings I34 adjacent its peripheral edge connecting the spaces at the opposite sides of said seat.

The plunger I23 also has an upwardly projecting portion I35 of reduced section extending through chamber I21 and in sliding engagement with an inturned collar I36 provided at the upper end of sleeve 80. The bore I32 extends to a point above the collar I36 where it joins a screwthreaded bore I31. Just below the end of the screw-threaded bore I3I the portion I35 of the plunger has two oppositely arranged radial bores I38 in which are disposed pins I39 extending from opposite ends of a cylindrical spring seat I40 which is of slightly smaller diameter than bores I38 so that'said seat may be inserted into bore I32 through either of the bores I38. A coil spring MI is disposed in bore I32 under pressure and acts at one end on the spring seat I33 and at the opposite end on spring seat I40, this spring biasing the. release valve IIB 'to its open position r shown and moving the spring seat I40 upwardly until, the pins I39 engage the uppermost portions of-bores I38in which position the spring seat I40 is held against longitudinal movement and thus secured within the bore I3 2; The spring I4I acts to constantly maintain the release valve H8 in engagement with the end of the supply valve stem-IIL An operating screw I is threaded into bore I31 in theupper end of the plunger projection I35 and on its outer end is provided with a head I46. A lock nut I41 mounted on screw I45 is arranged to engage the end of the extended portion I35 .033 the plunger for securing the screw I45 in an adjusted position. A coil bias spring I48 encircles the portion of sleeve 80 extending above the casing and is supported at one end on said casing and the opposite end bears against a ringshaped seat I49 secured on the extended portion I35 of. the plunger by any suitable interlocking means I50. This spring is under relatively light pressure for biasing the plunger I23 in an upwardly. direction and out of seating contact with the release valve I I8.

The head 6 0f the'actuating screw I45 and thereby plunger I23 are adapted to be moved downwardly from a normal position in which they are shown in the drawing, by any suitable means, such as a rockable cam I54 supported on an operating shaft I55 and connected to an actuating lever II. The cam has two reversely arranged butotherwise identical cam surface I and I6I joined together by a depression I62. Interposed between and connecting these cam surfaces and the head I46 of the adjusting screw I45 is the cylindrical end I of an arm I64 the opposite end of which may be supported 'to rock on a fixed point (not shown).

In operation when the cam I54 and lever H are in their normal or neutral positions, as shown in the drawing, the depression or recess I62 is positioned to receive the cylindrical end I65 of the follower arm I64 to permit spring I48 acting through seat I49 on the plunger extension I35 and thereby on plunger I23 to move said plunger and the adjusting screw I45 to their normal positions shown in the drawing Upon rocking of lever I'I out of its neutral position in eith'er one or the opposite direction, the cam I54 will act to displace plunger I23 into the sleeve 80, while rocking said lever back toward neutral position will permit :spring I48 to move said plunger out of said sleeve. It will thus be seen that with lever IT in its neutral position 'the'plunger I23 will occupy its normal position shown in the drawing, while with said lever out of neutral position, the plunger I23 will be displaced from its normal position into sleeve a distance proportional to that which lever I1 is out, of neutral position.

When the screw head I46 and plunger I23 are in their normal positions shown in the drawing, the spring I I9 will seat the supply valve I I6 and spring I4I acting on stem I3I of the release valve II8 will maintain said release valve in contact with the end of the supply valve stem II I and thus out of contact with its seat on the end of the portion I30 of plunger I23. As a result, chamber I26 below the plunger I23 and thus the connected annular cavity83, outlet passage and chamber 8| above diaphragm 82 will be open to the atmosphere past the release valve I I8.

If now the cam I54 is operated to displace the screw head I46 and plunger I 23 out of their normal positions against the biasing force of spring I48, the movement of said plunger will be relative to the release valve I I8 until said valve is engaged by its seat provided on the portion I30 on said plunger. This seating of the release valve will close the fluid release communication to the atmosphere as will be apparent. Fur-ther movement of the plunger I23 into sleeve 80 will then act through the release valve H8 and stem II! of th'e supply valve I I6 to move said supply valve relative to the diaphragm 82 and thus out of contact with its seat on the end of nut 99.

