US1776569A - Terminal check valve - Google Patents

Description

sept. 23, 1930. G. H ROBERTS 1,776,569

TERMINAL CHECK VALVE Filed Feb. 14, 1927 2 sheets-sheet l flbtozmqa G. H. ROBERTS TERMINAL CHECK VALVE Sept. 23,- .1930.

Filed-Feb. 14, 1927 2 Sheets-Sheet 2 if; T3259 uw 107 -f 72 l 117 97 @Mantenga .Patented Sept. l23, 1930 GEORGE HENRY ROBERTS, orl ROOKISLAND, ILLINOIS, AssIeNORTO.MADISON-Kirn CORPORATION, or MAnrsON, WISCONSIN, 'A OORPORATTON or WISCONSIN f TERMINAL CHECK vAIivE replication filed February 14,1927.` seria1N;-1G,219.`

The present application is inpart a continuation oft-wo prior 'applications filed by me, namely, check valve, Serial No. 17,498,V

valve, Serialliled March 23, 1925, and check No. 93,613, filed: March l0, 1926.

Theinvention relates-to vforce feed lubrication,"and more particularly to force'feed lubrication asapplied to. steam power plants,

for example, steam locomotives;Y

The object of the invention is to produce animproved terminal check valve suitedlfoi this service.'

Generally stated, a terminal checkvalve isa check valve interposed between a force feed lubricator' and steamrpassage and designed to Open to permit liowof-oil from the Alubricator to the passage andto close to prevent back-flow from the'passage to the lubricator. Various typeshave heretofore been 0 used, and the present invention is ofthat known type in which' the valve is actuated by a diaphragm urgedV in valve opening` direction by oil pressure and so loaded as to 2r remain closed until the oil pressure reaches a sa e.

Virlli-prior devices the diaphragm was loaded mechanically, usually by means of an adjustably stressed spring. Such valvesl Were subject to mal-adjustment and to spring' failureseither of which would occasionally permit steam to penetrate to the forcefeed lubricator, I with disastrous results.

present device is that the diaphragmis loaded by fluid Iunder pressure, ywhich is favorable `to long life of the diaphragm. Since the fluid pressure` is preferably boiler pressure, it follows that the closingtendency of the valve must always be suliicient lto maintain the' valve closed until oil pressure exceeds any pressure which can exist in the steam passage, at which times oil will flow to thesteampassage.` Thus the valve is always closed unless oil is actually flowing to the point of'use'.`

The presence'` of boiler steam in l the terminal check valve makes it conveniently possible to by-pass a: smallportion" ofthe boiler steam to' the Oil passage leading from'the value in'eXcess of pressure in the steam pas` An important lfeature of novelty of the checkl valve tothesteam passage,` and thusV steam is fedlatlall ,timesn and particularly" when themain throttle is" closed and the'engine is drifting. This flow of steam preventsthe accumulation Ofwater of condensation in the top chamber, which isan incidental ad-Y vantage, and such flow sweepslthe olthroughA the oilpassage and discharges'it in atomizedf form intok the steam passage.l Tl'u's, when the engine isV running under steam, theoil is delivered to theflowing steamin the steam passage in an atomized c'ondition VVllenthe'r engine is drifting with the throttle closed' andthere' isno' steam iow'in the' steam pas# sage, the oil is swept outof'tle Oil4 passage and deliveredY in a spray,linstead Ofbe'ihgdelivered in drops'which Wouldreadily ac'cuiiu late and carbonize. Carbonization of the oil` occurs inV locomotive cylinders when the engine is drifting, because when the engine* drifts products of combustion from the smoke box at timesdiawn into the cylin der through the*exhaustnozzleV @il sprayed" in with a small quantityof 'steam is less'likely to carbonize, andds brought into contact with the 4moving partsinthe valve chest andJ cylinder so as" to lubricate effectively.

