US1782009A - Exhaust-steam injector - Google Patents

Description

Nav. 1:3, 41930. N. T. Mcm; I1,782,009

y EXHAUST STEAM INJECTOR 'Filed uaon s. 1927 2 Sheets-Sheet 1 A TTORNEY.

Nav. 1121930. .N. T. MqKEE- 'y 1,782.0@

ExnAUsT'sTEAu-INJGTQR med auch s, 1927 z sheets-sheet 2..

,F5571 5 IKE 575,411

O xix e INVEN TOR. )VEA/ T. Mr KEE.

.ATTORNEY Patented Nov. 18, 1930 -vnrw-rian- STATES NEAL kT; Maxim, Aciv'iaitoiixvILLE, NEW Yoamnssieiion gio Tian sUPEaHEATnn coivr- Y- PANY, or New vomi, mY, 4- l j EXHnUs'T-sTnAi/i rNJnc'roR .i

v Appncauon ined Maren e, 1927.1 seriaijim@ 172,367; l

My invention relates` to exhaust steaminjecteis ofthe type in which the primary operating fluid 'is exhaust'jsteam' from a locomotive engine', and which may be operated bylive steam, When eXh-aust'steam is not available, by live steam throttled to approximately :exhaust steam pressure, such as is disclosed in UY. S. Patent No'. 1,531,004, granted March '24,1 1925,' to Malcolm Hard, et al.

In injectors of this type, arelatively small vquantity of high pressure live steam,-herein after referred to vas supplementary steam, isV generally used, both when the injector is operating oneXhaust steam and When it is being Operatedby loW pressure live steam,`vvhich Will hereinafter be referred to as auxiliary steam. Numerous controlA systems have Vbeen developed for bringing the control of the several steam supplies,fas Well as the Water 270 supply, to the injector, underthe control of the operator through the medium of a main control'valve, butin thesel prior systems, the amountof supplementarysteam supplied to the injector has been. a fixed quantity and in v such prior systems, one or more of the steam "supplies has been permitted to reach the in- Vj ector, ivlien the latter is vstarted, before water is supplied thereto. Such prior systems, further, have been arranged so that a plurality of steam'conduits has been required to carry the live steam used for operating the injector from the cont-rol valve, located in or near the enginey cab, and the injector', which is located Vsome distance therefromi l 7 The prese-nt invention relates specilically to a system for'controlling the exhaust steam, suppleme-ntary live steam and auxiliary live steam, and the Water which isY supplied to 'the injector, `and, the V,primary object of the invention is lthe provision 1 of a simplified control systennwhereby the -operating. steam supplied to the ,injector maybe conducted thereto through a single conduit leading from the main Vcontrol valve. A further object of the invention is the provision of a control systeinlin which the Water valve is opened by means actuated by the live steam entering the injector, this means being so arranged that no live steam can reach the v i' 5U injector untiflafterthe `Water valve has beenA tionis the provision of an'eXhaust-steani'control valve, which is opened bythe pressure .ofilive steam which has passed the Water :v'aflvefactuating means, this'.v arrangement insuring rthat the exhaust .valveis closed until `after the Water valve is opened. YBy" means of this arrangement ofthe control system,

a jet uponfstarting the injector. f

another object of the'invention' is the pro thereto assists in thefrapidiestablishment of openedi still further object ofj-/the invenvisioiioffmeans for regulating theiflovv of v supplementary livesteam to the-injector, such means being so arranged that the variation in thel amount of `supplementary steam permitted toflovv to the injector in no Way affects '1 the contrel of the Water supply, the auxiliary -steaiiisupply or the exhaust steam supply.

