GB2230842A - Electrically operated valve and process for the assembly thereof - Google Patents

Abstract

An electrically operated valve comprises an electromagnet (14) with a plunger core (12), a free valve member (3) displaceable in a cavity (13) between two oppositely disposed seats (4,5), and a thrust means (33) which may or may not be fixed with respect to the plunger core (12) for actuating the valve member (3) which is also subjected to the force of a spring (15). The first seat (4) is positioned by means of a tool with respect to an abutment surface (38) for the plunger core (12) before the valve member (3) is set in position. The second seat (5) is formed in a closure portion (20) which is progressively driven into position in the assembly operation, while the variation in pressure and/or flow rate of a fluid supplying the valve is observed. The present valve makes it possible to carry out an automated and reliable adjustment process and permits production of its component parts with relatively wide dimensional tolerances. <IMAGE>

Description

ELECTFICAL1Y OPERATED, V-LVE AN:-" PROCESS 1,73F TI-IE.

The present Lnve--i-.-JCr, concerns an e-".ect=-.callv cu--raz--.4 valve at least one elect-ranagnet having a pluncer core, a free valve member which is disn,;Rceabie in a cavIty between two oppositely di=s&- seats s, =--otL-dina the cc=---es=nding orif ices of two f.' rst pneunatic conduits, said cavity also ccmmn.,ca-.-,ng with a thi-rd pneumatic c.-.nduilb", and camris:--19 means which are fixed with rest--- to the plunger core of the s-lec--mmanet to cause the valve Rerbp-- to close one or ot-her of said orifices in de----ndence on the position of said core, said cavity being provided wit-h. a closure portion which is accessible the exterior of the valve.

Electrically operated valves of that type are known and are available on the market. Thev cene---&'-'v suffer- from the disadvantage of being of a relatively high manufac-.,-=9 cost for given levels of pe=------..nance, in particular bv vi--.ue of the need for close production tolerances and delicacy of ad-justTent.

The doject of Ce inventlon is to provide an electz-ically.

opezated valve whic.l.,, per-uts in relativelv si=le and highly lendinc itself to au-.=ip-t-.;on and;R' so pe---mil---.ing a sav-;nc A -. -e-a=d to the rnar.u:!ac-t=-- o.0 the cw=nen.ts which make up t-he valve, by v-4--::ue of reduced levels of respect of di:r--ns-onal tolerances.

-c- tl:,..-- zu---cse the elect--.-a:-!v operated valve acco---"-19 to the i.-iven-,--Cn is characterised- in that each of tte t5Qc seats is so arranced Cut the ccs-,;t_cn thereof is adjustable, uccr, asserblIv of the valve, -J-, the d--ect-4on of displacc-rent cf the valve ffy-:-.ber.

in an cp-e-rated valve the ccr.-wr-ses an esser..,,.-4aL!lv coill and a voke an s=face fcr the ccre, 4whe latter be.,:.,ic cc)U--',Cd to a means arranced; in such a wav as to be caja'---e of actinc on the valve 4 =).%i. "" - - A gzw-;;mw= ' ' n-cz;z i rR Lnve.ri-b--cn is acz'4&- mre to an elec-tricall, 1 operated va-l,.re in whic.h a spring is in such a way as to tend to rreve the plunger coree away fr= the abut-,V--nt surface, and a second spring develcning a lcwe-- for-ce than that of C.e f irs t spring is dis=sed in such a wav as to tend to ffrve the valve ffenber away f= said se--cnd seat. Mbre particularly the inve-nt--cn is a=!----d to an e-lec---_.;callv one--ated valve in whir-li the valve atenbe-- is f=ed by a c,vlndr-ca.1 portion of a nuterrial which is s14chtly de-fo=nable with rescect to said f=s-t seat, and in wtich a rina or disc of a ffeterial which. is C-an tbzt of the valve niw"nw is -placed- on valve bet--n the valve mnber and the thrust mans.