When the supply valve I I6 is thus opened, fluid under pressure will flow from chamber 94 past said valve to chamber I26 and thence to the outlet passage 85 and to the device (not shown) which it is desired to control. Fluid under pressure supplied to the outlet passage 85 will also flow through stabilizing choke 86 to chamber 8I above the diaphragm 82, said choke being provided to prevent the pressure in chamber 8I increasing substantially ahead of the increase in passage 85 by the supply of fluid under pressure to said passage.

The pressure of fluid thus supplied to chamber 8I past the supply valve 6 acts on diaphragm 82 in opposition to the force of control spring III, and when this pressure is increased to a degree which overcomes. said spring, it. deflects the diaphragm in a downwardly direction.relaobtained in chamber 8| and in the outlet pas-' sage 85 is limited in'accordance with the extent of movement of the supply valve II6 away from its normal position shown in the drawing, or in other words, in accordance with the extent of movement of the adjusting screw I45 after closing of the release valve I I8.

If it is desired to increase'the pressure of, fluid in the outlet passagev,85,fthe cam I54 will be operated to displace the plunger I23 further in the direction of the diaphragm 82 which will again mov'e the supply valve IIB relative to said diaphragm and out of contact with its seat, this relative movement being obtained since the diaphragmv 82 at this time is in a static. condition with respect tojthe pressure of spring II I and opposing pressure offluid in chamber 8|. This unseating of the supply valve II 6 will again allow fluid under pressure to flow to the outlet passage 85 and to chamber 8| above diaphragm 82; The increase inpressure in chamber 8 I will then; again deflect said diaphragm'in a'downwardly direction relativeto and finally into contact with the supply valve for limiting theflow of fluid under pressure to passage 85 and thus the pressure of fluid obtained in saidpassage in accordance with the new position of the actuating screw I45 and of the supply valve IIB with respect to their normal positions.

It'will thus be seen'that the pressure of fluid in the outlet passage 85 may be increased in any desired 7 increments by suitable increments of displacement of the adjusting screw I45 and supply valve II6 away from their normal positions fluid may be provided in the outlet passage 85 by movement of the adjusting screw I45 to a position in which the spring seat I48 in the extension I35 of the plunger is in substantial contact with the adjacent end of sleeve 88.

' If after fluid under pressure is supplied to the outlet passage 85 it is desired to reduce the press'uretherein, then the cam I54 and lever Il may be turned back toward their neutral position to allow movement of the adjusting screw I45 and plunger I23 upwardly by spring I48. With the diaphragm :82 in a balanced condition by the pressure of fluid in chamber 8| and the opposing pressure of spring III, thismovement of the adjusting screw I45 and plunger I23 will be relative to the releasevalve II8 which will be maintained in contact with the supply'valve stem III by spring I4I. As a result, the plunger I23 will move out of seating engageament with the release valve to thereby allow release of fluid under pres-' sure from the outlet passage 85 and chamber 8| above the diaphragm 82. The pressure of fluid in chamber 82 acting on diaphragm 8| in opposition to that offspring III will therefore'b'e re-' 1 duced and said spring will accordingly deflect the diaphragm 8| in the direction ofthe plunger I23 in accordance with thedegree of such reduction,

- of fluid in the outlet passage 85. It ill thus be shown in the drawing. A maximum pressure of As the .diaphragm 8l is thus moved upwardly the supp y and release valves I I6 and H8 are moved with the diaphragm by spring I I9 and such movement will be relative to the plunger I23.

The pressure of fluid in the outlet passage 85 and chamber 8| will thus continue to reduce until the release valve I I8 moves into engagement with its seat on plunger'l23, in case said plunger is still out of its normal position. This seating of the release valve 8 will then prevent further release of fluid under pressure from the outlet passage 85 and chamber 8|; thus limiting the pressure in said passage and chamber to a degree determined by the distance the plunger I23 and regulating screw I45 are still away'from their normal or neutral positions.

