ClaiM IS: 1. A regi@indiDg,v-,,.Ive coiiiprisiiig, t valve eltsi-Tig h,,tvii-io- two opposed valve seats, a v,,tive member i-no'vable to selectively eovei! aiid uncover s,,tid respective Vtlve seats to 40 OPen ,tnd close ip-depenclent p,,,,ssa@ze-, v, v,ilve stem opertble t6 adjust said v - .Ive r@iediber to and from s,,tid respective vtl,!.ve seats s@)id valve member beinu i-otat,,tbly mounlecl relative to saicl valve stem a 45 C]Utch member to normally rotate said vdlve niember from stid valve stem @and iiie,,tns operable tlirough piessuro of said II-ieinb er upopone of stid. vtlve S6,tts ,- O yield tnd tllo"T relttive motioii between 50 sgid cliitel-i m,mber and vtlve stem tiacL cqabl e s,,tid valve'stem to rot,-te iiidei.)enclcntlv of said valve meiiiber. 2. A re,,Yr;.nding v,,i..Ive coi-iipi@isiiig a v-,Llve casing having tnvo opposed valve se,,."s, a 55 valve nieniber iiiovtble to selectively cover ,Ln , cl u--ncover stid respective vtlve seats to open tnd close independeiit passii,ges, a valve sten-1 operible to tdjust said valve iiiembei! to and fro-in said respective N,,,tlve 60 sea4@-s, a driving member carried by s,,tid v,,tlve stei-ii to @Interlocl@ -vvith Lincl rotaie said valve ineiiiber, aiid mea-iis to yiel-,-Iiiigl3r liol(i said mei-iiber alid v,-,!Ie meniber noi@mllilly ii-iterl-ocii:ecl, said yieloin(, me,,ins 65 yieldiiig atitoni,,itic,,tlly to i@el(,ase s,-)id interliocli:id- conneet-loii when the fric,U-ional zn engaeeine-,it be-b-NVeen tl.-ie valite iiien-iber and one of said v,,tlve seats approaches a max,@mum. 3. A reo-rindino, i,alve coinprisin.g a valve 70 casiii(y h@Lvi-.i-,- tnvo oi posed valve seats, a zn p vq-lve mei--ub(,i- in(,vabl@e t6 scielltively cover Pi-id uncover s,.tid i-especti-@,e seats to 0-I)en ,t3id elose iidel)enclei,,t p,@tss,,tties, a vllve o-i-)ei,a-ble to ,LZljust s,),id v,,tlve iiieir,'rier 75 to a,,-Icl from sa-ici rc-SI)eetive valire setts". sIli6' va'lve rneiabei@ beino- i,ot,,tt,,tbly inou-nted r,.,Iative to siicl vilve stem q.-tid cli-i'L-lc'ii to rele,)se s@iid -v,,ilve iyiei-nber III eitliei- d-li@ec,L-ion -.L@'-L'oiii rela'U'-,oii 8o ,,,aid v,-Ive s@em iah-ii th e friet@on,?,,l eii gag-,meiit of said, vilve Tneiiiber Nvitli eitl-ier O-L s,,t".d valve seats appi@oaches % RI"tximum. 4. A valve conipt,.-,j-,io- a N,alve casiiic,- '@-.av@@tig two OI)p,)secl.vtive ,,,eats, a ,,alve"ilielli- 85 ber i)-,(,vtble to cover ,tud Li-@qcover slid regi)ecti.vc@ AT@q,lve seats t6 op,-iclow iiiclepende.@it ip-,tssayes, n-ie,,t,.is'to rq 0 I I fr In qa; s,,t'd vtl v(, m-- , b r 'o nc o cl resi)ective v.-,;Ive ald to i-(,ta,te saicl val.vo go iiiemb et.- Nvi.4.-h one of its valve faces in coii- I tact ,vitli o-@ie of @ S,,tid vtlv-. seats -Lron-i tl-io ex'ei @ior of sq-id v@)lve casing and iiieaiis to yiel,- 'tiii-@y i.c,,Iease said vi,lve ine--.iiber in eitlie@., diiection froin @ts rottry driviiio,@ re'--atioii 95 iilieii the fric ioiittl eiigageiiient of said vi!Ae witli eitber of said vtlve seat I s apI)roac hes a iiiaximuin. 