This feature offby-'passingboiler steamto the oil-passage may be used with other types of check valves, and I do not limit* this fea-- ture of vthefinventioii"to` the particular type vof check valve here illustrated.' Y

Various embodiments of the inventive lconcept ar'e illustrated in the accompanying drawings, inwhich,'- y n Fig; 1 is aside' elevationof'a steam chestA and oylinderlvvith a'portiono'f` the valve' gear showing ,the application off a force feed lubri# cater and a terminalfcheck valve of thetype here. described and claimed* v TEig. 2 is an endfe'levation ofthe sanie Fig.` B'isa vertical axial sectionof a com"- meroi'al embodiment of the term-inail check valve. I

Fig. 4 is ad plan view Of the differential! diaphragm assembly with al portion brokenaway te sh-Owthe spacers. i

Fig. 5 is-alvertical axial section of aforrrrv of the check valve illustrated Seria'lfNo.17,498'abovementionedf f I Fig. 6'` is na similar view of aterminal check ,ini applicationv valve as illustrated in application Serial No.` 93,613, above mentioned. Y

The casing of the check valve consistsof a body 6 and a cap plug 7 threaded at 8 into a projecting annular flange 9 formed on the body. The body 6 is formed withan oil pressure chamberglO-and the cap 7 is formed with a steam pressure chamber 11 which terminate', respectively, at shoulders 12 and 13 formedon the body and cap.

The shouder 12 is formed with an annular groove 14 and the shoulder 13 is formed with an annular groove 1 57 of the same diameter.Y A port 16 leads from the space 11`to the groove 15. A port 17 leads from the groove 14 to the oil discharge port 18. vClamped between the shoulders 12 and 13 are the bottom diaphrag1n`19v7 and an interposed spacing ring 21. ring 21 has on itsupper tace an annular groove 22 opposed to the groove 15 and on its lower face an annular groove 23 opposed to the groove 14. The grooves 22 and 23 are connected by a port 24. The diaphragms 19 and 20 are provided with small holes 25 and 26 which respectively connect the groove 14 with the groove 23 and the groove 15 with the groove 22. Consequently a by-pass for steam is afforded vfrom the chamber 11 to the port 17 whether the diaphragms 19 and20 are assembled with the'holes 25 or 26 alined or not. f

The space between the diaphragms 19 and 2O is vented to atmosphere by way 'of port 27 in the spacing kring 21 and port 28 in the Harige 9. The groove 44 around the outer margin or the spacing ring 21 makes it unnecessary to aline the ports 27 and 28.

A valve carrying member 29 is formed with a threaded upward extension 30 which extends through openings at the center of diaphragms 19 and 20 and also through a spacing member 31 interposed between the middle portions of these diaphragme. A nut 32 threaded on thestem30locks thediaphragms and the spacing member together and seals them to the carrier 29. y

As is clearly shown in Fig. 3, the spacing ring 21 is beveled alike on its upper and lower face to afford clearance for the movements of the diaphragme.` The spacing ringY 31,however, is flat on its upper face and beveled or conical on its lower face, the form being such that the area of engagement of the ring with the upper diaphragm 20 is much greater thanthe area of engagement of the ring with the lower-diaphragm 19. It follows that there is a decidedly greater resistance to upward movement of the valve carrying member 29 than there is to its downward movement, partly as a consequence of the resistance of diaphragm 20 to upward leXure. nthis way a dierential resistance is imparted to' `the diaphragm structure which gives the valve a bias in favor of a V,the top diaphragm 20j This the diaphragmv 19 throughk a port 40.

downward or valve closing movement. VThe structure is in edect a differential diaphragm and since both diaphragms are the same size is easer to construct and assemble than a conventional differential diaphragm structurel requiring two sizes yof diaphragms wouldv be. The diEerential etect is pronounced, a steam pressure of 200 pounds per Vsquare inch balancing an oil pressure ot' as much as 250 pounds per .square'inch Formed onthe lower end of the .valve carrying member 29 is a threaded tubular eX- tension 33 within which is mounted a headed pin valve 34. This is sustained in position by a coil spring 35'which surrounds it and which engages at its upper end under the head of the pin valve and which is supported at its lower end by an annular cup-shaped Vnut 36 screwed on to the extension 33. The

mounting is such that the pin valve is held upward in engagement with the valve carrier 29 so as to be moved positively in closing direction but is yieldingly supported so that it may accommodate itself to slight irregularities in the location of its seat.

' The seat for the pin valve 34 is formed in a ported bushing 37 which is screwed into the body 6 at the bottom of the chamber' 10. The port in the seat 37 communicates directly with the port 18 and the port 18 terminates at the end of an extension 38 formed with pipethreads 39.