If it is desired to make a further reduction in pressure of fluid in the outlet passage 85, the lever I! may be turned further toward its neutral position and the structure will again operate in the same manner as just described to effect a further and corresponding reduction in pressure seen that the pressure of fluid in the outlet passage 85 can be reduced in any desired increments determined by the extent of movement of lever I I back toward its neutral position. When the lever I1 isreturned to neutral position and the adusting screw I45 and plunger I23 are returned to their normal position under the action of spring I4 I, a complete release of fluid under pressure will occur from the outlet passage 85 and chamber 8|, since'at the time the pressure in said passage andchamber became reduced to substantially that of the, atmosphere, the spring III will be fully. expanded and the release valve I I8 will still be unseated;

If it is desired to increase the pressure of fluid in passage 85 from that of the atmosphere to a degree in a single step, such may be accomplished by moving the adjusting screw I45 from its normal position to its maximum pressure condition above described without intermediate stops as will be apparent. On the other'hand, if it is desired to reduce the pressureof fluid in passage 85 to that of the atmosphere in a single step that may be accomplished by return of lever II directly to neutral position from whatever position it may be in outside of neutral position, as will also be apparent.

fli'romthe above description it will now be noted thatwith outlet'passage 85 open .to' the atmosphere there will be no pressure of fluid in chamber I26 to 'opposedownward movement of the plunger I23; and it will be further apparent that the force a which opposes such movement of plunger I23will increase as the pressure of fluid is increased'in'said passage. However, with the maximum degree of pressure effective in passage 'and in chamber I26 on the plunger I 23 the efi'ort required 'to move the plunger I23 will still be only a small portion of that required to counteract the pressure of the control spring, and this is important, particularly in case of manual control of the device as by lever II, since it provides for'very accurate adjustment of the device to be provided. in the outlet passage 85? and; will also minimize fatigue onthe part of an operator. Having now described. the invention, what I claim as. new. and desire to [secure byLetters Patent, is: a I

l. A self-lapping valve structure comprising in combination, two connectedmovable abutments cooperating to form a: pressure chamber normally charged withfluid under pressure, a spring in said. pressure, chamber. acti'ng on one of. said I abutments, a supply valve movable relative to.

said; one abutment to open communication be tween saidpressure chamber and: a receiving chamber 'at the opposite sideof said one abutment,.. said abutments being movable by pressure of fluid supplied. to saidreceiving chamber against.

said spring. and relative to, said. valve to close said communication, arelease valve in said, receiving chamber having; operating contact with said supplyv valve, a plunger. having a, seat for said. release valve and. cooperative therewith to control a communication between said receivingv chamber and, atmosphere and cooperative with. said release valve upon closing, such communication to move said supply valverelative, to

said one abutment, said plunger being subject.

abutments-, means connecting the opposite. end

of. said" strut to the other of said abutments, a coil spring in said chamber encircling said. trut and bearing against said other diaphragm,.. a' supply valve carriedby saidmeans and, arranged .to move axially-of said other. abutment for opening a communication.betWeensaid chamber and. areceiving. chamber at the opposite side, of saidv other abutment for. supplying, fluidsundjer. press sure to said receiving; chamberfor movingfsaid abutments, against said spring, a release valve having operating contact with said supply valve, a plunger movableaxially of said valves and having aseat for said release valve andarranged .to cooperate therewith for controllingcommunication between said receiving chamber; and. at mosphere, said, plunger being movable into con: tact withsaid release valve forjclosing the com munication controlled thereby and being then operable to move said release valve for moving. said supply valve relative to said other abutment for. opening communication controlledby said supply valve, a springv interposed between, said plunger and release valve for biasing said plunger to a position for opening. communication between saidreceiving chamber and atmosphere, another spring actin on said plunger biasing, sameto its communication openingposition, and means for, moving said plunger against the last named spring. in the'direction for. closing said release I valve and opening saidlsupplyv'alve.

3. A self-lapping valve structure comprising in combination, a movabl'ejabutment subiectfon one side to pressure of. fluid afchambena control spring acting on the opposite. side of said, abutment in opposition to pressure'offlu'idin said I from said. chamber and being then operative to actuate said release valve to "open said supplyair system in accordance with. the pressure ofifluidde'sired j chamberiasupply"valvefor supplyihg'fluid underpressure to said chamber, aseat for saidsupplyvalvefmovableby and With'said abutment in the direction or said" supply valve iuporr'an increase in pressure in said-chamber; means acting onsaid supply valve urgingsame" toward said seat; a re lease valve for. releasing fluidunder pressure from said" chamber and having. contact with said sup- I ply valveand operativerto unseat same; a plunger subject to pressure of fluidjn'saidchamber and having a seatfor said releasevalve', saidplunger being movable into contactwith saidrelease' valve for closing"thje' fluid "releasing communication valve, said plungerbeing'als o movable inthe opposite direction, a spring interposed between said plunger and; release valve'operative to hold said release valve againstmovement upon movement of said plunger in said opposite direction. for thereby. opening the fluid releasing communication past said. release valve, and; means for controllingmovernent ofsaidplunger. a a

