US1636661A - Double-plunger valve - Google Patents

Description

. `w. LARNl-:R

DOUBLE PLUNGER VALVE July 19, 1927. 1,636,661

Filed May 6. 1921 fr i 'Patented July i9, 1927.

lururan sTa'rEs A PAiiN-:NT'I'olii-liza CHESTER W. LARNEB, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR., BY MESNE AS- SIGNMENTS, T0 I. IP.l MOBRISVCOBPOBATION, A CORPORATION OF DELAWARE.

DoUBLn-PLUNGER vALvn Application nled v:Inlay 8,

The nature' and 'objects'of thev present invention'will appeal` from the following description which will be made with reference to the accompanying drawings forming part hereof and in which t Figure 1 is a view principally 1n section.

yFig. 2 is a view principally in section showing a modification, and

Fi 3 is ai detached sectional View of a This invention consists of a double plunger valve adapted to operate under conditions l'of fiow in either direction. Fig. 1 shows one embodimenthaving a body or casing 1 contracted at both ends with radial ribs 2 integralwith the casingl and bored out to support in proper postlonan internal cylinv der 3 having apartition -or bulkhead 4 separating the space within the cylinder 3 into two( chambers 5 and 6.

The internal cylinder 3 contains plungers `7 and 8 sliding within it and closing against seats 9 and 10 at each' end of the body 1 to stop the How through the body. Plunger 7 closes against seat 9 to stop flow from right to left in the" ligure and plunger 8 closes against seat 10 to stop theow in the opposite direction. Plungers 7 and 8 are rigidly connected' together by a hollow strut 11 ao attached to each plunger by nose pieces 12.

Strut 11 has a centra bore which contains rod 13 and has a recess at the center in which a rack 14 slides longitudinally.

, The nose pieces :12 `1ere provided with a5 lapertures 15 for the urpose of discharging pressure from cham ers 5 and `6 into the conduit and the discharge of pressure through these apertures is controlled by the motion ot rod 13 which may lbe utilized vto ce open or close Jeither of these apertures" ac- 1 cording to` the direction in which it is moved.

Rack 14 isfrigidly connected to*l rod 13 b pins 16 or by other` suitable means. ,pinion 17 engages rack 14 and moves it in as either direction according to Whether it, is

desired to close plunger 7 or plunger 8. Pinion 17 is mounted on a shaft 18 which passes through cylinder 3 and bodyv 1 and is 'operated by suitable mechanism from the 5@ outside of the valve. I

When there is flow or tendency to iow in.

the conduit plungers 7 and 8 are opened and closed in the manner described in my retained. Pinion 1.7 engages two racks 14.a connected to rods 13a which operate plun ers 1921.. Serial No. 467,417.

^ jacent end of the rod 13 by differentiating the pressure in the chamber 5, provided past the plunger 8 a'nd through the Huid way between the body and cylinder and thence by the clearance between the plunger 7 and cylinder, with thepressure on the outside of the nose of the plunger 7, the operation-of the plunger 8 being the same.I When the con- 05 duit is empty or there is no tendency to flow, however, the operation is slightly different. Plunger 7 is then closed by moving rod 13 to the'left, the end of rod 13 abutting against its seat at aperture 15, and is opened by reversing the movement of rod 13 unt-il the other end of. the rod abuts against the seat at aperture 15 in plunger 8. The operation of plunger 8 is the reverse of the operation of plunger 7.

When flow or tendency to flow is from right to left in. the drawin it is controlled by the operation of plunger pressure being exhausted from or retained in chamber 5 which is separated from chamber 6 by partition 4 which fits closely around strut 11 1n order to prevent excessive leakage between chambers 5 and 6. When plunger 7 is being operated plunger 8 is inert and vice versa.

Figure 2 shows another embodiment of this invention in which plungers 7 and 8 are not rigidly connected together as in Fig. 1. In this case when one plunger is closed the other is'a'lso closed and when one is open the other is also open. VThe principle of using the lefthand plunger to control flow Vfrom right yto left and the rightha'nd plunger to control flow from left to right, however, is

7 and 8 in the manner described in copen ing application, Serial N o. 294,155. In this case the rods 13a have enlarged ends 19 which are utilized to pull plungers 7 and 8 open by abutting against bearings 20 connected to the .plungers, whenever-there isv no flow or tendency to flow in the conduit.

