US1281712A - Fluid-pressure valve. - Google Patents

Description

G; S. THOMPSON.

FLUID PRESSURE VALVE.

APPLICATION FILED OCT-1.1914.

Patented Oct. 15, 1918,

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ATTORNE V.

H ITNESSES WMM GEORGE S. THOMPSON, F HOCKESSIN, DELAWARE.

FLUID-PRESSURE VALVE.

Specification of Letters Patent.

Patented Get. 15, 19180 Application filed October 1, 1914. Serial No. 864,426.

To all whom it may. concern:

Be it known that I, GEORGE S. THOMPSON, a" citizen of the United States, and a resident of Hockessin, in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Fluid-Pressure Valves, of which the following is a specification.

My improvements relate to valves for controlling the flowof liquids and fluids under pressure, and are particularly applicable where a perfectly. tight and effective valve'seal is desirable for the prevention of leakage when the valve is closed. The ad vantages of the so called cup packing of flexible material as a means of attaining a tight joint against fluid pressure of any kind are 'well known and indisputable, but

this form of packing has not heretofore been.

adapted for use wherethe valve is of the piston type and travels in a path at right angles, or approximately s0, to one of the valve ports, as for instance in many forms of discharge or blow-off valves, &c., for the reason that when said lateral portv is reached by the cup packing the latter will be expanded beyond the area of its valve seat and its return thereto impeded if not prevented.

The main object of my present invention is to overcome this difiiculty, and to admit of the use of a cup packing under the conditions above designated while preserving the share, integrity and usefulness of the cup packing itself, so as to attain aperfect seal.

with this type of valve when closed irrespective of the pressure to which the packing is subjected internally,it being a well known axiom concerning the cup packing that the greater the internal pressure the more perfeet the seal, in contra-distinction to ordinary annular packings which are apt to leak when subjected to extraordinary fluid pressure.

' To this end my invention consists essentially in the use, in conjunction with a valve of the piston type provided with an annular cup packing, of a receiver in alinement with the piston valve into whichthe cup packing 1 recedes during the retractile movement of said piston valve and before the latter begins to open the lateral port, said receiver then yielding before the further retractile movement of thepiston and being received in turn into a compartment or extension of the valve casing provided for the purpose,the receiver automatically returning to its normal position in coincidence with said lateral port during the advance, of the piston valve to its seat and normal position beyond said lateral port, all as hereinafter more fully set forth, incidental features of the invention consisting in the specific construction and arrangement of parts.

In the accompanying drawings,

Figure 1, is a central longitudinal sectional elevation of a valve embodying the essential features of my invention, showing the relative positions of the parts when the valve is closed;

Fig. 2, is a similar view showing the relative positions of the parts when the valve is open;

Fig. 3, is a view of a split-packing ring used to protect the cup packing.

' C, represents the valve casing generally, inclosing the elongated valve chamber 0, formed with the cylindrical valve seat a, conoidal receiver seat 0 and retraction chamber 0 said casing C, being also formed with the lateral discharge port 0 opening into the valve chamber 0, at the rear of the aforesaid valve seat 0.

Resting normally in its closed position on the valve seat 0', is the cylindrical valve piston P, provided with the flexible cup packing a, the inner or transverse edge a, of which is clamped between the, piston members p, p, which screw together. The outer annular contacting flange 01?, of the cup packing a, is positioned in a space 79 between the piston member 70, p, which space is suflicient in area to admit of the partial collapse of said packing flange a when relieved of internal pressure.

The valve piston P, is advanced and re tracted by means of the screw valve stem 6, actuated by the handle 5, or any other meohanical expedient,the screw 6 in the arrangement shown in the drawings engaging with the stationary nut 0 formingpart of the casing C.

Seated normally in the casing in coincidence with the lateral port 0, and extending across the same is the protector sleeve'R, the object of which is to inclose and sustain the cup packing a, when the valve piston P, is retracted. This protector sleeve B, when the valve P, is closed and fully on its seat 0, extends to the latter, its open edge and the side walls 'I', of the receiving chamber r, then forming a continuation of into contact with the rear wall T of the sleeve R, the outer edge of the bearing fiangea ofthe cup packing a,'will be within cthe fannul ar" wall 1", of the protector" sleeve R.