The invention also concerns a process for the assertc-ly of such an el.. ect---JCal-ly cpe--a41-,--d valve, ccmrr-,s:-ng asserbling Che e-le----=,, p-gnet ---C --- lud-4-.a the tl,=..:sz mans which rrav c- mav no- be f-xe,-' with rescect to the pluncer core there-of, to the pcr-.--cn or mcr--icrs said cavity, L-it=.oducirg the pr.--,--cn the seat into its bzus-4-.C it reaches a giver, zcs4..";--.fCn with respect to said abutmnt s=rface, setting Che valve ff,&--rbe= and said seccr.d S-----;na -4-. pcs4t.:cn in the cav4-t,7, and iDrcaressive-lv in-,--cr-lucina said clcsurre portion into the cavitv until the second seat is at a aiven distance f---,:m the first seat.

is In acccr-.w.ce a wefe------=&_ jOc= =0 that crocess, sald t--,'cula= por--_Jcn is int=cduc--,' into its hcusing by mars of a toci c=r:isna a cente--.-.a s-,,jd on which. the t--,b.,lar rc-.icn 14S ulaced in such a way that it rests aga-,:.-Lst a first. and --e.-:e=,ence surface, the tool- f.,--thez a shculder de.-0z--.-,-a a seccrd refere-nce s=face is intended to and a=anced tO back C.e th=st mans, said tocl be:Ina acvar.c&the m-!ur.cer wre c--fres ccntac:: with the att,.--Tenz sur-f-ace, the diszarce bez-sle--n said reference s.,=--aces thus the final ccs-4---.:cn c: said -,--tula-- Pcz-ricn.

1, the c--rduits w----'-. fluid and measuring the flcw rate and/or t.".Ppressure of tte fluid in at least anoth= of said conduits, and the advance mcverrP-Ylt of C.e closure portion is stopped when, the measured value or values react a predletwnined threslmld or fall within a range defined by 12nit values. F----ferably the e-lec---=egnet is excited during the operation of setting Che tulbullar portion in position ard/or during the operation of setting the closure portion in position.

In accordance with an alternative form of that process, the closure portion is intzoduced into the cavity after having allowed the 4.

plunger core -W assi=e -i,.S pcs--"-4cn in which 1.1C is most remote f--= the abut.,it surface, under the effect of the f,=t string, and, after hav.-;-a- then C.,e ele---_-cmcr.et with exc--taticn energy c--=es=nding to a mL-i?, value for ac.t-,iat--cn of the ele------.-4Cally cze--at&valve and havina su=!.,e,-' one of the pne,=at-4c conduits with fluid, --'..,e advance =vemnt of the closure pc=_-cn is st=ed at the mm- ent at which attracticn c:E tlie core occ=s.

Cther feat=es and advantages of the present invent-im w= be mcre ap7.a=ant io=cn, an which is described 17=eina-.'.'..er and J'llus---ateA-:Li the ac--cnmanying d-.av-4igs in Fic=re 1 iq a partly sectional view of an embod:LTent of the e.le--t---.;cany c=ated valve to the invent-icn, z-gure 2 is a v-4e,,w in sect-4cn taken along line I:---Z in 'Figure 1, and Fia=e 3 is a view in secticn similar to that st,=.vn in Ficure 1, illustra-tina a s tem Ln the assembiv process whi. ch is pez--o=ned by mans of a suitable tool.

--.c:=es 1 ard 2 si-cw ar. e-l---tr--cal-lv c=a-.ed valve which is ty refe-rence 1 ard is Loc=rw--: by the c=-b-4-aticn c O ar. ccn=c-' b_lcc;,z --c--tien 21. and a tr.e,-7-,at-4c --crT,-4cn 2 the ac-,-,a-' valve asserbly. The ',^c block pc_-_cr.s 23 and 1. are t--cetlier by mans of m-J-s 24 and 25, the teirg by electricall 26 and 28 to a con=i'.

- (not sIncwn) and fixed by rreans of sc-cvs 27 and 37 along cne of its faces 9 to an itan of ec-ui=.p-n- indicated dia=anrat_-;cally in broken line at 30 in. Figure 2.