It is clear that if, for example, iiow is occurring from rightto left in the'fi re and plunger 7 is closed under these con itions it .cases be omitted. Assuming then,

'flow from right vto left and it is will be held tightly to its seat by pressure in chamber 5 admitted through .they clearance between plunger 7 and cylinder 3. At the same time, although plunger 8 is closed it is not held against its seat by difference of pressure but merely by the pressure of 19 against the seat'of aperture 15. This pressure, particularly in view of the unavoidable lost motion in the gearing, is not suficient u to prevent leakage past the seat of plunger 8 and this leakage maintains pressure linside of body 1 and in chamber 5 to hold lunger 7 tightly closed.;-

e same is true when plunger 8 closedA if the source of pressure is in the conduit to a preponderance of pressure on the outside of the plunger. Plunger 8 is also unseated and opens as rfast as its rod 13a is withdrawn, but in this case the entire outside surface o the plunger nose is subjected to full pressur and owing to the reduction of pressure inside the plunger, the plunger is pressed against the end 19 of rod 13a which'alone restrains the movement of the plunger. This throws a heavy strain upon the racks 14 and the pinion 17 and its operating mechanism. For this reason it is advisable to use thepartition 4 excepting possibly in the case of small valves.

Fig. 3 shows a modification in that por# v tion of bodyvl and plungers 7 and 8 adjacent to the plunger seat which is under certain circumstances advantageous.

Under some conditions and particularly when these valves are used with gases instead of liquidstliere may be some tendenc toward uneven or erratic movement o the plunger as it approaches the closed position and is subjected to sudden changes of pressure on the exposed area of the plunger which lies within the seat. This in the case of gas valves is dueto the elasticity of the gas and the fact that the plunger will move as a result of the expansion or contraction of^ i the gas before .suiicient time has elapsed'to permit sufficient flow to take place through aperture 15 toequalize the pressures inside and outside of the plunger.

In Fig. 3 a shoulder 21 is provided uinside `body 1 adjacent to theseat and a corresponding recess22gis provided in the plunger. The cylindrical surface of recess 22 fitsiinto 'the cylindrical surface of\shoulder 21 with a small clearance and thus practically ystops with the 1,sse,ee1

those matters or otherwisethan as the prior art and the appended claims may require.

I claim: v 1.'A doubleplunger valve operative with flow in either direction and comprising in combination a body contracted at each end and having plunger seats and provided with an internal cylinder spaced from it to provide a fluid Way, two plunger chambers sepa-I rated by a bulkhead or partition provided in the cylinder, two plungers co-operating .with

the chambers and seats and past one of which pressure is available in the fluid way and in` the chamber of the other, and valved aper-y tures through the lungers for differentiating said pressure in the chamber from the pressure on the outside of the corresponding plunger to operate the latter. i 2. A double plunger'valve operative with .flow in either direction and comprising in combination a body contracted at each end and having plunger seats and provided with an internal cylinder spaced from it to provide'a fluid way, two plunger chambers separated by a bulkhead pr partition provided in the cylinder, two plungers co-operating with the chambers-and seats and past one of which pressure isF available in the fluid way andv in the chamber of the other, valved a etating said pressure 1n the chamber from the pressure on the outside of the corresponding plunger to operatel the latter by fluid pressure, and mechanical means accessible ertures through the plungers for differfrom the outside'f the body and connected lungers and adapted to operate them in t eabsence of fluid pressure sufficient to move the plungers.

' 3. A; double plunger valve operative with flow in either direction and comprising in combination a body contracted 'at each endplunger seats and provided with and havin l cylinder spaced from it to lproan interna vide a fluid way, two plunger chambers sep;

man by a bulkhead 0r partition provid-ed, f

in the cylinder, two plungers cti-operating -with, the chambers and seats and past one of' `which pressure isy available inthe fluid Way and fn apertures through the plungers fordifferenltiating said pressure in the chamber from the pressure on spending plunger `the outside of the corre'- to' operate the latter,` a l the chamberof the other, valved strut for holding the plungersin spaced operating chamber therefor, a valve seat and a shoulder onsaid tapering portion comprising asubstantially cylindrical surface projecting from saidseat .toward the valve plunger, said hollow valve plungerbeing provided with a cylindrical surface adapted to lit in the cylindrical portion of said shoulder and also having a connection from its interior to the fluid-Way. below said seat,

l the tapering portion of said conduit is adapt- 2o whereby said plunger in cooperation with ed to gradually cut off fluid-flow through said conduit and thereafter beingr adapted t6 move .the length of said cylindrical recess before said seat is engaged, and said interior i connection, during movement or the plunger through said cylindrical recess, being adapted to permit commuicatiolibetween said chamberand the fluid-Way below said seat,

' thereby tov reduce the operating fluid pressure in said chamber and permit a gradual Aretardation of the plunger so that'said sefdt is engaged relativelyeasily.