6. A i-egi-i-,lding vtlve comprisin@,, t valve casing Jiaving two, oppos6d valve seats, I 100 valve i-neinbev iiiovable, to selectively cover and lincoi7er. said i@esp,@c@ive valve seats to open and close independent passages a valve stem oper,,tble to adjust said valve member to ,tnd fi-ora sai@d respebtive valve seats, 105 s@,id v-alve member bein(y rota@@ablv mounted relativ e to stid valve stem, a@driving member intei-posed between said valve - -T@qember IV and said va e stem to normtily rotate sai-d valve. meinber in eitbei, direct'lon 'Lrom said 110 valve stem, a-,n-d qtitomatiep.Ily aci@uated meellt nism 'L-o i-eletse said v--Ive member from driviiig relation -@vith sq@id valvo, stein wl,,en the frictioiial. eng,,t,reinent o-P said valve n-ieiliber w;.th eil@her of- said valve seats 1115 aDi3r oacl-ies t m,-tximutn tiid to -utomatically re-eno-,tge stid vb')-ve incinber@ in drivin(y felttion ivl'cli said VIlve stem when the iri.etioi i,,tl o'L said valve membei, with eitber of said vllve seats is - decreased. 120 e compi-ising valve 6. A ileolriiidino- x,alv @i I casiiig having two opposed valve seats, t valve member movdble to selectively cover and Lincolrer S-id respectii,e i7alve seats to open and close independedt ptss,,),-es, metns 1.25 to adjiist saicl valve ineinber tolntnd froni Isq,i.d respective vtlve, seats tn(i to rot,,ite siid vtlie inember in fi@.ictioral contact -with either of said valve seats wh-.n said valve moll'ib er is beino- applied to and removed 130

4 1,711,593 froi-n said valve seats from the exterior of the v,,tlve casing, a,id means to alitoinatically yield and allow relai@ive inotion in ei-'Uher direction between said valve stein ,tncl said v-,Ive whep- the closipg tension o-.ii said va,lve me er appro,,,tches a 7. A i@e,(Yrii-idi-tio- vtli,e co.,iip,-i i,.ig -,t v,,ilve n -- 's casing b,,tving tn@vlo ol)posed vi,lve s--,its, ,t v,,,tlve meinbei, movtible to selectiv-llv eoi,ei10 ,tncl tincover s,.tid respe-,tive V,,,Ive se,,,.It,-s to open ind clos(, independent passaires, a valve stem 0I)el-"Lble to tdjiisC said vtlve mem,oer to @incl froill said respective vlll-,Te seats, means intei-posed be'u-iA-ee-Li I@,,tid i5 member and valve steii-i to i-nit-Ltlly Ll)pl-.y said valve iiiejn'@@er to ei4,-l)er oi' said i,a'ive sco,ts with aiie'i-di-i(I teiis@ioii, aiid t dliATIIIQ' men-il)er n-ioL@nt(-@d upoii i-.id rotat,,tl)le ,i,'Lli said v,,tlve stem, aiid yieldiii(,Iy liel-,l 1'.n cli@ii,- 20 in- relttion ivith stid vtlvc to rot,tte sa'ld valve iiieiaiber iii friCt,Loiiil with eithei- 6f s,,iid ialve se,,i,'U-s - wheii saio, valve -neinber is bei,,i@)- api)liecl IL-o ai-id i-emoved from s,,i,id seats, aiid to 25 malically yield tnd i,ilo@v re]., tive i-iioi-ement betlvveeii sti(I valve steiii -,ind s,,iid vtlve meinber when the closing tension on said valve mei-nber al)pro,tches i inaxim-Liiii. 8. A @-elf (yrindino- vllve COII'Iprisi-,-,g a valve ctsiiig havi-ug a valve se,,,,t, a valve 30 stel-i-i oper,-ble froin the exteriol! o-L, L-iie casino- and ipovible endniise ]"el tilto to III a , 0 casiiig, a elliteli iyiejiiber cai@i-ie(I i@i(-idly rel,.tive to the inner elid of tlie NI-alvl:el steii-i, a i,,,i,lve ad,,,,pted to sai-cl v-lvc@, @eat to 35 cl,)se s,,ticl valve port, sii(I v,-Lille bc,,tii(, provided witli a cltiteli. riioi):ib(,r lield 3Tieldiiigly in en-@i,geiiieiit ivith tlie cliitch ii-iembel, ol-i said valve steiii) s@Lid valve steiii bein-,a(lapted to i)ositivelv 'Lorce Sfticl v@i;lire 40 I fltild I)ressure into coiit,@tc'c witli siid IT,111-@To seat. 9. The coiiit)iii,,Ltion of a valve hen,cl @iiid ,t valve stei-a ad,,tpted to noi,i-ti@tlly rot,,ite to()-ethei-, tiid iiietns ol)ei@,able tlii-6ii(yli the 45 frictioii,,il of the valve heid with L v,,tlve seat to catise the hetcl ai-id stei-n toro4l-,-,to i,- idepeiidently. In tclstimony whereof I li,-Lve affixed my sigiialt-ure. ISRALA L B. GILBERT.