Oil is delivered to the chamber 10 beneath A union, indicated generaly by the reference numeral 41, connects thev high pressure oil pipe 42 with the port 40. A pipe threaded opening 43 in the top of the cap 7 admits boiler steam to the space above the diaphragm 11. The ports 27 and 28 are provided merely to vent the space between the two diaphragms and indicate leakage,- should Vthis occur.

f The check valve above described may be used as illustrated in Figs. 1 and 2, in which l 49 represents a locomotive boiler, 50 the main steam pipe controlledv by the main throttle and leading to a steam chest 51 which contains a distributing valve mechanism for the steam cylinder 52. 53 is a portion of the valve stem guide and 54 is a combination lever forming a port-ionof a lValschaert or similar valve gear. The locomotive parts just mentioned are chosen as typical and it will be understood that the combination lever is representative otany reciprocating part from which motion can conveniently be derived. y

Lever 54 is connected by a link 55 with the lower end of a swinging drive arm 56 fixed ontheV oscillating drive shaft 57 of a force feed lubricator, indicated generally by the numeral 58 supplied to the oil tank. A pumping unit or units are mounted inside tank,v as.; shown iiorzl exam-ple .inl Patent No..1,522,673,` Goles', January lf3?, 1925;

, TankVS iss` supported bya bracket 59 on a portion of the steam/chest 51 andthe lubricator delivers. oil under press-ure through one or-more discharge pipes, one of` which isfindicated by the 'numeral 425 which is the oil pipe leading to ltheterminal check valve.

.The threaded extension 381 of thecheclr valve already ldescribed isy screwed-- into a fitting l60, commonly called a quilhY which projects intothef steam pipe 50 and which is designed to discharge oil; received' from the passage lwithinl the steam pipe 50. 6l is a live steam pipe connected directly with. the boiler so that it receives boiler steamI whether the main throttle which supplies-steam to the steampipe is openedor closed, The pipe G1 isfconnected: asshownfin Fig; l to the threaded opening 43inlthe cap 7 rllhiuipwhen the boilerisunder steam the diaphragm 20 is'co-nstantly subiecty toboiler pressure acting` downwardly on the upper `face of the diaphragm.v Whenever the engine isV in motion the diaphragm i9 is subject to the pressure develope-d'by the lubri cater pumpacting'upward. v It follows that onlyV when oil" pressure predominatesv over boiler pressure the valve 34 will open. The amount by which the4 oil pressure must pre-` dominate dependsy on thediiferential .characteristie of the diaphragm structureV and may loe-varied by variousobvious changes .in

. the design of thediaphragm structure.

In Fig: 5.a simpler embodimentof the vention is illustrated.

Int-his structure; thecasing of the device lllcon-sists of a sleeve71i threaded at its to receive atop cap 72 and a bottom cap 73. Thetfop cap 72 isforrnedwithl a steaminlet connection 741 which leads tri-.a` steamv` ch au1-v ber 75 above alarninated diaphragm 76. The diaphragm 76: is clampedbetweena shoulder within cap72andal sealing'ring 77 whichis, seated on the end-ofthe; sleeve 71!V Thediaphragm 761is connected at its center: by a; cap screwr78 to the:- thrust block 79..,

I The. bottom,cap 73,;isformed;withan oil inletconnectionV 8l. which leads` to the oil pressure chamber 82 beneaththe laminated diaphragm 873. This diaphragmis clamped between aV shoulder V'inthebotto-m cap -7 3 and aysealing ring, 84:; which abuts against the end Eof the sleeve 71; The middleportion'of thedlphlagm 83 is clamped; toa thrust block` 85 which is in thrust engagement with-the thrustblock 79. The connectionbetweenthe diaphragrnand the thrust blockis madeby means cfa threaded plug 86which is formed with a Centralapertureto receive and guide apin valve 87. This valve-is formedwith an enlargement on head atE its upper. end which works in 4*a recessiforrned 4`in thethrustmember 85 andthreaded plug 86. A coilspring; 88 surrounds. the: pin valve;` 87- Y and l seats, on

theY plug=86 and against the .underside` of the head of; the pin. ralveyholding this ,up-i

ward in engagement with fthe tlirustJ block` trolsthe port throughthebushing 89 and conseqnently controls the discharge` of"` oil through the port 9].. The space between the dia-phragms` 7.6.1 and S3 is ventedvto atmosphere at 92. ln this; device boiler steam' is admitted at 74, oil=fromthetorceV feed lubrif. cat-or isV admittedat 8lV andthis oil is discharged through the port 91-to the steam passage. The device is connected` in the same manner'and; operates in substantially the same manner as that shown in Fig. 3; The differences are th at no steam Vis lay-passed fromv the space 75 to the passage 91, and the diaphragms are not connected but are merely in thrust `relation with each other; Tehere is a differential action between thefupperand lower diaphragme, the lower diaphragm seating` against a reduced neck onthe. inemn ber 85 so that it has a larger, unsupportedfarea than the upper diaphragm 7 6 which seats over the entire area of themember79 In Fig. S another modification of the in@ vention is illustrated. In this instance the body of the deviceconsists of a casingmem ber into which is threaded a cap plug'96. 'l'."he diaphragm structure consistsof a lower laminated diaphrag n 97ya an upper laminated diaphragm 98, anda conical spacer 99 which like the spacer of Fig. 8 has a smaller varea of Contact withthe lower diaphraginthau with theupper diaphragm so asto produce the differential effect; already desc ibed.`

