US907162A - Balanced slide-valve. - Google Patents

Description

APPLICATION FILED JUNE 17, 1907.

' Patented Dec. 22, 1908.

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G. W. MORRIS.

BALANCED SLIDE VALVE.

APILIOATIOI rum) JUN; 11, 1901.

907,162. Patented De0.22,1908.

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HHHHII GEORGE W. MORRIS, OF RAOINE, WISCONSIN.

BALANCED SLIDE-VALVE.

Specification of Letters Patent.

Patented Dec. 22, 1908.

Application filed June 17, 1907. Serial No. 379,436.

tion, reference being had to the accompanying drawings.

This invention relates to slide-valves for steam-engines, and has for its object to provide a cheap, simple and effective mechanism in connection with an ordinary slidevalve which will relieve the valve from steam pressure on its upper face so as to render reciprocation of the valve more easy.

I accomplish the object stated by the mechanism shown in the drawings and hereinafter described.

That which I believe to be new is set forth in the claims.

In the drawings,Figure 1 is a vertical central section through an ordinary engine cylinder, steam-chest and slide-valve with my improved mechanism applied to the valve; F ig. 2 is a view, partly in plan and partly in section, with the dome-shaped casing that is mounted on the steam-chest, as shown in Fig. 1, removed; and Fig. 3 is a detail, being an enlarged vertical section through the upper end of the dome-shaped casing to illustrate the manner of connecting the upper end of the pivoted rod that swings in said casing.

In the several figures of the drawings, in which corresponding parts are indicated by like reference letters :A indicates an ordinary cylinder, in which fits and reciprocates a piston B, the rod therefor bein indicated by C. In the upper part of the wa l of the casing A are formed ports ab, as usual, which communicate with the interior of the steam-chest and convey steam to and from opposite ends of the cylinder A.

c is the usual exhaust port formed in the wall of the cylinder A and located between the steam-ports a-b.

D indicates a slide-valve seated on the top of the cylinder A and adapted, of course, to alternately open and close the ports a-b, and being provided with the usual central space through which at the proper time steam is exhausted from one of the ports a-b into the opening 0.

So far the parts described may be of any ordinary construction.

On the upper face of the slide-valve D I provide a vertical projecting part, which, in the form of construction shown, is made as a short cylinder E integral with the slide-valve.

F indicates a covering member placed over the slide-valve D and independently supported from above. This covering member must have a close-fitting engagement with the projecting member E carried by the valve in order to prevent steam from bearing on the valve, and in the construction shown such covering member is made in the form of a piston fitting snugly within the cylinder E. It has a raised central hub d which is exteriorly screw-threaded, upon which is screwthreaded a wide ring f, the outer face of which fits snugly against the inner face of'the cylinder E,-suitable packing rings 6 being interposed between the parts to prevent the admission of steam between them. It is evident, that if desired the parts F and f, which in effect really constitute a single device, could be formed integrally.

9 indicates a small opening through the slide-valve D that will permit the escape of any water that might accumulate in the space between the valve and the piston from t e condensation of steam that might possibly leak past the piston.

G indicates a dome-like casing rising from and covering the steam-chest,the steamchest itself being indicated by H. This dome-like casing is secured in any suitable manner to the steam-chest,bolts h being employed for this purpose in the construction shown.

I indicates a rod pivotally secured at its lower end by a pivot 'i suitably affixed to the hub portion of the piston F and at its upper end journaled on a pin suitably secured in the upper end of the dome-like casing G. The upper end of this dome-like casing G is provided with a removable closure J secured 1n any manner so that the joint between it and the dome will be steam tight.

K indicates a ring, which may be formed of any suitable material, but preferably of hard brass, and which surrounds this cylindrical member E, to which ring are attached at opposite sides rods 7c adapted to be reciprocated by any suitable means to properly reciprocate the valve and the parts carried thereby. The ring, as shown, (see Fig. 2) is preferably made in halves bolted together. The rods 76 work, as usual, through ordinary stuffing-boxes Z that are suitably supported.