Patented Ma 7 1929. y UNITED STATES PATE.NT @OFFICE. ISRAEL B. GILBERT, OF CI@VOINNATI, 01-II0. REG-ttINDING VALVF,. iALry itiventioii i,e,lates to iiiip -,--ovements ill v:@l,lves. Oiie of i'u-s objects i-s to provide tn i-cg-,-.irdiii@4 or sc-if-o--.- indino, valve a,-i,,,,pted to loiiu con'L"Iiiued i)erio,,'ts of use t@ @s4eL)iii@ lict, iNaLei, aiicl otli6,11@ fiuid concl,,,ii't-s. xiiotl@ioi- - 'f,)ject is to i)--ovi@'te a self gri7idiiig i,a'ivcaciil,@Le(IL to I griii(I uiid(@,r pressui-e of t,be -@ali,e Lipon i6,@ seat. Another object -LIve I is to pi:ov"(Ie tll illip-,L-oved v [ItlNlillg 9, io vltlve scal@ to elo,,.,@,e the cor,,@',uit iii which it is f, D-iouiite(I t iri,ii7e sea@t to eiic o i ,iny ol' :fltiid thi()u(yh the sti,@lfoi@- tioiif-)- the st.eiii, ai(I to onbox '-o lie i-epaefi:e cl v, ithout off tile i'l@)W Oi- lit,ii(L tlli-oilo "I the coiiand iiiiprov(,, 01, tlio upoji etch of lus seats, Aiaotlier.objet., is to. pi@ovilde I ail iiiipi@o-ved valvo striiettii-e comt)risi.-ii,,, a vaive 2o adapted to seat ,tt opposite faces lipoii sep,,tral'Ic,, valve seats ai,,d to tvLtoin@iuie,,Llly i@e,gi@ind itsc@l-f- 'Tiitlo operative coiitto'c, Ai7ith each of v@il-@,e ,,eats. ialy iiiventioii also coin-, pi-ises ce,,i,'t,aill @lctiils of T-oi-i.-i, aiid coinbiiit25 tio,-i o@i@ collip6iient,,,,, @ll of Nv'ilich Avill be fi-illy s,-t i'oa.-tli iii the cl , escriptioii of the ,iccoiiip,,tii37iii,,,, d.-aivino--s in wliiell: Fi(r. 1 is ,, cc--iitral Aertictl se,-.,tioll tlii-o-Li,,Yh a vilve eiiioodyiiig iiiy ii-iipi-ovemeii'L"". 30 F@l,,,. 2 is a perspec'L-live view of one of ILI)(, atitoiiiilti(@ cliitell or cotipliii(, d(@caclied. 3 is I sectioiial (letail the ol)ei,,ttive li'leii:ibei.-s of Fi(-. I iii t differen't-I ,,5 positioii. The ac,omj)aii),,t.,)o, di,,iNviii(,Ys illtistrate th(,, pj-(@i' i,@-c-,d eiiibo ;inenl of iny inv li@ioil, i wlilcli l@,5 "]I(,, v,-,I,ve sli,k@.11 or ca@,il'19, to opposi'Lle ciid@,, of Ai'llicli pipc see40 tioi@s ai@-e a(l,.tptec.1 to be coiji-tected by iiieaiis of @,,crew tl,,Ile,,)ds 16 ,tiid I't. The valve casilio- l@@) is p.-ollicled Nvitli a P,7,rt'-Ition pla'e t@ 1 8 tlii-oti,,Ii ivliieli is q, valve port 19 encit-cleci by,,,t i-n,,tiii v,,tlie sc,,,tt 20. @ A bonnet 22 45 is @'iireaded ,tt 24 'L@O the vtlve casiji(- a,,id t,ie lo-vver inntilar @cige cf t-,he bopiiet i,-, providecl v,,it,li aii a71iiiil.@ii- vtllvc- se.,tt 26 to eiiable ilIL co-@ iiiiiiiiiicat'ion betvveeii tli-e v.,tlve:ehti-ili.)er 28 iiicl the chi:mbei, 30 o,f the boiin(-,t to b@- 50 cut off- -,-,,hen the valve j'iLe,,id 32 is @tpplied to the voli,@e, s@e@qt, 26. A vltlve slu-ein 34 is thre.