The electrical block portion 23 contains an eject--cmcret 14 whic.n. is disposed tl:e--ein by being ffculded in position therein and which c==ises a macnet-4sable yoke 17 prwvided with a clrlindz:4-cal e-xtens-4cn portion 17a, and a coill 16 whIch, is wctmd arcund a coil carriex- 16a a cen.t--a-l passage which ac--cmredates a rcn rreanetisable Imicular line-r portion 22 for guiding a magnet-4sable 10mvable core 12. A first s=ing 18 is disposed within the core 12 in suc.i a w-av as to tend to ar-ve the core 12 away fr--m a s=face 38 of the e-x--e.ns,;.n por-Itim 177a of the yoke 177, and to rrcve it into a rest r,cs't.; cn wren no c=rrent is 11-"CW-4ng thr-cuch the coil-. An end mortion 22a cf the liner mert_.;cn 22 projects beycnd a fixing s-L,--face 31 of the block po-.-'Cn 23, which is applied acainst. a s=face 32 of the pne,a-,at-'c bicek pc--,--cn 2. The e-nd portion 12a of the core 1.2., wtic!. is -e -elat:lcns,',-j W. lc L.

crccs-4 - m. - to the e-xtens.; n nortim 17a of the yoke 17, accnTricr-lates a avamer 33 of plastic rreterial, c=. rising a fork as indicated at 10 and 1-1. Tie 33 irwr or wav not be L-itec--a:. with the core 12.

The pr.eumt-4c block portid' 2 has a cavitl 13 which is closed t.=n assembiv of the valve by a closl-,--e portion 20, afte-r having received' a -f=e_ valve Terbe= 3 wtic.l-. is fon-md bv a pcrticn of e-'.astca)ezic rratez:.-:a-l. The valve 3 is dismiaceable cver a shcr: distance in t_he direction, of its axis between twc o=sitelly d---csed seats 4 and 5 within the cavity 13. T.-e seats 4 and 5 cc=ise C-e or-ifices respective c--rduij,-s of which cne camtnicates wit-h an exhaust duct 6, as indicated by E, w-h-,!e the other ccrd,.i-4t cnn-.Lr.- fca-.es wth a -_ress=e feed duct 8, as -4-dicated '_-v P. The tAc ducts 6 and 8 c_lcses the cr-.4.0-4C-- c=0 the seat 4. Cn the side c=site to Cat against wr-,ch the spr=g 15 bea--s, the valve mmer 3 ca=ies a thin disc or ring 1-9 of a non-macnetic rhe seat 4 is fo=red by a separately added, end portl; on of a tube 4a which is fitted into a c-.rlirid=,Ical hcusinc 39 in the block portion 2. The seat 5 is fo=red bv a cen=al part. of the closure portion 20 and is disposed substantially coax-4al-ly with respect to the seat 4.

When, the t-^n block portions 2 and 23 are fitted together, the lixts 10 and Ill of the fork, fc.-.rL4ng!:he means 33 mass into t-AC passages 34 and 35 in order then to extend into the cavity 13 by passing cn r---z>---t-,ve sides of the duct 6 and to reach the ring 19 acainst wi.,--c.l.,. the force develored bv the scr4nc 18 is then That tl.^=..ist force 14s of a value such that it causes the valve we-rL,er 3 to be arz!-4&d acainst the seat 5, cwmress.-ic the 159 spring 15 when the e-',--ct--,omgr.ez is not excited. Wten the ele--t- -=ecr.et i4 is e-xc--.ed by passing a the c-re 12 is attracted tc%,,=,d's Ce e-xten.s--cn port_,cn 17a against which it cwP-s to bear, thereby ccm--ess.,ng Ce smring 18. That mveneent. the=e..Por- pe---n,,ts C.e sur?-ng 15, J= the force of which is added:Ln the ccur-se of crerat-4cn Che presw=re dotaining in the duct 8, to urce the valIve avaTbp-- 3 t--wa--ds C.e o=fice Ln the seat 4 it closes off.

Ccnse--ue-nt.lv a distinction is made betjw%----i a rest ccnd-4t4cn in wt. ilch the ducts 6 and 7 c=rra-,r.-4cate with each other and an cuerative c--r.d-4'---4Cn in whic.h it is the ducts 7 and 8 are --;-, cccrr.l.ulrllc-n-.--cn w n eaw. other.