The spacer 99 is connected with the upper diaphragm 98 by a cap screw 100.` and-with the lower diaphragm 97 by a. threaded plug 10i which guides aypin valve l02having a head at upper end. The head of the pin valve works in a recess formed in the plug lOlyand is held-in its upward position by a spring 10o: The valve coacts with a port in theseat bushing 104 screwed into the body VBetween the margins of the two diaphragme is a spacer structure including an annular member 105 having a circumferential groove or channel OS on its outer face. The purpose of this channel to secure connection of a through port 107 in the ing member with the vent port 109 in the body 95. The lower diaphragm on a shoulder in the body 95 and the` annuflar member 105 seats on the diaphragm. The

f" i 9.-/ seats upper surface of the member 105 is oeveled 'i to receive-a beveled sealing ring` l09'which tits closely within the body 95 and which may be slightly deformed `solasto expand into sealingcontact as a resultfotits .wedginpj engagement withthe spacer 105. LT-hedias,

leo

phragm 98 seatson the upper face of the ring 109 and is clamped thereagainst by an annular face 110 on the cap plug 96,

Formed in the body 95 and outside the face 110 is a channel' 111 which communicates with the space 112 above diaphragm 98 by means of Vports 113.' Channel 111 also communicates by means of port 114 with the oil discharge port 115 to which the port in valve seat 104L leads.

Oil is supplied through the port 116 to the space 117 beneath the diaphragm 9?, and under the control ofthe 'pin valve 102 discharges through thek port 115. vSteam at boiler pressure is delivered through port 118 to the space 112 above the diaphragm 98. A portion of the steam is by-passed through the ports 113, 114-. and 115 to mii: with the oil which has passed theV valve.

It will be observed that the structure of Fig. 6 is functionally identical with the structure of Fig. 3, including as it does, the differential diaphragm effect, the by-passing the steam to the oil discharge port, and vsimilar features.

The structures of Figs. 5 and Gare illustrated to establish theL identity of subject matter here claimed with the subject matter of the two original applicationsrabove identified.

While the structures illustrated and described, and particularly that shown in Fig, 3, are preferred, for practical reasons, I recognize that the invention is susceptible of embodiment in specifically j different forms'. The prime advantage is the elimination of the loading spring and the substitution of fluid pressure, usually steam pressure and preferably, but not necessarily, boiler pressure. Any source of adequate pressure which is always charged when the engine is in motion, might be used, so Yfar as the broadest aspect of the invention is concerned. j

Unless the source of loading pressure is substantially higher than the pressure inthe passage to which the oil is to be delivered, the valve should be given a bias in a closing direction, and this effect may be produced in various ways. The most convenient is to make use of lsome differential diaphragm mechanism. By differential diaphragm mechanism, I mean one in which the valve will not open until the oil pressure acting in an opening direction materially exceeds the fluid pressure acting in a closing direction. It is immaterial, so far as the broad aspects of the inventionv are concerned, whether this effect is secured by the use of an asymmetric spacing member, as described, or by the use of conventional differential diaphragme.

V`What is claimed is,-

1. vrIhe combination of a steam motor; a steam line forsupplying steam thereto; an

oil forcing pump; a valve; oil conducting connections from the pump to the valvel and from the valve to ya steam space associated With. Ysaid motor; an abutment mechanism connected with said valve to voperate the` same; means for subjecting said abutment mechanism'to the pressure of oil pump discharge acting in a valve opening direction; and means for subjecting said abutment to an approximately constant fiuid pressure acting in a valve closing direction.

2. The combination of a steam "motor; means for supplying steam thereto; an oil forcing pump; a valve; oil conducting connections from the .pump to the valve andv from the valve to a steam space associated with the motor; an abutment mechanism con- Athe motor; an abutment mechanism connected with said valve to operate the s me and having a bias ina valve closing direction; and connections whereby said abutment is subject in valve closing direction to supply steam pressure and in lvalve/opening direction to the pressure of oil pump discharge, the parts being so proportioned and arranged that oil pressure opens the valve in opposition to supply steam pressure in the ordinary operation of the device.