-,(Ie a@ 35 to I-,lie I)o--tine'L 22 so a,,, to f-eed the valve, steii) ciicIAN7ise i-el,,itive to tho, boiiiie'c ivlioll L-lip, V",Ive S,@,iii is rotated. A giin-I 36 55 to the ii])per eiid o-f 'u-Iie boiiiiet to pi-ovide -,L chambei- or stuffiii-- bo-x 38 i-ii Applicat-.oii filed October 21, 1926. S,eriai No. 143,236. VTliicli p@a6li:ill(r iiittei-ill is coii-iined and coinpi-e-sed t,o Pr,--,Zcnt fluid leali:,age past thp, ptelizin(Y,iii tl-ie stLlyTino, box 38 @i-ound or L, en 1101]Lg t!--ie valve stena 'Lo the exterior of the 60 17,@tlvc- casin, ,t-rd boniiet. Ln @ The v,-,lv6 heid, 32 is pi-ovded with ,,n aniatilai@ Arp@lve - 'Iac,-, iiaike col-@l'tact itl the inai.n, valve seat L),O tb close the i)oit 19 ancl l@7itil t itilii@ vtlve - 'ace 42 oppos'to the, 65 ialite face 40 to clo.@@e co,,itq@ct Nvitli the IV v,), e seat 26 '@o pi-eveiit the escape ()f ally fluid lilto t'lle bo-ylilet or past@tfie I)aclcin- t@ tlle extei-,'@oi- c)'L tiia.Lonnet tiid partietilarly@ to efi'ecttial? s clo e oi't ,ti-id pi@even' the 6scape 70 of Jt@lu;d @ri-oiii the valv,,@ to tlle boniict wlii'le the I)tickin(y is bei-Ti,)- ieiiioved filom 'L@lie box 3,8 Plid i eiiev@- od' or replenished @hei@-eiri. T,'i(-, valve heacl 32 is'inounted relative to 75 LIle VIlve 20 'Ili-id 26,aiid tl-io ipner end o;, tli(,, i7alve st,-m 34 iii the mantb(, val-@,e head 32 is I?rovided witli a,n tTiii-@ilai@ sci-eiv-tlii-eaclecl fiange 70 to wl)ich is a clil.Illibe,.-e,(l (.,ap 44. The cap 44 is so fii-nily cn the flaiige 70, ajici is pi-eflocl@(,cl tlic-,1,6to by illeaus of a set,@ci-ei@ Ireyl 01@ sijuilar known n-teins to pi-eA,eiit ttie cap 44 b-ecoml,- i i iiscrelled froill g @tliin tl-ie cap 44 is t tubular 85 Sl.eeve or iii,e@iibei,- 46 h,,ii7ino- a lii-_yiited n'loveine@nl@ witlill-I slq,id cip endivise, of the vaiv(,, - Lilde 47 The sleeve 41,)' hqs a slio r t@ (,,-I to tipon the eiid of- 70 to Iiirii,L-1 it@,, i-no-\,einei-it etidwiq. '-lie ittlve go 1, of u 0 , clii@(,ctioi -'lie ol)p er. Steiu in n(, -i, and u ositc (I of sl@oeve e-.,i(yao,ino, the iniiei- fice of the th(, oppos.ite dii-ection. Th(, ,;Ieeve 46 is @,tiso provide-Id Vvith a recess 48 between s,,tid sleeve tnd the 95 valite ste_yn. The rec@lss -18 Serves as It housin,@ - foi-- a spriiig 49, tlio upper end of which .9,-.,,ts agiii,@,,t the itee ol@ 't-IL)e @7f e d o- @i-h,o cip 44 aiicl t'[,.e lo,@,7e,- eiicl ol' the spring se@its ilpo3-1 ail slio Ide u r 100 43 of tjie sloene 4',6 to yieldiiigly Pi'e,,@s the sleeve fi-o-,ii the eiid of the ctp tnd towai-cl the vtlv(@ liead 32. The er)-d of th(@ sleei,e 46 toAAIltrd thc, vali,e ho.@id 32 is l@rovicl.cd with It.@sei-ieg o-f clill'i ftees or te(,th io5 58 v@lliieli ai-e adaptecl to l,ieldiiigly engage opl)o@,@ite ei-icls of t pin 60, VN,Ilich is. carl@if,-d by tlle v,.IlvG, steiii 34 iA7itli Ol)- posite @llf!S' of sai(I piii proje(,ting beyond -the cylii-id@ ictl f ace of tlie,@ valve stei-a inlu-o po- lio P,-I'U-ioii to b(, eiigtggd by the teeth 58 o-@ t@ie sieeve 46. A scletic)ii '@5@ of the v,,tlve heact is (@@i,p 44 Iiiii ts its i i