II.e pre-sent. crerated valve Is assembled in the -OOLI-cw-4nc rrarre=:

s 0Lx-, the bcd,.r of the el--ctric-." 1,1^c.k e --r.e,=az-= 2, the b 1 ock --c--ticr 22 entixely asserbled and nc a,', us tn--n:: hav4--c been made as recar--s the re-'az- .ve 1 - - r---!at_,cn to the atut.,nt -,=---ace the core 12, is at a given rcn ad-Justable distance wt:ich involves the usuall product--cn tolerances.

The -.r.e,.za=_4c block pc--.,,icn 2 on the other bznd bzs not yet been the c==nents 4a, 3, 19 and 20 at the time of the present asse-,tlv p=ce&=e, and the cavity 13 is consequently open at that s,"-,ace.

W1-,e_n Ce twic block portions are brought tccel--',.1=, al.!,,rit bet-sy----n the axis X-X' of the core 12 and the axis Y-Y' along whic,"i the valve n-L-.rbw 3 w-42.11 be dzszlaced is achieved on the one hand by virtue 10 of the cc-omerat_-cn of laterrall projections (not s11-xm in &, e drawings) on one of the block portions, whic.b. engage into recesses or ope--L,.ngs (a2-sc nct s,;-jcw.) Ln &.e ot-I.P-- block pc--.-cn, the f:ixLng pins 24 and 25 pass-.;-,a &=--uc:17. the assembled ccn=nents, and on the other hard, by v4=.ie of the end tortion 22a cl' the tub-Llar por--icn 22 penet-rating into a bore 36 in &-e block portion 2. M respective dirmnsicns of the la-c-e-- are sT-,c.;-. that a seal. 21. is to cm=ressicn at that location in a rad4A! di--ec-,.,on, in such a way as to e.-,.sure that the a=--ar.can--nt is sealled, mre in rel.at--cn to the inte=,1c-- of t-he pr.e,-7et-4c block pcrt--cn 2.

Cr.ce the Cwm block portions 23 and 2 hzve been fix&- tocetl,,.P--, the tube 4a is set in position in its Imusing 39 by means of a tool by a ---d c-r bar 40 %ticIi is shcw-n in Ficure 3. The rod or bar 40 has a ci,-lind----cal centeL-4-.C lua or s-,.id 41 on which tie tube 4a is disccse,-!, a su--zcrt s=--ace 41a suzoortina the end of &.e tube 4a Zccr.-,LL.-,a &.p- seat 4. vcz--ecvez the rod or = 40 1,2s an ar-nular s!7=ulder 42, -C-_e --lane cf 4-5 to &.e axis of the luc or 5-tud 31 and cn the disc or 1.9 is dis=s&-.

Before;".-',.e cce=a-"-4cn c= ir.se-"z-4-.a &.e t.:be 4a =to the 1-cus-4-a 39, the ccre 12 and ccnse--ue--it_'v &.e f=k 10and 1 1 bv the szulder 42 mushes rac'.-.. t_he fork c--n-.0-4gu-"--t--cn 10 and 1. 1 and the-ref-cre the core 12 against. the force of the spr g 18 untill the core 12 ccrr-es to be= acainst the surface 38.

The rod or bar 40 is t:he-,i withdrawn and the valve mnt- 3 prcvided with the ring 19, t-geC.P-r with the cicsu=e mr:-cn 20 with the swina IS, are then set in pes-,t-,cn, the closu,--e portion 20 being engaced- into a bore 13a of the cam-ity 13, and cro=ess:iveiv advanced.

The advance mverent of the closure portion 20 is to be continued until the time at whIch Che distance bet--n the seats 4 and 5 provides the leng-ch of t=avel mcveTe-nt of the valve mr wh-,r-i is recu---ed for emning of C.e valve, having regard to the effective Chickness of the valve memt\--- 3.