'A vFurther and more detailed objects'of the 'invention as Well as the advantages to bedeiivedthrough the use of my invention Will become apparent vas the fo'llovvin'gV` detailed descriptionof a specic embodimentl thereof bi'oceedsez-f i jector 'constructed in`accordance`-with my invention, said section beingtaken'along vthe line 1-1 of Fig. 3; Fig -2jis` afragmentary section, taken along the line2-2 of Fig., 8,and Fig. 3 isa schematic representation of the entire control system, invvhichV the valve mechanisms controlling the live steam andl Water supplies to-the injector `have 'been broken away from the main body thereof, inorder` that the entire control system vrriayjbe shown vvvith allof lthe severalelee ments thereof in their proper functional relation. f Fig; 3 is'included in order to `facilitate 4a ready understanding of the invention, and

V'it is tobe understood that this figure isr diagrammati'cally, rather than constructionally,

'accurate,the,relation of the several elements In the accompanying drawings, Fig. l is a fragmentary section, taken'through an inand their connectingpassages being as shown inrigefiand. Y A n 1 The injector proper, indicated generally v by live steam taken from the engine supplyV through a conduit in which is located the intercepting valve D, associated with theV 'main control valve.

at A is controlled t-hrough the medium'of the manually operable valve B, which controls the entire live steam supply leading to the injector, as well as the exhaust steamV supply and the water supply. An automatic valve C controls the alternate admission of exhaust steam or auxiliary live steam to the injector and said automatic valve 1s governed line, and carried to the'automaticl valve The injector Anis of the usual and wellknown form in which a housing 1 forms a low-pressure steam chamberor cavity 2 to which exhaust steam is supplied through inlet 3 controlled by the exhaust valve 4 and to which auxiliary steam is also admitted when,

exhaust steam is not available through the passage 5 and ports 6. Exhaust, or auxiliary,

steam, as` the case may be, is delivered from chamber 2 to the main steam nozzle.7, in which is centrally located the steam nozzle 8, supplied with supplementary high pressure steam through the passage 9. ASteam delivered through-nozzle 7 combines with water Vsupplied through chamber 10, in the water nozzle or cone11, from which it passes through a secondary low-pressure steamv nozzle 12 to the combining and delivery tubes of the injector (not shown). The exhaust lvalve 4, controlling the inlet 3 is-opened by Y .means of the iuid pressure actuated piston 13,

located within the cylinder 14 carried by the injector housing, the latter also forming a passage 15 leading vfrom the cylinder 14 through the chamber 2. The valve 4 is moved .to closed position by the springl, the closing action of which is supplemented by the pressure of exhaust steam admitted through inlet 3. Y

As the injector structure just briefly described is of a yWell-known form,.a further detailed description of the constructional features thereof is not deemed necessary to an understanding of the present invention.

/Themain control valve B which, when the injector 'is Vapplied to a locomotive, is

.located in or adjacent the cab thereof, com-` Aprises .a housing 16 formed'` with an inlet 17 to which live steamV is .delivered at boiler pres- '.sure from the turret of the locomotive. The .housing x16 forms a pairofjsteam chambers,

18V and 19, the former in communication with .the live steam inlet`17 and the latterin com- .munication Vwith the live steam conduit20 leadingto'the injector: Chambers 18 and 19 `are connected by apport 21, the circumference of which forms a valveseat` against which the `single main control valve 22 seats to close thel port'and thereby shut oft all live steam to the injector. .j Valve 22 is 'provided ,with an elongated stem 23 passing through 'a suitable' stuifingbox24 to theexterior of the housing 16 where it is connected to a suitable control lever-25, by means of which the main control valve 22 is manually'opened or closed. A second port 26 is formed in the housing 16 in alignment with port 21, and

this port is controlled by valve 27, which is attached by means of a lost motion connection to an extension 28 of the valve 22, said extension passing through port 21. The port 26 provides communication' between the chamber19 and the intercepting valve, which will be described in detail hereinafter.