2 1,711,593 in Posi'Lion to be ong-,Lged by the encl of the valve sten-i 34 to i'@orce the valve 32 ri-icll,7 aT-i(.1 positiveli, against its seat 20 and presstire oi2 a iluid tendin- to p@,.ss lipiVI).i-dly ilirou,,Yh the valve poi@t 19 Nvhich directioii il'i ivlhicli to face the vllvc, in its con(liii.t. A in or s(,t sci@env p 62 c,,tr@-ied by 'c@lie c,,ip 44 entcrs a slot or kev-Nvq-y 63 in ilie ou,ter of the sleeve 46 lo 10 pi@('I,G-nt the SleelTe i@otatin- rel,,it-[Ve 'co the cal) 4@lor valve heact 32, b-i-,t DCI@lDiLting tl-i,-, sleeve 46 to ni6ve eiid",ise -w@itliiii 44. 'vvliile tli,@ v,,ilve liea(l i'il-) is@ (@)iit of coiit'llet 'th 'ts 4 9 To ivi I ,' se-,Lts 20 ,in(I 26 the r(les y @IL 15 tl-ie t@,,e'Lli r)8 of tlic, slee,,e 1-6 yiel(Tiligi i o en("Igel-rlent IN@itli the p'ill 60 so IL'il,,it t'iie elid.s ol-,Llle piii ocetipy t-wo o,,;' -Llie d,-,pi,essi(,iis betA@,,e(,n the teetli r)S. The sholilfter 47 is III contact with the eild )f tlio flaii(,,,@ 20 'To before the end o-j' the 34- con"-"Llcts 'th t' @vi tie i-alve face '@2, li.,icl ti-ie slep@ve a@id val-N-e h,@acl i-otate ivitli valae ste-iii. Cover,iiig the period wlien the A-,,tlve steiii forces tl-ic, vtlve, face 40 iito coi-it,,tct -@vitli the v,,tlne 25 c@e,.tt 20 ,tg,,,iiist a-,i upnvai-d pressui,e from the fltiid, the first co-@itaet of the i-alve lie,-,d s ,vith the eat 20 teiicls by friel '-ion to prei-otatioi-i of- the valve iil3o-P. its seat o,,@ AvitIl tlle VaIlTe S@e@@D, ivhile ,it 'Ulie sltiiie ti,-ne 'O the ciin teg-tli 58, due to this iesist,,Lllce, teiid to climb ovei- tlic, ep(,is of 1-@he pin 60 as indicatkt in Fi(,, I @ind this to-z"icie,nev for the teeth 58 to clii-rib o-@Tei@, -@,lie piji 60 is resis'L-e,-l by the spi@ing @[9, iihi.eti in 3 i-) tlii@n rea,.,,ts 'L-o caus(,@ tlic vftlv(@ fice 40 to IIlove to t lilylited exten'L-, rotatably Lipoii aiid iii contact uiider ii-iodei@ato pressi[i,e -%vil--h the Yalv(, -zzea'Ll 20, aiid thei-eb3T to automatic,ally giind or t.lie i,alve f,,ices ,ind 4o k6ep its faces 40 lincl 20 ,tLitomati-,,-@@ly clean, smootli, and fi@ee fi-oiii (lir'L- or foi-ei@@ii ni,,Lt,- ter, ',Illcl Lo pi-ONreli'- oi@ cli,,),iiiiels boi-.ig wor,n in either of the f ae(Is 40 or 20, diie to -N@Iii-e-di-,,wi7i(,- oi.- tci@io-,i o f the 4,5 'iliiid titicler pressui,e across said -IL-,.tces 40 @,ind 20, Nvlien the i-aii-e is pai,tly ol)cn. -@,s t@lie italve eloses, tt-io friction bt@,,',I-we-,ji t.-io 40 aiid 20 inerc,,ases pi@og),Iles.@@ii-ely so tht@L the r@)t@itiol'i 01, (Y'riii@til)LO' @@ction of'tlie v,,tlve n 2m 5o faces occurs ivhllc, the pi@essiire becweeii the f aces @j'O ind 20 i's ol iiioclerato- de(yree, and ceases as sc,,on as ti@ie pres.,@iLre I)o'u--@veeii tle v,.tli7(,, head aiid its geat 1)ecomes si-ifi'icient to caiise tlle spi-iiig 49 to yleld ,,,nd the teeth r),r) 58 to ciiiiib ovei- tl,,e I)iii 60 iii pi-efei,ei-icc@ t',) pi.