WVhile the greater portion of the upper surface of the slide-valve is covered by the piston that is independently supported from above, yet a sufficient portion of the surface of the valve is to be left uncovered, as indicated in Fig. 2, so that a sufficient amount of steam will press upon the valve to hold it at all times firmly against its seat, and it is to be understood that the piston and its cooperating member E can be made of any size desired so as to leave more or less of the upper face of the valve exposed to the steam pressure.

In operation, the slidevalve will be recip rocated in the usual manner to cover and uncover the ports a and b, and as the valve is moved towards one end or the other of the steam-chest the piston located in the covering device described will necessarily be moved with it and also owing to its connection to an overhead support through the rod I will be moved vertically, but such vertical vmovement will be a very slight one owing to the length of the suspending rod I and the short reciprocatory movement of the valve. The position assumed by the parts when the valve is drawn toward one side of the steamchest is indicated in Fig. 1 by broken lines. No matter in what position the valve may be moved on the seat it will be covered to the extent of the area of the member F, and inasmuch as such member F is supported from above such valve a large amount of steam pressure that otherwise would bear upon the upper face of the valve will be kept from the valve.

That which I claim as my invention, and desire to secure by Letters Patent, is,

1. The combination with a steam-chest having a vertically extending casing closed at the uppermost end thereof and open at the base mto the interior of said steam-chest, and a slide valve seated in said steam-chest, of a vertical cylinder on the upper face of said valve, a piston movable therein, said piston being provided with an upwardly-extending hub, a ring connected to said hub and fitting against the wall of the cylinder, and a rod pivotally connected at its lower end with said hub and at its upper end pivoted to a fixed support.

2. The combination with a steam-chest having an upwardly-extending casing closed at its uppermost end to prevent the admittance of the atmosphere and opening at the bottom into the interior of said steam-chest, of a slide valve seated in said steam-chest, a vertical cylinder formed integral with the upper face of said slide valve and having a j ecting cylinder formed integral therewit piston therein, a ring connected to said piston and movable therewith and fitting against the inner face of said cylinder, said ring formed with a vertically projecting flange fitting steam tight with the inner face of said cylinder, and a rod connected to said piston and to a pivotally fixed support, all substantially as described.

3. The combination with a steam chest having a dome-like casing projecting vertically therefrom, of a slide valve in said steam chest, a cylinder upon the upper face of said valve and formed integral therewith, a piston movable in said cylinder provided with an upwardly extending hub, and a ring removably secured to said hub having a vertically projecting flange in operative relation with the inner face of said cylinder, and a rod pivotally secured to a fixed point at the uppermost point of said dome casing and terminating in a pivoted connection with said hub formed with said piston, all substantially as described.

4. The combination with a steam-chest and a slide-valve seated therein, of a vertical cylinder on the upper face of-said valve, a piston movable therein, a ring connected with said piston so as to move therewith and fitting against the wall of the cylinder, and a rod pivotally connected at its lower end with said piston and at its upper end pivoted to a fixed support.

5. The combination with an engine cylinder having a steam-chest thereon, said engine cylinder having a piston therein, the working of which is controlled by steamports, of a slide valve seated in said steamchest controlling said steam ports, on the upper face of said slide valve a vertically 1pro- 1, in said cylinder a movable piston fitting steam tight therein, formed integral with said piston a vertically projecting hub, removably secured to said hub a ring, said ring provided with an upwardly projecting flange, the outer surface of which is formed steamtight with said cylinder, secured to said steam-chest a dome-like casing closed at its uppermost end, in said casing below said closed end a pin secured therein, a rod pivotally secured at its iipper end to said pin and pivotally secured at its lower end to said hub formed integral with said piston in said cylinder, all substantially as described.

GEORGE W. MORRIS.

Witnesses:

C. R. CARPENTER, HARVEY FORD.

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