in accortlance with a f=st enfoc.d&e-nt of the process for ad-jus-.--ig the pcs_.;-__4cn of the seat 5, the coil 16 is exr--4t.&- before the ad-jusz.-er.-. cpe=.a-,-4cn, such a way thaz the core 12 is in its raised pcs-4-$--4cn, that is to say it is c--nzac.: wizin the surface 38. The necessa=; of the t=avel. movement of the valve ffeTt>--- 3 can then be detecz&_ bv mea.-j=--7p-,r, in reszec-, of tl:..e mressurre cr flow rate of a fluid flowing either bet--n the ducts 6 and 7 or betoe-en the ducts 8 ard 7. TIne advance =veme-n,"- of C.e closure portion 20 is stor-Ped at the M=Ts--n-L at which the values of the pressure or flow rate of the fluid re-Ach a given or are in a selected rance defined by lintit An a!-.e--.nat-4,;.e fc=n, cú thaz m=cess involves also ccse=.r:lr.g creratim of the e-'.-----nmacr.et at a aiven value in restect of thd act.,a-1-4-.a voltage. For tt purpose, afte-- havin.a Allcwe,-' the scr.- ia 13 t-t2-:.ke effec.: tz meve the fork ccn-,:-.;cwaz-4cn 10 &nd -" into the WS cr. -IIi %r_1c--- is as f-W aw-av the s=face 38 as wn the atsence of t.he valve n-iE--be= 3, the voltace rectified the =sz un:Eavcurab-'.e wave w4 11 be selected. In ctj:,= %ocrds, C.e el. --ct--awgr.e4-- is put under the miniumn conditions of e-xc-4taticn under which it is to be capaInle of actuating che valve in the course of crx---a-,_4cn With the fork c-n:E-iC=at..Icn 10 and 11 in tbe lcwes t, position, that is to say the mcsition of tbe core 12 in which it is mst remote f= the surface 38, that mLni= excitatim is not suffic-Lent to t=_4Cger off the mvement of core 12.

TI7.e. fact of setting in pos.;.icn t_he closure poj--.-,cn 20 which firstiv causes the seat 5 to come to bear against the valve menber 3 and thern the valve m-Tfce= 3 with its ring 19 agaJ_nst the fork. configuration and 112 preve-nts the passage of a fluid at calbrate,-' or starAardised pressure, wti-,lr.1 is s-u-mlied by way of the duct 8. When the closure portim 20 is mr--c--essiveiv driven into ms-J161-icn, the rina 19 pushes the fork ccr.--0--a=aticn 10 and 11 back in the d-4-ect--cn indicated by Ce ar----w F ur.t.1 the at whic.11. the air gap bet-,X---'1 the c=wnents 17a and 11-1 _-eac.tes a value at whi, ch revement of &,.e core 12 is off and the valve ni--rter 3 be.-%--nc the rna 19 car. be under the for--e of the spring 155, to close of.-"' the seat 4.

T1he mcsitim of the cm=ne-nts in which &.p-t attraction effect occurs c--=eswr.ds to the rer-mized pcs-,t--cn of the seat 5 with respect to the seat 4, tak-na ac----=t of the effective thickaness of the valve mL-ber 3 ard t_he 19. That pcs---.:lcn is detected by cbse--.r4-9 the variat-4cn j.-i pressure at a dcwr.s-,.--e-.xn pcs-4,--_4cn or Ce var--at- 4cn in &.e flcw rate thr-ouch Che orifice of the seat 5. A sTeL.'- amunt c-' add--ticnal dismiac-nt mway also be kmar-ted to the clost,--e portion -40 rti value a situatim in which to adust the flcw rate to a pa &.e fIcw =ate %1r-u-lddeni--atLe &.eref---crn, &-at to sav in a situatim in .e --cw rate measured at &.e at YNt-ich ItIne core 12 was attracted was areater &.ar. &.e aocve-,-,enticneA- value.

ec ns 04: 4 1, z ad-;us--Tent Cf t_he respective rcs-,-.-"c - ---e seats 4 and 3, acc:c----,ance t_he -resent i.-i.,,;en::_-:cn involves --.e effective c ' &.e A,-.ct--;cra:. czr.ce=&-, -4- the o': te valve r,4--te= 3 and the r-;-c 19. vúrecver -;-.e th--c.k-.ess n 1 is positioning the tube 4a, whicn was described hereinbefore with resoect.