-opellidg tlio valve lie,,id i@otati@,ely -Lipoii its se,,tt. BNr this ,Li,ran(,eiiic-nt I ain ciiablccl to find fiie fa.ces 40 z!ai-icl 20 iiiidqr concli9 tiorts ad,,tl@)t.eO@ to porfe(@'u tli,@it 6o is positive do),@,nivii.@d pi@essul-e oil fe(,d o-f tlio vall@(, stcin ,i(-v,,tinst the vilve beacl to 6losVI;lv(" -,L(-"Iillst an 1,11)vv,,@ii-dly ql. opposite zn flii'id pressure, ,ti-id t votarv or griiiclin, aeb& t,i o t@lie fices of ti,@e valve lieltd l,iid 65 valve seat iihile held positiirely in coiic,,ict as- distino-uished fi-on-i ieldiiigly Or resiliently in @ontact. y 11'rlieii the valve liead is retracted from its seat, a. grindiiig action in a reverse direetioi-i -tnd Linder like conditions occurs be7o tween t-l-ie faces 40 ancl 20 j List prior to the lifting of the face 40 a-vi,ay from the face 20; Frorii tiiiie to tiiiie one or i-liore of the teeth 58 cli-i-nl) a-nd slip past the pill 60 %i@lileli results i-@l the Nalvc changiiig its 1)0- 75 sicion i-ot,,itively relalive to its seit 20 aiid the stem 34, so that the o,-indiii- ael-ioll is zn- '7' u eveni.y disti-ibut6cl q,botit the cii-cumference of t]-@e i,alve faces aiid tli-- cont, et ',,ices a 9 ,Ii.e kept tri@te iid iio Itigli places or irre ii- so lii.iti.es ire allowed to dei,elop tlierei,,i. The operatioi-i is as follows; wlien tbe, valve sueiii i-, rotall-ld to feed the @&tein tolnar(l '61ie 1,)ort 19 the valve head 32 feeds YNitli tli.,, s@eiii I)eiii,)- eltitelied yi(,Idingly therc,,to 85 by t-lie pi-,I 60 eii(rao-in<)- -the teetli 58, -,nd zn cn I-) Ile'Lct yi.eldiiigly in en-a,(Yeiiient by the s@I)rin(, zn zn 49. As soon a th6 valve face 40 en-a(yes tho. val-ve -,ea'u 20, -i'riction betiveeii the f-aces 40 ,iid 20 tends to pi@eveiit r6tat@ion o'@'- the oo valve he,.id 1-lpon the seat 20, ancl restilts frorri eii-,agenient of the end of the valve steill ivitli '-,he, section 72 of the valve head 32 to develop ,t, positive pr-Issure betiveeii the faces 40 ,Lnd 20, to hold said f.-Lee,-, iin- 95 vi(,Idiiizly in contact and vvith progressively inei,easiii(r pressiire as tli.e A,,,tlve stein is progressivel.y i,ot,@ited to locl@ -,Ili6 valve head to its seat. The fi-ictional contact betineen the flcos 40 tiicl 20 calises the spriii@,y 49 to ioo yic-ld to interiuit-tently uneltitcl-i the \,alve lieftd 32 froin the vaINe stein at the teeth @8 atid pin 60, but not until afl,-er the teetli 58 and IDin 60 have acted to rotflte the - L'ace 40 to a Iiiiiited exteii@'@ uncler moderate posi- 105 tive pr,,,ssiire relatine to tl-ie face 20, to thei,eby tfid true the s7Lirfaces 40 and 20 ,tL eich opera,Lion of the valve, a.,id alteriiatel3T in reverse directiot-is. At the ex'L-renic inolteme-nt of the valve 110 lieid 32 aiia3T fi,om it,,, seat 20, the v(,tlve fi,co, 42 i-tl,-@kcs - ,ontact witli the valve se..,tt 26 to cut 6ff corqiiiunic,,).tion bet",Clen th(@ v,,tlve cliambei., 28 @tl-id tl)e bo-.i-.iet ch,@)mber 30@ tind the I)iii 60 beino- hel-d by t,he spili.