5. Ai double plunger'valve adapted to stop and to regulate ilow in either direction having in combinationmeans comprising adjus'tahle apertures through the plungers to automatically balance the fluid pressures acting on the plungers to hold them stationary at any desired position or to unbalance Said fluid pressures. to move said plungers, and mechanical means to move said plungers when said fluid pressure means are insullicient.

6. A double plunger valve operative with flow in either direction and comprising in combination a body contracted at each end and having plunger seats and provided with an internal cylinder spaced from it to provide a fluid Way, two plunger chambers separated by a bulkhead or partition provided in the cylinder, two plungers co-operating with the chambers and seats and fpast one of stationary cylindrical housing spaced from said casing to form a fluid Way therebetween,,oppositely directed l movable valve i plungers slidably vsupprted by said housing and adapted to engage said seats, iuidy r ers may be controlled in either direction.

pressure operated means within'said housing for movin said plungers in unison with each other in t e same direction so that when one plunger closes the other opens.

8. The combination with a conduit casing having oppositely disposed valve seats, of a stationary cylindrical housing having op- `positely directed movable valve plungers adapted to engage said seats, and mechanical means having c ontrolling- -means movable relative to said plungers while dis osed within said housing for moving said p ungers in unison with each other lin the `samedi'rection so that when one plunger opens the, other plunger closes. l

9. The combination with a conduit casing having oppositely disposed valve seats, 'of a stationary cylindrical housing spaced .from said casing to form a fluid waytherebetween," oppositely directed movable valve plungers slidably supported by said houslng and adapted to 'engage said seats and combined .mechanical and fluid pressure means within said housing for moving said plungers in unison with each other, in the same direction so that when one plunger closes the other opens.

10. The combination with a conduit casi ing having oppositel directed valve seats of a stationary cylin, rical housing between said seats, movable valve plungers sliding in said. housing and seatlng against sald seats,

"ssidseats, movable valve plungers sliding in said housing and seating against said seats, andvluid' pressure operated means for moving said valve plungers comprising means for balancin the pressures on opposite sides of one of sald plungers and simultaneously unbalancingthe pressures on the other of said plungers and means connecting said valve lungers to move in unison.

12. e combination with a conduit casing having oppositely disposed valve seats, of a cylindrical houslng for containing Huid pressure, oppositely directed Llvalve plungers adaptedto engage said seats and movabiy supported by said housing, and means adaptp edto move with said plungers for controlling the discharge of lluid contained'in said housing whereby movement of said plung- 13. The combination with a conduit casing having bppositey disposed .valve seats,l of a stationary cylin rical Huid containing housing having oppositely directed valve means, movabl'y supported thereby and adapted to engage 1said seats, and means ada ted to move withv said plungersffor control ing theiuidpressure within said housing, wherebv.

the movable valve means may be controlled in either direction.4 14. The' combination with a. conduit cas- .ing having oppositely disposed valve seats,

of a stationary cylindrical lu'id containing housing having oppositely directed valve means, movably supported thereby and adaptedto engag said seats, and ,means for moving said valve meansin opposite di hollow portion of said plungers to move the meansv for controlling t lsame in oposite directions, said latter means inclu ing valve means for controlling the fluid pressure in said hollow plungers,

and mechanical actuating means en rtendlng.

from said plungers and interme'- laterally diate their ends for controlling the fluid therein.

16. The combination with a-conduit casing havingoppositely disposed valve seats, of oppositely directed ported hollow valve lplungers adapted to en age said seats, and e'ports of each of move with saidvalve means the oppositely` directed plungers wherebyA plunger movement may be controlled.

17. The combination with a conduitcasing having oppositely disposed valve seats,

of a. stationary central member,

directed ported hollow valve plungersmovoppositely y j ably'supported thereby and adapted tc'en;

gage said seats, means whereby fluid' pres- 3'y sure may be admitted to said hollow plungers, and means for controlling the ports oi trolled.

18. The combination'with a conduit casing having'oppositely disposed valve seats.

, of a stationary central' supporting member.

o positely directed hollow .ported valve p un ers movably supported by said central j mem er and adapte to engage said seats, the ports of said plungers extending in opposite directions, and movable means openin a port 1s closed plunger movement will occur in the direction which said port closing means moves.

19. The combination with a conduitl casing having oppositely disposed valve seats, of a stationary central supporting member, oppositely directed hollow movable valvep ungers adapted toengage said seats, said plungers having ports -extending' in opposite directions, and movable means for closing said ports, whereby plunger movement is effected in the direction of movement of the port closing means.- A

CHESTER W. LARNER.

1each of the op'positely `directed plungers whereby plunger movement may be Y coml for or closingaid ports whereby whew

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