means.. The water valve is mounted in -a housing 29, which in .F ig. 1 has been shown ascast integral with the injector housing 1.` `Obviously, this portion of the housing l'may equally well be a separate casing bolted to the side of the injector and, as indicated in Fig-3,

the housing 29 is a separate element which, 'i

however, forms av unitary assembly with the-fl main bodyof the injector. y y

Referring now to Fig. 3, it will be seen y.that thehousing29 forms a water inlet chamber'30'to whichwater is admitted from a suitable source-of supply (not shown), andan.,

outlet passage 31 leading to the water chamber 10 of the injector, the connection being shown 1 in thel diagrammatic representation in Fig. 3 by way of'conduit 32. Chamb'er'30 and passage 31 are connected by a port.33,;;;.

the circumference of which forms a valve seat against which the Water valve 34 seats to shut oft' the water supply to the injector. Valve 34 is provided on its upper face with an annular rib for Vthe retentionofal spring v35Yheldin a; suitable vhousing cap 36 and serving to urge .the water valve 34 to-closed position. The Y bottom of the .water valve housing 29 forms a steam chamber 37V in communication with the conduit 20 and the chamber 37 is'placed in communication with a second steam chamber 38 by a port 39. in alignment with port 33.

The steam chamber 38 is separated from the" `water passage 31-by a web which forms a valve stem guide 40 in valignment with ports 33 and 39, and which -has an openeended cylindrical recess 41, formed belowl therguid'e 40. Valve 34-'is provided with a downwardly extending stem 42, which passes through guide .40 and has attached to its lower end a piston.;

43 which, when valve 34 is seated, is located in the port 39. The piston 43 is made a sliding it in port 39 and as will be obvious fromvthe figura-the latter port is closedwhen the water valve is inwits closed position.'4 On lits ii-,visagooe cular; seat48iawhiohabuts against al Vcorre-v sponding Vseatifllwhen the piston is raised vto 4its :upper position Within-the recess 4l.I The :automatic .valve l is provided for s a Athepurpose of automatically shifting the in- V comprises threefaligned chambers, 44',v 45 vand 46, Chambeis44'and 45=being connectediby iport 547i and 4Chambers v 45V and?4 46 l being connected byport 48,;the latterbeing in alignment `with port 47.

'"ehamberBSywith which it `isiplaced in com- `miu'iic-ation bynieans of the snialljportv 49 which Iwill lhereinafter be referred .to vas a fhousing 68'attaehedto,theinaincontrolvalve Y housingl@V and` forming a .pair of'eha-nibers V64 and r65, the former in communication.-with-:90 'chamber l9bv way of the vvalve eontrolled chokel ]An outlet() vis provided at the -bottomfof chamber 44 whichserves topro- :vide feommunication".between this chamber andthe-'auxiliary steam passageV 5 in the'injectorby wayof-thepassage 51. z The passage 51- is sliownviii the' diagrammatic representation of Fig. 3 asa-separate conduitzwhich,V

'.ooviousl'y, -isnot required inthe actual 111-,

fjector, 'as shown in-Fig. l. v A

The lateralextension 38a ,of chamber BS'iS provided iwitli a lsuitable outlet 52, leading to :the ;passage 53- and serving Ito' :provide com- .municationbetween the 'chamberBS and the supplementary :steam passage 9 Vin lthe injector-proper. Thispassagehas been indicated inFig` Bby a conduit- S-siinila'r to conduit 51.

' 40 The. size of thelopeningat outletf52is controlledrby means ofthe rmanually adjustable needle valve l54, 'wliichfextends' nthroughl a lsuitable -stufiing box `55 to 'the exteriorothe 4housing. j