-ilr tD tn 49 in en(,,,t,-eitient the 'U-eetl,@ 58, tlie, spri_nol 49 is comp@essed to a o-re,,tter or less exten't@,ifter the vtlve seats 42'aiid 26 enga(ye, @kliile the vilve li@-.ad 32 contiiiies Al-0 rotate -",itli the V,,.Ive steiii iiiider iiioder,-.t-@ ])res- 120 sur(@, oi- the valve upoii its seat, to Lliciel)y self grii-i(I the V,,tlve faces 42 ,tncl 26, substantiilly is lici@(,tofore described. Ultim,,ttel, IT the llpl)er cild 6f the sleev(,, 46 will ])ositiiely eng,,i(-e the in-ier 'Lace the cap 4,1 tO 1)0"i125 zn tively clamp the valv Ilead v,,tlve seat 26 substiiitially as iiidic-,tteci in Fig. ,o IlThere ,i rel,,ttiiely ligli'u- sprinu 49 is yed, the teeth 58 fn,@), be riiade to climb the pin 60 diie to fric@t-ion@il en5y@i,ge- 13o

n-ieiit bctnveen the valve f aces 42 ancl 26 beI foi-e t@,e eiid of the sleeve 46 en(rages the inner face of the end of cap 44. Upoii releasi-@i(, the valve heacl 32 from -L,.s 8eat 26 a grincling action in a reverse directio-Ti is hact under iiioderate presstire until '@-lie valve hel@icl is fr-,o 'Lrloin the sea'u 26. The valve is thiis loca'L-,ed in the i,,-Liv6 ch@,tmberintel,med;,,t@,e of-@tNv@) v,,ilve S(lats,, @iiicl lo is c)perable froiii the exte--,io,-- bv valve steni -,tiici siriiple ',tiict iloii,,tldje ilieltils to seit 'ulle V-,,.Ive@he@)d firml3, iipon v,,tlN,e seat, and to bftve aii ai--,tomati6 o@i,indiii- Letio,-i under condi-ti-oris of pi@essii@-e of 15 the vllve tipon 4LS seat ,tlso -. gi,indii-,,,@ Le tion iii ol)posite OLli,e,,tioris iipoii each s--.tt. The vtlve is thtis aclt,,)ted fo-@@ 1-ise over, long periods of coiitiiitiolis s(@,rvice, tiid whei-e ti shu'Ll-clo-",ii of tli-- for -rep@iirs to 20 th6 V-)Ive ivo-Lil,-l bc, diffictilt or objectiontble, a@@id to c-ontii-iuousl.y iiiai-,itaiii botli vltlxe se,tts tncl valve ftees@ in -per-@lect o,,Dei-ac'L%,,e eonditio.n -LnCL to 'u--',Ic,, Sttifliii(y I)ox beinu repacli:c,,cl ivhenever requirc@,ct withoiit 2.5 lDjtirinp, the opei@,ttor or renioving the 1,-e V "I or @interi@uptiiiu the -Lise Of tlle ilaive. The v-)Ive is also tdapted to b,, ,Ls ,t -Lv@-oway vtlve, w,iii-cla may be att,,tined. for -'tnstaiiee by co-unectiiig a secoi-id oi:f-'Uali:e pil)e ol. blow-olt cocl@: in pl,,ce O.' the pluo- 74. n The ,tpptirtttis liei-ei@i -,h6wn aiid describc,d is c,,tpable of colisider@tble inodificttion within the scope o-f the eltin-is, wi-thorit departiii,,a froir, @he spirit of my illvenu-ion. 3,5 Wlltt I