to Figure 3. lt is to be noted in that c-rnec-1..-cn that the final pcs4L."-,cn of the valve menbw 3, in which the valve 3 prov-4des for can-lete and sealng closure of the of the tube 4a, is defined by the shoulders 42 and 41a of the tool 40. The respective heichts of the skl=ulders 42 and 41a are so selected that a certain residuall clearance st411 cc-curs bet-we--n the ring 19 and the lints 10 and 1.1 of the fork. c,-.n.0-49=at-4cn of the th=ust means 33, when the valve nk--rber 3, urcn displacement thereof in C.e d-4--.-ect.,lcn indicated by the ar---w FE, comes into c--ntac,,,. by wav of its cen-.-al po:rtion the seat 4. That clear-ance pe---.n-4ts the valve m= 3 to be a=lied against the seat 4 in 'whe c-_u_yse or orle-l-ation of the valve in suc-t a way that slicht --esil..enr- de-.4:o-.-rar--,cn of its cen=al ppc=-4Cn takes place in C-P,;er to close cf-f tIne or-.;.0-4ce of the t--,ce 4a, e.-sur-- a good 19 effect uccn cIcsure of the valve.

It will! be seen f=in the foreacina tir.a-, the of the & e 1; c a 1. acerated- valve ac---r,-'.ina to the invention makes it pcss::c".Le to c--z-:::1.r cut an adus=ent pr-wess which. lends itself perfectly to au-l.=.et-,cn. The p---cess is relatIVely sir-,mle and the adjusting cpera-Licr-s are effected sole!,,, at the level of the pneumatic bloc.k ocr--_Jcn, once th.e latter h-as been to an ele--t---4Cal block por-ticn. The resul-.--nc ele----::,c:4"v operated valIve is distinguished by J_ -a a ich le,-el of rell- in by v,-,--tue of th.e fact- that the ad..us--Tent -_r-_cedu=e,:-nvc-',;.es al c=nents, and its ccsz rre- nu=ac- - -c of Its c= =nents to _!-_-ar.ces.

the dir%.s_cns of the price is Also reduced in ter-rs of do not re--ji=e cicse d-,.-,ens..Icnal 1. An ellec-trically operated- valve cc=r-4sing at least one e-lec.,--cr. et (14) with a plunger core (12), a free valve meTb--- (3) which is displaceable in a cavity (13) bet--n t-.m cr.=si'.',--ly disposed seats (4, 5) surrounding the corresponding orifices of t-.m first pneumatic conduits (6, 8), said cavity (13) also ca-,n=ca-k.:ng With a third mneuratic c.-rdu:L.". (7), and cw=r-4s:lna means (33) whicth are fixed respect to the plunger core of the e-le--t=cmanet (14) for causina the valve ffenber (3).11M close one or other of said or-4.i-ices in accordance with the position of said core (12), said cavity (13) being provided w-4-ji a closure portion (20) which is accessEble f= Ce e-xt----.Cr cf tte va.!:.-e, c!7=acte--is&- in that each c=0 the -,Ac seats (4, 5) is so az--anc&- that its pcs_--;_--cn is adi us table, uccn assembly of the valve, in the direction. of dis-o-llac--.T.&---.t of the valve marber (3).

2. An elect----cally valve as set forth in cia:n. 1 wt"e--ein the ele--t==ecnel.- (14) cmmr:ses an essentially cylindrical coill (16) ard a yoke (17) an abui=mr.."k- surface (38) for the pluncer c-.r-- (12), t_he latter being ccumled to a mars (33, 10, a----ar.a&- to be cazab-1ie CA. actng on the valve.be= (3), cb,:--ac--e--- 4sed in that the first (4) of said seats is formed by a t-,tula=. rcrtion (4a) which is a force fit in a -hcusing (39) provided in a wall of said cavity (13) c--ntainLna the valve nenber.

3. An ele--t---4Cal-l-v czerated valve as set forth in claim 2 in.1that C. e seccr.d (5) of sald seats -4s for-ned CV or is with -zes--ecz 14-0 the cicsi.-,-e (201, of the cavity c=taining C.e valme Tr--.te= (3).

: -: -v '. =hrz gr-- _; - i 1 - 12 sucl- a wav as tz -end a sz:r-.-a mve th.e -",urcer =re (12) wwav f--=n, t_he acuz-,Y-,n:: (38) ard a Im- - s---zr.d szr-.:-.a which de,;.e.:-czs a lcw-e= fcr=e t.= ttat of the first- t spring J s disposed in such a way- as to tend to ncve the valve meTd,-- (3) away f--.cn said second seat (5).