Aself lappin'g valve structure comprising in combination a controhspring; a movable abut.- ment subject. t'olopposingjpressures of said spring and of fluidfinv a chamber, a supply'valve; a release valve, saidvalv'es (beingof the po'ppettype coaxially aligned and movable. in'unison and arranged to seat inthe'same direction, seating. means associated' with saidabutment having a seat for said. supply valve said supply valvev being mov-.

able out. of contact said seat for supplying fluid'under, pressure ,.to. said, chamber and said abutment.being'jrnovable against said spring by pressure of fluid suppliedjto said chamber to, move. said seat'into contact with. said. supply. va1ve,, ,a plunger coaxially aligned" with said release valve andhaving a s'eatjfor' engaging. same, said plunger being operable upon:.se'atingpngagement with said release valve to close a fluid release com.- municationirom saidchamber and being then operative. through said release valve. to. unseatsaid. supply, valve,,sa. i d plunger. being, also movable in. the opposite direction, a; spring. acting. on

said. supply. valve .iorjurging same into. contact.

withsaid seat',, a. spring interposed between. said release. valve, and plunger for; opening said; release valve. upon nibvemen'tof saidv plunger in said o positeedirection, and means for controlling movementpf saidplunger; v 1

5. A self-la ,ping..va1ve structure comprising a casing, aLnrioIvable abutment .insaidlcasinghaving atv one. sidel'a pressure chamber, a spring. in said casingacting .on. the, opposite. side or, said abut.- ment, ,a. sleeve in said casin ,a' ran'ged in coaxial relation with said abutment and having one end opento said chamben a. member in said chamber having, sliding contactwith said; sleeve, and se cured to said abutment centrally thereof, a fluid pressure-supply. valve associated ,with said, member and movable inthe direction-1Qfsaidspring for supplying fluid undenp'ressure, to. said chamber, pressure oiiluid. inc-said. chamber. being. effective on Saidabutment. for moving same. against said spring s; closing. said supply valve, a[ spring acting on said. supply valve for urging same to ts closed position, a. releaselvalveengaging said chamber andi'a passage, in ,said plunger. leading to the atmosphere, said'plunger'being'then opcasing, a movable abutment in said casing having at one side a pressure chamber, a spring in said casing acting on the opposite side of said abutment, a sleeve in said casing arranged in coaxial relation with said abutment and having one end opento said chamber, a member in said chamber having sliding contact with said sleeve and secured to'said abutment centrally thereof, a fluid pressure supply valve associated withsaid member and movable in the direction of said spring for supplying fluid under pressure to said chambenpressure of fluid in said chamber being effective on said abutment for moving same against said spring for closing said supply valve, a spring acting on said supply valve for urging same to its closed position, a release valve engaging said sup-- ply valve, a plunger slidably mounted in said sleeve and having at one enda seat arranged to cooperate with said release valve upon movement of said plunger in the direction of said spring for closing communication between said chamber 7 and a passage in said plunger leading to the atmosphere, said plunger being then operative upon movement against said release valve tounseat said supply valve, and being movable in the opposite direction to provide for seating of said supply valve and movement away from said release'valve, a spring interposed between said plunger and release valve operative to hold said release valve against movement upon seating of said supply valve, a bias spring acting on said plunger. urging same invthe direction away from said release valve, means arranged to move said plunger in the direction of said release valve, another movable abutment arranged in coaxial relation with the first named abutment and being of the same area, the two abutments cooperating to form a chamber containing said control spring and normally supplied with fluid under pressure, and said supply valve being arranged to control supply of fluid under pressure from the last named chamber to said pressure chamber.

HARRY 0'. MAY.

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