The' continued ji'etractioiiof the valve p15, 7 ton P,fby'1 neans of the screw 6 to open the port cfl' will consequently also retract the protector sleeve against the resistance 7 of the spring S, which is interposed between said sleeve Rfandthelendof the casing, andwhichtends const 'antly topress the sleev e B, v; forwardintolthe position shown in tFig, 1,

' i i i and effective seal iFurthermorethe; protec-f 'tion,o;E the, cup packing isefiected- -automatiw cally byimeans ozflthe constant elastic Eesi-li v.

:ent pressure-.exe1ted against: tThQuPIOLBGtQP-m hiii f 'bqnoid l'. front f pq t qnr f nta v with the "correspondingly shaped I seat 0?, in the casing.

the iet ractive movement of the valve piston ay be e nfiil uedlm il e-r eo v the protector'sleevejcon tacts with tl e end.

e v. 5, Qf llecz s fi as ShowniI g- As the'jjvalvepiston 'P, is'returned tovits.

seat *b fmahej f the'screwbfl it is obvious that the'springjS, will hold the protector sleevefcontactswith its seat 0?, whenthecon tinned; advance of the screwwill carry 'the valv e'piston out of and beyondgthe said,

40 In tl' isiconnection it maybe stated that the c'onoidal seate c and the front edge of the receiver sleeveRQmaybe formeddn such manner that said edgei will overlap slightly as clearlyshown in Fig. 1. r The transversewall orvpartition W, of

the protector sleeve, R, as well as its rear extens on r may be formed, with holes T5,

to relieve air, compression as thesleeve is.-

retraeted into the chambe1uc e seen from ,the foregoing that-- cup, pack] ng (t is thus constantly reinforced, sustained and protected. against the efiect of lnternal pressure, no matter, how sevege,. 1ts .contact1ng flange, a?,, being) free to yield inward within v prescribed limit; but v being I: confined ;in.- expansion to, the actualcylindrical.,area of ,the, valve seat,- Henc', after; retraction and during reseata ing, the packing or' contact ing flange. af is. preseliijged in' :PQEIEGTCt alinement with, ,theseat;

c, td e ioemp resse d evenly anduniformly The depth of the latter correspondsbring the member 9, of the valve piston,

eluding by reason of peripheralcnntact". and

sleeve R, in engagement therewith until, said 7 formed, forthe purpose. inthe, frontmember 79, of the valve -.pi ,ston,,thuseifectually ex-- tension of the, ring.orv,-r1ngsiagainst the seat 1:

sleeve, theeadvance or netraction of, the valve Z y means fit ausual s rews-stem, in thew ordinary manner being all thatsis necessary in theway ofmanipulations:

What ,I elai tls my inventioneand desine Y to secure.byHLetterst Patent I 1. A,,- va1ve. of,,he character des g a-* comprising ,a-n -elongated-F;-.valv.e chamber with a cylindrical valve seat, aaconoidal seat:

adjoining said valve. seZLP'a-nd. a valveretrac I tio-n. chamber, and. a lateral-. discharge-'port sleeve E, into the position shown. in Fig. 1.

f of said valve seat and in front of the netracopening into the ivalve'chamber at the deal'i" I c 05 tion chamben, a, cylmdricalvalve (piston nor mallyresting onthe valve seatand providedn with a fiexiblecup Ipacking, and a 'PBO'BGOta-V' and lfor'm practically aport'ion or extension of th eva'l ve seat 0, so, that the rearof the valvefpiston will always be in engagement, withthe annular wall r", of the receiver R,