The chamber l of theautoinatic avalve :housing is rprovidedfwithf an? outlet rconnected by way of passage "56 'withfthe passage 15 in M:the injector propeigand this passagefhas also @been represented in Fig. Sby a separate con-` V duit; s i i A 'The' autoinatio'valve Geomp'rises a main valve-member 57' consisting of a--lower head i T58 located 1in' chamber 44 andian upper piston Vv,59 located in port"4,8V andV connected' with ...B5-head 58 bymeans .of a stem `'extendingr through thernortil and considerably smaller" `finwdiameter lthan the Ilatter. The `valve head :58 is -formed with .oppositely disposed'ivalve 'aces 58a and 58b,"=th'e formeriseating 'when 60 the valve is Ain Vlitslowervposition. aga-insta similar valve seat surrounding thefoutlet '50,

fand the latter whenthe' valveis xin its/upper iposition, seating 'against -a i simular Yseat Y formed around `:theqeort 47a. "The vpiston 59 is loose so that an appreciable quantity of steam maf,7 pass betweenthe piston and the wall of the port. A check-valve 60, guided inthe housing cap 6l', is provided with .an annular seat `on its lower iaee, which Ycooperateswith;` n a similar seat formed in theV bottom of ohaml U bei 4G`around portfi48. The 'upper kifa-ce ofV piston 59 is extended-so that-when the automatievalve member is in. its llovverposition, piston 59 willjust `clear the lower-"face ot 75 y cheek valvefOhand allow the latter towseat rIhe clearance betweenpiston 59v land :valve GOfwheiiatheformer is in itslower position and the latter"seated,4 isso slight, however, that upon iupwartl movement othe piston .so

v59, the valve @Orvis raised thereby/fand kheld `in vopen position duringthe time when the automatic valifeisin its upper positionfl Chamber 44 `is sur- 20 `rounded by a lateral extension` 38aof the Chamber 46 isl'provided with 'an opening Vwhich is connected by means :of CaLp'ipe-.GQ' 65 with the intercepting-valve l)..`

'The iuteroepting"valveDcomprises 'a i ofthe pipe 62. `/'Sha-nibesf 64and65iare placed iin communication-by theportf laround 95 which there is formed withinthe Chamber avalveseat. .tf the opposite end of chamber 65 there is provided a steam inlet connected by means of'pipe GYzwithth'e supplyfpipfewor valve@ chest fof the 'engine from 3Wliifchftlfie in'-i fino ject-or is-sup'plied withexhaust' st'ean'n'and i vthis inlet isV provided `withfaA :valve Seat dis,-

`:posed in the --chamber 65 opp o site the valvel `seat `surrounding vport 66. Chamberf 64 is providedwith an atmospheric vent-.fpipe-GS 1(,5

enteringl thechamber adjacent the port166. i

The intereepting" valve ,ni'ember/:69 oomprises a valvehead() located-insehaniber65 and provided with oppesitelylisposed-fvalve 'ffaees/O@and0bV andzadaptedfto move teseat ...i110 lagainst one or th-eothenoirlthe `i-:orrespondingvalfve seats ioravided .yinchamber 6'5.to

The valve headf() isl `eonnefetedvtoma suitably-packed piston Tlslidably mounted in thecylindrical o haln'iber .64"betw`eenl port'QG and eotor .is shut o-f main controlV valve Y 22 the water valve 34am 'the exhaust steam valve 4 in Vclosed;positioI Assumino thct the ensine isjrunnin@ and exhaust steam is available, the'foneration 1s-2 as tollowsiThe control handle '25"isfopened to liftithe control valve 2Q froinits seat'and it willbe noted thattlie mo-vement nei-mits theylifti of' valve without around the port 26, because of the lost motion connection between theV two valves. Moreover, the valve 27 is positively held toits seat by steanradmitted to ,the-chamber 19 upon the 'opening of valve'22, and the valve d 27 remains seated until the control lever is pulledY past the rposition indicated as open position, whenit is pulled from its seat as the control lever is moved to the emergency position, which will be described later.