1. The combination of a steam motor; a main steam line for supplying steam thereto; an oill forcing pump; a valve; oil conducting connections from the pump to the valve and from the valve to a steam Aspace associated with the motor; an abutment mechanism connected with said valve to operate the same; means for subjecting said abutment mechanism to the 1 pressure of oil pump discharge acting in valve opening direction; and means independent of the main steam line for subjecting said abutment mechanism to supply steam pressure acting in valve closing direction. Y Y v 5. The combination of a steam motor; means for supplying steam thereto; an loil forcing pump; a valve; oil conducting connections from the pump to the valve and from the valve to a steam space associated with the motor; a diaphragm structure connected with said valve to actuate the same; connections whereby said diaphragm structure 1s subject 1n valve closing direction to live steam pressure and infvalve opening y rection tothefpressure of oil pump disclia ge; and means servingto impartito said 4diapliragm structurea differential characteristic Wherebyythe valve ishheld `closed until oil pressure predoniinates in a substantial degree. y Y 1 6. The

iorcing pump a valve oil conducting connections from the, pump the valve Vand 'from the valve toa steam space associated with the motor; aLPai-r of diaphragme connected toactuate said valve; `one subject to supply steam pressure actingto close thevalve andV theotlier subjecttoV aoil pump discharge' presi toV actuate said valve; one subject to supply steampressure acting to close the valvefand they other subjectto oil pump discharge pressure acting to open the valve; and a connecting spacerA betvveensaid diaphragme, said spacer having a larger area 03El Contact with thesteam pressure diaphragm than with the oil pressure diaphragm.

"8.- The combination o'l ai steam motor; means for delivering steam thereto; an oil forcing pump; -a valve; oil conducting connections from `said pump to said valve and from said valve to a steam space associatel with the motor; means responsive to oil pressure foreopening said valve ;and a connection arrangedto deliver live steam to the oil connection between said valve. and steamfspace.

9. The combination o'-a steam motor; means for supplying'steani thereto; an oil forcing pump; a valve; oil conducting coni nections from the pump to the valve and from the valve to a steam space associatedivith the motor; an abutment mechanism connected With said valve to operate the same;"con nections whereby said abutment is subject in valve closingdirection to live steam at supply pressure and invalve opening direction to the pressure of oil pump disclifrge; and a bleed connection leading live steam from adjacent said abutment to the oil connecticii between said valve and steam space.

l0. The combination of a steam niotoi'; a main steam line for supplying steam thereto; an oil forcing pump; a valve; oil conducting connections ;trom said pump to said valve and from said valve to a steam space associated With the motor; means responsive to oil pressure for opening said valve; and

combination of a steam motor:` means tor supplying steam thereto ;1 an oilv means independent of said main steamcon-v nections lfor delivering `liveV steam tosaid Oil connections betweensaid valve and steam space.` v-

i i y A lll.;` The. combination` of a steammotoia main steamsupply line leading thereto; an oil; forcing pump a v. `ve; oil conducting connections from the pump to tlievalve and from the valve to a steam space associated With the motor; an abutment mechanism corn nected with said @valve to operate the same; means; for subjecting said abutment mechanism to` thel pressure, of oil pump" discharge .acting in; avvalve opening direction; a connection independent ofthe mainsteam ,sup-V ply line .serving to directsupply steam pres-A sure against said abutment mechanism in valve closing direction; and ableed connec` `tion ,leading from the lastgnamed connection to the oil connection between thevalvc and ,i

said steam space. l *y ,a a p a i l2. AIn a terminal check valve thelcombination of a sectional body; adiaphragm structure clamped between the parts of saidlbody` and dividing itinto a duid pressure chamber Y and an oil pressure chambergpimeans for 'conf ducting pressure l'luid to f the -iudpressure chamber; meansfor conductingoil under pres sure to the oil pressure. chamber; a valve seat controlling a discharge passage leading from the oil pressure chamber; avalve operatively connected with said diaphragm structure and Y a arrangedv to closeagainst said seat When'tlie total ei'fective iuid pressure `on the diaphragm structure exceeds the totalei'iective oil pressure thereon; and means for, disoliargin ya pressure liuid from the izluid pressure cham er tothe discharge passage ata limitedrate. i v A.13. In a terminal checl; valve; the combination of a sectional body; a diaphragm structureclampedbetveenthe parts of said body andy including tWo diztpliragmsWithA a center spacing meansV arranged to cause the dialphragms to'move in unison and with amargin .spacing means arranged to sustain and seal lpliragimA structure dividing .the interior of `the casiiiginto a: fluid pressure chamber and an oil pressurechamber; a valveseat controlling Y .iis

