US277795A - Balanced slide-valve - Google Patents

Description

(No Model.)

v G. SHONB.

BALANGED SLIDE VALVE.

No. 277,795. Patented May 15,1883.

\'Y Jf/ D UNlTED STATES` PATENT OFFICE.

. GEORGE SHONE, OF EAST ST. LOUIS, ILLINOIS.

vBALANCED SLIDE-VALVE;

SPECIFICATION forming part of Letters Patent No. 277,795, dated May 15, 1883.

,-5- Application filed Junuaryd, 1883. (No model.)

To all whom it may concern:

Be it known that I, GEORGE SHONE, of East St. Louis, St. Clair county, State of Illinois, have invented a certain new and useful Improvement in Balanced Slide Valves, ot' which the following is a full, clear, and exact description, reference being had tothe accompanying drawings, forming part of this specication.

My improvement consists of a slide-valve having duplicate members working on opposite sides ofa valve-seat boxor casting, through which the steam -passages extend upward above the usual valve-seat. These members have end extensions that bear one against the other to relieve the working-faces from pressure ofthe steam upon their outer sides. Valves in the top of the seat-box allow the escape of steam from the exhausting end of the cylinder, it' at any time the pressure therein exceeds the pressure in the steam-chest.

Figure l is a longitudinal section at l l, Fig. 5, the valves in central position. Fig. 2 is a horizontal section at 2 3, Fig. 4, the valves being in position for the cylinder to take steam at one end and exhaust at the other; and Fig. 3 is a similar view, except that the valve is in the reverse position. Fig. I is a side view. Fig. 5 is a top view. Fig. 6 is a transverse section at 6 6, Fig. 2. Fig. 7 is a transverse section at 7 7, Fig. 2.

A is part of a steam engine cylinder, having steam -ports A' and exhaustport A2, as usual. Y

Bisthesteam-chest,madehigh enough to contain the valve-seat box or cast-ing C. The part C may be made separate from the cylinder A and tted to the ordinary valve seat, A2, as

shown, and made fast thereto by screws; or`

it may be east in one piece with the cylinder.

- The steam-ports A' and exhaust-ports A2 ex- "Lis tend, as shown at A'X A' and A2", upward in the seat-box C, and each side of the box is dressed oft' into a valve-seat, O', substantially similar to that A3, the ports beingv closed at top, (and open to the sides.)

D is a slide-valve working upon the upright valve-seat G'. The valve proper is of the ordinary D form, but has extensions D' at each end.` These extensions or arms carry inwardly-extending bearing-plates D2. The valves are made in duplicate, as before stated,

| so that the steam -pressure is equal on each, and as the plates D2 at both ends bear upon or against each other the valves are perfectly balanced, and may be made to bear upon the seats C' as lightly as may be consistent with tightness of lit, (to prevent the passage of steam between the surfacesin contact.) Any wear,

-ing upward from the steam-ports A' to the steam-chest chamber, and supplied with upwardly-openin g valves E' ,formin grelief-valves for the steam in the exhausting end of the cylinder, it it at any time exceeds in pressure that of the live steam in the steam-chest.

F is a yoke surrounding the valves. Gis the valve-stem, giving means for the working' of the valves in the usualmanner.

H is a horn entering the socketbearin g I, and senving to support that end of the yoke.

The valves may be carried by the yoke, or may have bearing solely upon the flange O2ot the valve-seat box C, or upon raised hearings upon said itl-ange. Vhere the valves are supported on the yoke they are made with lips l)4 bearing thereupon.

It-will be seen that the ports A' and A2 in the valve-seatl box I) do not extend down to the lower edges ofthe valves D. Thus leakage ot' steam beneath the valves is prevented.

The operation of" my improvement is as follows: When the valves are in either ofthe positions shown in Figs. 2 or 3 the live steam scends through the port A' into the cylinder. (See Figs. 2 and 6.) The exhaust-steam escapes 'rom the other end of the cylinder through the port A', chamber D5 of the valve, and through the exhaust-passage A2.

I claim- 1. In combination with a cylinder .having steam-ports A', a central exhaust-port, A2, and a suitable steam-chest, of avalve-seat box having extensions A'X A'X and A2X to the steam and exhaust ports, open at sides, and ports E, communicating with the extensions A'x A',

In the seat-box O are valve-ports E, extend-` enters the valve-seat box horizontally and deprovided with valves E E to relieve the ex- D2, openings D`,and chambers D5, and ayoke,

haust-stealn when atgreaterpressure than that F, substantially as setforth. within the steam-chest, as set forth. 2. Thecombinationof seat-boxhaving lsteam GEO' SHONE 5 and exhaust port extensions and valve seats Witnesses: l

.at the sides, a, slide-valve having extensions D l SAML. KNIGHT, at each side,inwardly-extendingbearing-plates GEO. H. KNIGHT

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