VWhen'the control valve 22-is lifted from Y preventing the leakage of steam through the guide into the water passage-31. This action raises water valve 34 and. permits wa- .ter to flow to the' injector prior to the entrance of steam thereinto. This sequence of admission aids in rapid establishment of the' jet, as the first fluid entering the injector is 'the c old water rather than steam, which, if

` allowed to enter the injector first, would "tend to warm the latter and hinder the rapid condensation necessary to they quick establishment of a jet. After having forced'the piston 43 to its upper position, the live steam f supply is free to iow through port 39 into -v pressure acting onthe underside'of piston' chamber 38, from whence it flows to the high pressure supplementary steam jet`8 of the injector by way of the lateral extensionv 381 of chamber 38, the port V52, passage 53 Aand steam passage 9. Live steam is also free to flow through the choke port 49 into the lower chamber 44 of the automaticvalve.

Under the conditions assumed, live steam from-the engine supply flows through pipe 67 into the intercepting valve chamber 65,

and forces the intercepting valve member 70 to Vits seat around port 66,`whereby the `escape of 'live -steam to the atmosphere throughvent 68 is prevented. With the intercepting valve in this position, the live steam supply entering through pipe 67 flows through the pipe 62 into the upper chamber 46 of the automatic valve and holds the check valve 60 on its seat surrounding the` port 48. With the checkvalvein this position, the automatic valve lmember is held downward far enough so that the valve face 58b is unseated.

Live steam entering thev chamber 44 by way of port 49 is free to flowthrough thev port 47 into the chamber 45 and also to leak past the loose piston 59 into the' space above the piston andrbelow check valve`60, where itis trapped'by the lattervalve, ,which is retained on its seat by the live steam pressure thereabove in chamber 46. l The dimensions of the automatic .valve head 58 and the piston 59 are-such that under these conditions, theautomatic valve is forced bysteamv pressure to its lowerposition, where the valve face -58a is seated to close the outlet 50 leading to the auxiliary steam passage 5 Vof the injector.l

With the automatic valve in this position, steam is free to 'flow from the chamber 45 by way of the passage 56 lto the steam passage A15 in the injector,'from whence it is V,admittedto cylinder 14 to actuate piston 13 injector is automaticallyshifted to live steam operation by the action of the automatic valve, which operates as follows: When the engine is shut off, \the live steam pressure holdingthe check valve'6() to its seat is re-.f x

lieved by the absence of steam in the supply pipes 67 and 62, .and the pressure built up undervalve 60 by -leakage ypast piston- 59 0perates to lift the valve from its seat andrelieve 'thepressure existing on the top of piston 59. Underthis condition lthe live steam 59 anda'lso on the underV face of the valve face of they valve head 58, and the automatic valve is shifted to its upper position in which tlie'valve face 58b isseated against the wall surrounding port 57 to close the latter, and

the-valve face 58a'is unseatedto open port 50A andadmit auxiliary steam to the low press- "sure steam chamber 2 vof the injector by way of passages 51 and 15 and ports 6. The closure of port 47 shuts off the steam supply to the exhaust valve actuating piston 13`and thee' exhaust valve is closed by the action'of spring 16,- the pressure existing* in the passages 15 and 56 being dissipated byfleakage past piston 59 and valve 60 to the pipe 62. With the automatic valve in its upper positionI and ;the-L injector operating on` live steam, a `large quantity of steam is supplied to the injector ythrough the port 49, which is made suiiicieiitly small'to exert a throttling effect, whereby live steamipasses into'the chamber 44 and on to the'injector Vat a substantially reduced pressure, where it performs the same function as the low pressure exhaust steam. It

-will be noted thatas soon as the automatic valve is lifted from its lower seat the area Aadmitting both supplementary and exhaust Lsteanifor the purpose of establishing' ajet.

ilf', when the injector is operating on exhauststeam, the engine throttle is closed, the

\ steam in chamber 44.' `Y Aterthe" automatic acted upon"Liysteampressureftending to hold the valve in its upper position isincreased by the 1 area fencompassedby said 1 seat, and the reduction ofi the steam pressure in chamber 44 under these 'conditions is necessary in order that fthefautomatic valve may again be shiftedto its-lower position' bythe admission of steam to chamber 46. i.

