US1004494A

US1004494A - Valve.

Info

Publication number: US1004494A
Application number: US61926111A
Authority: US
Inventors: Johann Stumpf
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-04-06
Filing date: 1911-04-06
Publication date: 1911-09-26
Anticipated expiration: 1928-09-26

Description

J. STUMPP. VALVE APPLICATION FILED APR. 6, 1911.

1,004,494. Patented Sept. 26,1911.

.r hj ntW-Q as ai ed I yalv iillf: Whichythe following a spec1fi 1 UNITED s'rArns ..-T BM I. s t. or rea i iadyjdvicern:

cation, reference-being had therein to the itimrermarl eum his H.118, t qn relates to improvements in ributiom'valves-for steam engines, compresstors {andthe like. and is a further developinentlof the valve described in my copendirig'application Serial No. 588,936, filed Qcta 2.5,, -1910.. In that application there is 5 described a form Qf double seat valve made impne piecewith one pair of closing faces co-ahting'rigidlyand pressed into engagement ,by a spring and another pair of coacting faces co-acting resiliently and pressed together by steam or fluid pressure.

, ,iA ccording' to. the present invention, the

valve has two seats and one of its seats is supportedcna reslhent ring or annulus so as to bev pressed by fluid pressure against one of "the seating faces of the valve, while the other seat; rigid.

Inf 'top v'alves it has already been proposed'to provide double seat valves with a resiliently supported seat or face; such valves being screwed down tightly. In

screwin down stop valves of this type, the resiliently co-acting faces come into engagement before the rigid pair and the resilient pair are thus held tight, wholly or partly by the tensioning of their resilient support and as the force applied to the screw down Sp1l'1-' dle may be considerable; a considerable initial tension may be applied to the resilient supporting member or spring. In distribution valves, however, the initial tensioning 'is necessarily limited as the holding down force is supplied by a spring. In engines,

especially high speed engines, this sprin cannot be made of unlimited strength 311K in fact it is desirable to reduce the strengthof this spring as much as possible in order'to reduce the energy absorbed in operating the valves. There is thus this essential difference'in the design of a stop valve and a distribution valve viz., the closing force in the caseof the'stop valve may be made ample to provide a large margin to insure absolute tightness whereas the distribution valve may only have a restricted force: In

the case of distribution valves, therefore, it

of the .utmostimportance that the closing FIECIENT OFFICE.

Grammar... -11 .1

forcepbe small and that this closing force be uniform on each unit area'ofthe valve.

1 I ttm wr L ttst fa nt;- PatentedSept.,26,,1911;1-.

Aux ar es,si deprl ie L-" r o-61 261.;

The above conditions are met in my prior case by suitably proportioning an unbalanced resilient ring on the valve. According to the present invention the requirements mentioned are metin a different Way.

Referring to the drawing which shows one convenient form, the valve a, is made in one piece of steel or other suitable metal and is operable by a reciprocating rod f, which raises the valve against its spring 9, and

when the valve is as shown, the rod also raises it against the unbalanced pressure on the overhanging annulus e. The upper seat-' ing face of the valve closes on a seat I), machined on a ledge on'the valye casing 29. The hub a,.of the valve is guided in a part cl, which is fixed in the valve casing or chest I). This removable part d, has at its" upper edge a resiliently supported seatyc, formed on a ring J.

The hollow annulus or ring cl, extends outward and upward toward the seat 6,

then is bent around to extend inward and upward. The valve seat is formed on the end of said inwardly and upwardly extending part and this seat forms the point of contact of the resilient annulus and e lower seating face of the valve. The'ringd, is bellied outwardly with respect to the- 1 pressure side and it is to be assumed that the interior of this ring is subjected to high pressure while the exterior isv subjected to atmospheric pressure or to condenser pressure. The valve is also subjected to the pressure of a spring g, .tending to hold it down. Further, in the form shown, the upper seating face overhangs the lower seating face by'an amount e. The ring d, is filled with steam which tends-to press the seat 0,- upward against the valve with a pressure (neglecting the force necessary to expand the ring) dependent upon the amount of the steam pressure and the area of the surfaces on which it acts. By prop: erly proportioning the ring d, the pressure of the seat 0, upward may be such as to give the same pressure per-unit area on both the upper and lower faces of the valve. The

moment is equal to the moment SXP and S is the downward pressure of the face at 0. The force tending to close the valve is the spring pressure F plus the pressure, say P, of the fluid on the annulus e. The-pressure on the upper pair of faces is thus P+FS so that uniform pressure per unit area over both seats will be secured if S:P+FS= length of seat a: length of seat 6, that is to say inthe same-ratio as the radii of the seats.

' In comparing the form according to this invention with that described in my prior 7 case, it will be seen that in my prior case the Whole of the spring pressure acts on the rigidly' coacting faces while the unbalanced pressure on the valveacts on the resiliently coeacting faces, that is to say P acts on the resilientpair and F acts on the rigid pair of. coacting faces. In the present case however, the determining factor forthe'uniformity of the pressure is the ring d which as described above determines the amount oft-he downward pressure S.

I claim:

1. In combination with a reciprocatory rod, a valve having two seating faces at tached to said rod, a casing for said valve, a sweat arranged rigidly with said casing for cooperating with one of said seating faces,

' a detachable part hired in said casing and a resiliently supported seat on said detachable part, said last named seat being pressed by theaction of the pressure fluid against the other of-said seating faces.

"2. In combination with a reciprocatory rod, a valve having two seating faces attached to said rod, a casing for said valve,

a seat arranged rigidly with said casing for cooperating with one of said seating faces, .a detachable part fixed in said casing, a resilient annulus on said detachable part, said annulus being pressed by the action of the pressure fluid against the other of said seating faces when-the valve is sea-ted, a spring tending to press said'valve against said seat and annulus.

I 3. In combination with a reciprocatory rod, a valve having two seating faces attached to said rod, a casing for said valve,

a seat' formed rigidly with said casing for cooperating with one of said seating faces,

a detachable part fixed tosaid casing and extending toward the seat on said casing, a

resiliehthollowed out annulus at the end of said part nearest to said seat, said hollow annulus extending outwardly and upwardly and then inwardly and upwardly, the end of I my hand in the presence of two witnesses.

JOHANN STUMPF,

Witnesses WILLY WINTER, FRANZ Mt'rnmnn.

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