and including-two diaphrag-ins with a center i spacing means liavinga la'rgerarea-ofengagementiyithione diaphragm than'with the other,

arranged tocause the diaphragme to move in 1 unison and with a margin spacing means arranged tosustain andseal the peripheries of i ipo Yits *110' the peripheries of the diaphragms, saiddiaa the diaphragms, said diaphragm structure dividing the interior of the casing into a fluid pressure chamber and an oil pressure chamber; a valve seat controllinga discharge passageleading from the oil pressure chamber; and a valve operatively connected with Vsaid diaphragm structure and arranged Yto close against said seat when the total eective fluid pressure on'the diaphragm structure exceeds the total effective oil pressure thereon.l

15. In a terminal check valve, the combina'- tion of a sectional body; adiaphragmV structure clamped between the parts of said body and including two'diaphragmsvvith a center spacing means arranged to cause the dia.-

phragms to movein'unisonv and with a marginal spacing means arranged to sustain and seal the peripheries ofthe diaphragme, said diaphragm structure dividing the interior of the casinginto a fluid pressure chamber and an oil .pressure chamber; a valve seat controlv,ling a discliarge'pas'sage leading from lthe oil pressure chamber; ya valve operatively connected yWith saiddiaphragm Astructure and arl motor al pairl of spaced diaphragms con- -neet-ed to operate said valve, one subject to supply .steam pressure actingto close the valve 'and the othersubject to oil pump discharge pressure acting to :open the valve; and `,means Ifor venting the sp acebetvveensaid diaphragm 'arranged to indicate leakage of-oilfor steam.

' Y 17. A valve for a force feed lubricator system, the lvalve controlling the discharge of lubricant under the pressure for delivery into a steam cylinderl or the like comprising, ka

valve b'ody formed With anoilV chamber havling avalve controlled restricted discharge port, and aV steam chamber for connection with a'steam cylinder to Which'the lubricant is to be-delivered, and a valve for closing said 'port exposed to relatively opposing pressures in: said 'lubricant and steam chambers with the pressure insaid steam chamber normally prevailing to close the valve until thev lubridelivered, a diaphragm secured Within the body exposed to opposing pressures in said chambers, anda valve for closing said port fixed to said diaphragm, the pressure in said steam chamber' normally prevailing on'said diaphragm to close the valve until the lubricant pressurerises to a point in excess of the steam pressure in the cylinder.

19. .In a terminal check valve, the combination of a; body; a diaphragm structure dividing said body into a fluid ypressure chamber and an oil pressure chamber; means for conducting fluid under pressure to the fluid pressure'chamber to establish pressure therein;

means for conductingoil underpressure to the oil pressure chamber; a valve seat controlling a discharge passage leading from lthe oil pressure chamber a valve operatively connected With said diaphragm structure and arranged to close against said seat; and means for discharging to the discharge passage a portion of the pressure fluid Which acts to establish pressure in the pressure chamber.

' 20. In a terminal check valve, the combinationY of a sectional body; a diaphragm structure clamped between the parts of said `body and including tvvo diaphragme with acenter spacing means arranged to cause the diaphragms to move in unison and With a margin spacing means arranged to sustainA and seal the peripheries of the diaphragms, said diaphragm structure dividing the interior of the body into a iuid pressurechamber and an oil pressure chamber; a valve seat controlling a discharge passage leading from the oil pressure chamber; a valve operatively connected with said diaphragm structure and arranged to close against said seat; means for conducting oil under pressure to the oil pressure chamber; means for confclucting fluid under pressure to the fluid pressure chamber;

and means for discharging a portion of the last named fluid to said discharge passage.

In testimony whereof I have signed my lname to this specification.

GEORGE HENRY EoBERTs.

cant pressure rises to a point in excess of the Y Y "steam pressure in the cylinder. 18. A valve for a force feed lubricator system, the valve controlling the discharge of i 60 lubricant under the pressure for delivery into a steam cylinder or the like comprising, a valve body forming an oil chamber having a valve controlled restricted discharge port,

and a steam chamber for connection with a steam cylinder to Which the lubricant is to be

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