If the injector is being loperated vvhollyv on live` steam and the engine -Ythrottle is opened,i-theinjector is immediately shifted to exhaust'steamV operation by the automatic valve due to theadmission of live steam to valve has been shifted *tov its lower position,-

the check valve-60jis`free to drop to its seat.

against `Which `it is thereafter held by the live steam pressure in chamber 46.

if the injector is sa tearwhen 'the engin@ Y;

islnot running, the automatic valve'is-immediately forced :to its lupper position bythe admission otv steam'tothe chamber 44, as,

under these conditions, there is' no pressureV existing inthe chamber 46.

Underfsome conditions itisdesirable to operate the injector on livesteam even though *Y the engineis 'running' and exhaust steam 1s i available, and in'order to permit this the inu tercepting valve is?provided, the operation ofVv Which'is aslfollows The operating lever 25 is in this case pulled past the normal open po sition tothe emergency position, and this action llifts the valve 27 from its seatl and permits live 4steanr toi'enter the. chamber 64 and act on piston 7 1, moving it `to the yright.

The `movement, ofJ pistonl` shifts thev .valve` member 7 0 to a` position Where face 7 Qa'shuts -othe live steam supply from pipe 67 and un-V seats the valve ifacey 70b'ito place the pipeV 62 in communication vvithlthe atmosphere by Wayfofiport'66 and vent "68. ,This operates to relieve f'thepres'sure in chamberr 46fand permits the automatic valve to shift `t'o'live steam. operating 'positionfin th'ez'same man-.-

nerasif the engine had been shutoff; f f

The amount of supplementary live steam` required is less if theinlet Water temperature is low than ifit is high andthe temperature variation of the inlet Water is suicient, vbetween summer andvvintei'l operatiomzto make a-material dierence in the amount oi supplev mentary steam required.: l'By the'provision of' the adjustable Vvalve 54 in lthe supple-l mentary steam passage, the quantity of sup- Y plementary steam used may be regulated without aectingv the admission of the other Voperating lues and in y'this manner the --most economicaloperation of the injector mayf'be The quantity Vof i supplementary steam" re'- f quiredk is also depen'dentlupon the pressureI at which: exhaust steam is availabl'ejand as dit?" ferent engines to which the same-"typefof in` jec'tor maybe applied operate at differenti average exhaust pressures, this adjustment? is va-iuabley in' setting the supplementary steam supplyon any particularlengine. VIn' some cases, lvvherethe engine "exhaust pressure is lhigh and the inlet Water-temperature is `very loi-v, it is possible to' operate'the injector Wit-hout the use of supplementary steam, and 'this adjustment :further permitsthe'shutting ofi of the supplementary steaml entirely in such cases, Without aiectingthe controlcroperation of the inj ectorj l Froni the foregoing description, it Will beH apparentthat by my invention* .I have profvided a cont-rol system fin which the entire operating mechanism with theexceptioniof i the main *control valve-and they interceptingi valve is locatedfatthe injector which results in a pipingl arrangement" considerably sim` pierV than' those heretofore required,"and that 1 lghave, further, provided`af`-controlisystem starting of lthey injector and f vvhichE `-perfnits of -theeadjustmentof the live -steam'su-pply injector.

n winvfuaher" te ap'pareiafthaafmanyf changes and variations in' the formffand: ar'-I f, rangement ofthe several elements 'shown may be made Without f departing VAfrom the Aspirit of the invention Which lis tof-be :understood as'einbracing all constructions which' ma'yfall l Within the scope of theappended claims.