5. An elec-4-Can,., operated valve as set in claim 4 whe.rein the vallw-e werbe= (3) is fo,- by a --.,!.rd--:lca-l portion of a rrateriall wh-ich is slightly defo=rable wilth respect. to said fIrst seat (4) and wi.e--eLi a rina or disc (19) of a m-ce----4al which is harder Chan that of the valve manber (3) is d.,s=sed on the valve merrber bet--n sam and the thrist, neans (33).

6. A m=--cess for the asseirb-l,,r cf- --he c=ated val,4e as set in claim 4 ch=acterisedd by assembling the e-'1e--t--=-egr.et (14) including the rreans (33, 10, 111) which is fixed with resrect to the miuncer core (.12), to the rcrt-4cn or pc=ons fo=n,.ng sa'd cav.--t..r (13), the tutula= -jc=:lcn (4a) f=ing the seat (4) into its housing (39) as 0 JJ. -- j far as a given rcs4-:lcn with re--zec-, to said abutTe-nt sur-face (38), sezzing the valve aent--- (3) and said seccnd string (15) in place in the cavity (13) and -c-"--c--"ess:. veiy int=ducing said closure por--_.cn (20) into the cav-4471, (113) until the second seat (5) is at a des.,--c-4 distance f---,m the -.0i=t seat (4).

7. A crocess as set fcr--'i in claim 6 in said t=tullar rcrt_.;cn (4a) is int---oduced into its br-using (39) bv mears of a tool (40) canpr.,R-,'-a a cent-4-9 lua (41) = the por--.-cn is placed in such a wav t,.=-z it rests on a and refe-rence (41a), the (40) a shoulder (42) m a def =-,nc a see-,-T-e4 "=,9= c is -,ntend&- and =ar.geA- to --a--ence back C.e th=st rreans (33), sal:- tzol (40) ce-4-a advarced until 1 ic 4 1, 141 ==;A -=.==" =

Claims (1)

1. 8. A p=cess as set fc=--'i in claim 7 for the assernblv of an e-lect--

   ical-lv coerated valve as set forth in Claim 5 c!=acte--:lsed in that said rina or disc (19) is dis=sed on the shculdex- (42) of said tool (40).

   9. A process as set fortI'I in one of claim 7 and 8 characterised in that said closure portion (20) is int=oduc-.4 into tl-.e cavity. (13), with one of the pneuratic cc-nduits (6, 7, 8) being supplied with fluid and with maswemnt in respect of the flow rate and/or the pressure of 4-he fluid in at leas- one other of said conduits, and Cat the advance =varent of the closure pc.-b.-,cn (20) is stop -c&. when the measured value or values reach a predete=ined threshold or lie in a rance defined by limit values.

   10. A z=cess as set fo=1.i in one of claim 7, 8 and 9 in that the elf----_amcr.et ( 114) is excited during the czx---at--cn of set-ting the -,t.cular oort.,cn (4a) in position andl'or during the operation of the closure pc--1-4Cn (20) in pcs-4.b-.-.4cn.

   L21. A process as set fcrt-li in one of claims 7 and 8 ch=acterised in thaz. said cicsure por-,_4cn (20) is int--cduced into said cavity (13) after the pluncer core (12) bzs been allowed to ass,=e iths pcs-4-,--.cn of beL-ig ar- its greatest specing from the i!fcut.nt surface (1.8), under the force cf: the fir-st. s--r-4-.g (18), and, after thee hzs then.

   been with an e-xc:ita-l_:cn e-ne--gy cor--es=r.d...nc to a mini= value Icr ac---,a-k-.cn of th.e cr-e=a-L.&- valve and after one of C.e con&jits has teen with. fluid, tlhe advance cf: the closure portion (2.0) is stcFpe.--' at =he =ment. at which. attraction cf: the core (12) c-c----z.

   I 12. An electrically operated valve as set forth in claim 1 substantially as herein described with reference to, and as shown in, the accompanying drawings.

   13. A process for the assembly of the electrically operated valve as set forth in claim 6 substantially as herein described with reference to the accompanying drawings.

   Published 1990 atThe Patent Office. State House. 6671 High Holborn. LondonWC1R4TP.Further copies maybe obtained from The Patent Office.