ing sleeve normally Jseatedin said I econoidali seatjand extending-across said lateral port-11 10 and adaptedqto. incloseand sustainsaid cup? a cylindrical valve -seat a conoidalseat-:ad-n' L15 o1n1ng-sa1d.yalve seat-:and a;valve 'retracwt-a-- 'tion ch-amber,-;;and-;arlateralqdischarge port vop ning intothe valve chamber atwthe rrearw of said-valve sea and in front of the) retrace i tion chamber, a cylindrical valve piston nor-.o V

mally, resting on; thevvalveseat and provided '1 with a; flexible-cup packing,-; and; an protect m ing sleeveqnormall-y seatedxin said: conoidali seat and extend ng acrossrsaidzlateraliport 5:

and adapted; to -inclosewand-"sustain"said l25 cup packing :whenethe piston-is:gretractedym a continuation of-the valve' seatk new irr- 3. A. valve -of: --th;echaracten cdesignated,: .1e0

comprising an elongated valve chamber with a cylindrical valve seat, a conoidal seat adjoining said valve seat and a valve retrac-' tion chamber, and a lateral discharge port opening into the valve chamber at the rear of said valve seat and in front of the retraction chamber, a cylindrical valve piston normally resting on the valve seat and provided with a flexible cup packing, a protecting sleeve having a conoidal front portion normally seated in said conoidal seat and extending across said lateral port and adapted to inclose and sustain said cup packing When the piston is retracted, said sleeve when the valve is closed and on its seat extending to the latter and forming a continuation of the valve seat, and a spring Within the chamber tending to constantly press the sleeve With its conoidal front portion in contact With the correspondingly shaped conoidal seat.

4. A valve of the character designated, comprising an elongated valve chamber With a cylindrical valve seat, a conoidal seat adjoining said valve seat and a valve retraction chamber, and a lateral discharge port opening into the valve chamber at the rear of said valve seat and in front of the retraction chamber, a cylindrical valve iston normally resting on the valve seat an provided with a flexible cup packing, a protecting sleeve having a conoidal front portion normally seated in said conoidal seat and extending across said lateral port and adapted to inclose and sustain said cup packing When the piston is retracted, said sleeve When the valve is closed and on its seat extending to the latter and forming a continuation of the valve seat, and a spring Within the chamber tending to constantly press the sleeve With its conoidal front portion in contact with the correspondingly shaped conoidal seat, said sleeve having a transverse partition with openings therethrough.

5. A valve of the character designated, comprising a valve casing having a lateral port and a cylindrical valve seat and a conoidal receiver seat adjacent thereto, a piston valve provided vvith a cup packing, a valve receiver in alinement with said piston valve into which said packing recedes during the retractile movement of the piston valve before the opening of said lateral port by said valve, said receiver having a portion fitted to said conoidal receiver seat and forming an extension of the valve seat, said receiver being adapted to yield before further retractile movement of said piston valve.

6. A valve of the character designated, comprising a valve casing having a lateral port and a cylindrical valve seat and a 00- noidal receiver seat adjacent thereto, a piston valve provided With a cup packing, a valve receiver in alinement with said piston valve into which said packing recedes during the rctractile movement of the piston valve before the opening of said lateral port by said valve, said receiver having a portion fitted to said conoidal receiver seat and forming an extension of the valve seat, said receiver being adapted to yield before further retractile movement of said piston valve, said valve casing having an extension into Which said receiver is received.

7. A valve of the character designated, comprising a valve casing having a lateral port and a cylindrical valve seat and a conoidal receiver seat adjacent thereto, a piston valve provided With a cup packing, a valve receiver in alinement with said piston valve into Which said packing recedes during the retractile movement of the piston valve before the opening of said lateral port by said valve, said receiver having a portion fitted to said conoidal receiver seat and forming an extension of the valve seat, said receiver being adapted to yield before further retractile movement of said piston valve, said valve casing having an extension into which said receiver is received, said receiver being automatically returnable to its normal position With relation to the lateral port during the advance of the piston valve to its seat and normal position beyond said port.

GEORGE S. THOMPSON.

Witnesses:

DOROTHY L. MIATT, Geo. WM. MIATT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 01 Patents,

Washington, D. 0. v

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