What'I'claimis: -v 1- 1. exhaust vsteam injector controlsysl terno the type wherein ar` mai-ncontrolvalve located ata point'remote from the injector" governsl the admission of i livej steam't a pluralityof? Ifluid|` pressure :actuated valves fr forv admitting Water, exhaust :'steam, ,and livel steam'i toI the injecto'rj'f said valves-including anautomatievalve govern ing4 the adIri-issiony of auxiliary; livefsteaiii toy j L the injector, ,characterized by jthel provision ico ilo

of av single conduit leadingfromfsaidmain?A control valve and -:terminating-*fat said in.- Y jecto-r for supplying 'live' steam to operate' `j both the injector and-'saidfvali'fes,A a'b'ranclrl conduitleading from" 'said single conduit for supplying supplementary live steam to vthe `injector,aEmanually-adjust'ablevalvelocated I duit-controlled by saidv tautomatic valve leadl-v ing ,fromsaidf single conduit'to th'ejinjector, andfaithird branch conduit leading from saidv single-'conduitfto the fluid pressure actuated valvey controlling *the admission of f eiiha'ust steam.

afrit,` Combination with fm1 injector? te' Vwhich water, exhaust steam, auxiliary live steam and supplementary live steam are admitted, of a water valve and fluidpressure actuating means therefor, and an automatic .valve foicontrolling the admission of the auxiliary live steam and exhaustl steam. in

alternation to said injector, said water valve and automatic valve being connected with said injector and orminga unitary assembly therewith, a main control valve located at a point remote from said injector Vand connected with a source of live steam, a single conduit leading from said main control valve and in communication `with the actuating means for said water valve, and a connection leading from said water valve actuatingV means to said automatic valve., Y

3. The combination with an injector to vY, injector, said Water valve and automatic valve being connected with said injector and orm- Y controly valve located ata point remote from said injector `and connected with a' source of llivev steama single conduit having one end connected vwith said main control valve and termina-ting at its other end adjacent to'and conduit leadingfrom saidsingle conduit to the injector through said automatic valve. Y

4. AThe combination with an exhaust steam injectort having a mainsteam nozzle, a sup- ,t

plementary steam nozzle and a water valve, of iuid pressure actuating means for operating said water valve, a main control valve located at a point remote :from said inj ector and coniiectedv with` aA source of live steam, a single conduit leading from said main control valve to said fluid pressure means, conduits leading from said means to said main and supplemen-` tary nozzles,and an automatic" valve located in the conduitleading to said main nozzlefor preventing the flow of live ksteam thereoperatingAsaidinjector. .j l v5.; The combinationcwith an Linjector `to through when exhauststeam is available for steam and supplementary live steam are ad- '1 mitted, of a main control valve -locatedata` point remote from the injector and connected: with a source of live steam,j'a single conduit leading from said main controlcvalve andj terminating in juxtaposition to said injector,

, a casing associatedl Withfsaid` injector to form therewith an unitary assembly, said casing being provided with a pair of passages, one for supplying thek supplementary live steam to said injector and the other for supplying auxiliary live steam, a Water. valve and fluid ing aunitary assembly therewith, a main.

pressure actuating pressure means'therefor,

said Vmeans beinglocated in said single coniliary live steam passage between said single conduit and the injector for controllingthe admission of auxiliary live steam to said in- Y jector. f Y .y

6. The combinationl with an injector to which water, exhaust steam, auxiliary livey .steam and supplementarylive steam are ladev mitted, and a water valve for controlling the y admissionlof vwater to said injector, of-amain control valve locatedat a pointv remote romj 8U;

said injector, a single conduit leading from;

said main control valve and terminating close-l Y ly adjacent to said injector, fluid pressure ac-' tuated means operatively associated with said water valve located at the exit of said conduit to be actuatedfby the live steam flowing therethrough, and a plurality of branch conduits in communication through' said fluid pressure actuated means with,V said single conduit, one oiE said branch conduits serving to supply sup-i piementary live steam to the injector, a second of said branch conduits serving to supply, auxiliary. live steam tosaid injector, a valve loradmitting exhaust steam to said injector andiiuid pressureactuated means therefor, a third one of said branch conduits being connected with the fluid pressure actuated means for'said exhaust valve, and van. automaticy valvefor controllingthe admission of steaml in alternationthrough said secondand said third branch conduits, interposed' between said.v singleconduit and `said last named branch conduits. j

A7. The combination with an `injector to which water, exhaust steam, auxiliary live steam Yand supplementary live. steam-are adl mitted, of a main control valve locatedl at a point ,remote )from said injector and connect-VY ed with a source of live steam, anl automatic valvelocated in juxtaposition to said injector,

a ,single conduitunder thel .control ot' said main control valvefor ladmitting,livesteam to c fsaid automatic valve, a' Water valve for con.` Y. f trollingtheadmission lof water to said injector',` Vand fluid 'pressure actuatingmeans'asso 'ciatfe'd therewith, said fluid pressure actuatj I lng'mea'ns being located A'within which Water, exhaust steam, auxiliarylive conduit and 'between saidy control valvel and f said 'automatic valve.

pressure actuated valves are provided for consaid single 'j trolling the admission of water, exhaust--` steam and live steam tothe injector, a single manually'operated main control lvalve located at a point remote from said injector is provided for admitting live steam tosaid valves and anautomatic valve is provided for governing the admissionof exhaust steam, and auxiliarylive steam in alternation, characterized by said automatic valve being associated directly with the injector to form an unitary assembly therewith, the provision of a single conduit for connecting said auto,- mat-ic valve and said main control valve, and `the interposition of the fluid pressure actuated means for said water valve in said single conduit between said main control valve and said automatic valve.

9. The combination `with an injector to which water, live steam and exhaust steam are admitted, of a main control valve connected `with a source of live steam, a single conduit for the entire live steam supply, said conduit leading 'from said control valve to said injector, a water valve and fluid pressure actuating means therefor, said meansr being located in said single conduit and preventing` flow of steam therethrough until said water valve is opened. c

l0. The combination according to claim 9 in which said .water valve actuating means comprises a piston closingsaid conduit when the water valve is closed, and movable by the pressure of steam admitted through the main controlvalve to open simultaneously the water valve and the conduit. n

11. The combination with an injector to which water, supplementary live steam, auxiliary live steam, and exhaust steam are admitted, of a main control valve located at a point remote from the injector and connected with a source of live steam, a conduit connected with said main control valve Jfor supplying auxiliary live steam to the injector, an automatic valve within said conduit for conn trolling the admission of auxiliary live steam and exhaust steam in alternation to said injector, a conduit for supplying supplementary live steam connected with said main control valve, and a valve located in the suppleinentary live steam conduit between said main control valve and the injector for controlling the flow of steam through said supplementary live steam conduit independently of the flow to the auxiliary live steam conduit.

12. The combination with an injector to which water, supplementary live steam, auxiliary live steam, and exhaust steam are adlmitted, of a main control valve located at a point remote from the inj ectorand connected with a source of live steam, a conduit cons nected with said main control valve for supplying auxiliary live steam to the injector, an automatic valve within said conduit for controlling the admission of auxiliary live steam and exhaust steam in alternation to said injector, a conduit for supplying supplementary live steam connected with said main control valve, a water valve and fluid pressure actuating means therefor under the control of live steam from said main control valve, and a. valve in said supplementary live steam conduit between said main control valve and the injector for controlling the flow of steam through said supplementary live steam conduitindependently of the flow to the auxiliary live steam conduit and the wa- Vter valve actuating means.V

Vi3. The combinationfwith an injectorl to which water, exhaust steam, auxiliary liv'e steam, and supplementary live steam are admitted, of a main control valve located at a point remotetrom said injector and connected with a source of live steam, a single conduit having one end connected with saidL fluid pressure actuating means preventingr flow of steam to saidpairotconduits until said water valve is opened.

NEAL T. McKEE.

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