US434367A

US434367A - Slide-valve for engines

Info

Publication number: US434367A
Authority: US
Publication date: 1890-08-12
Anticipated expiration: 1907-08-12

Description

(No Model.)

0. L. WARD. I SLIDE VALVE FOR ENGINES. No. 434,367. Patented Aug. 12, 1890.

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E I ATTORNEYS.

4 UNITED STATES PATENT OFFICE.

OSCAR L. IVARD, OF EAGLE, NEBRASKA.

SLIDE-VALVE FOR ENGINES.

v SPECIFICATION forming part of Letters Patent No. 434,367, dated August 12, 1890. Application filed April 4, 1890- Serial No. 346,646. (No model.)

To all whom it may concern:

Be it known that I, OSCAR L. WARD, of Eagle, in the county of Cass and State of Nebraska, have invented a new and Improved Slide-Valve for Engines, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved slide-valve for steam-engines which is simple .and durable in construction and perfectly counterbalanced, so as to reduce the wear to a minim um.

The invention consists of a valve provided with intersecting slots.

The invention also consists of certain parts and details and combinations of the same, as will be hereinafter fully described, and then pointed outin the claims.

Reference is to-be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in allthe figures.

Figure 1 is a plan view of a steam-engine provided with the improvement. Fig. 2 is a transverse section of the same on the line a: 00 of Fig. 1. Fig. 3 is a sectional plan view of the same on the line y y of Fig. 2. Fig. 4 is a rear sectional elevation of the same on the line 2 z of Fig. 3, and Fig. 5 is a perspective view of the slide-Valve. v

The engine A, to which the slide-valve is applied, is provided with the cylinder B, in which operates the piston 0, connected in the usual mannerwith the main driving-shaft D. From the ends of the cylinder B lead the two inlet-ports a and 1), opening into the steamchest E, in which is fitted to slide the valve F, actuated by suitable means from the main driving-shaft D- The slide-valve F is provided with a vertically-arranged slot 0, connecting atits upper end at all times with the steam-inlet pipe G. The slide-valve Fis also provided with a transversely-arranged slot cl, intersecting the slot 0 at right angles and adapted to be connected alternately with the steam-inlet ports a and b. The steam-chest E is also provided near each end with the exhaust-ports e and f, leading to the outside, and the ends of the cylinder B are also connect-ed with the exterior of the steam-chest E by pipes H and I, respectively opening into the said steam-chest in line with the respect ive ports a. and b.

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The operation is as follows: When the piston O and the valve F are in the position shown in Fig. 3, live steam passes through the inlet-pipe G into the vertically-arranged slot 0, from which the steam can pass to the top and bottom of the slide-valve, so as to exert an equal pressure on the top and bot tom. The live steam also passes into the transversely-extending slot d, so as to exert a pressure at each side, thus completely counterbalancing the valve, so that it only rests by its own weight in the bottom of the steamchest E. The live steam passing into the e slots 0 and d can pass from the latter slot through the inlet-port a into the outer end of the cylinder B, to exert its pressure against the piston O, in order to force the same in ward in the direction of the arrow 0/. The steam in the inner end of the cylinder B can now exhaust through the port 1), leading into the steam-chest E, which is open at this end to the exhaust port f, through which the exhauststeam can escape. When the piston O nears the end of its inward stroke, the valve F changes its position-that is, it moves inwardso as to disconnect the transverse slot 61 from the inlet-port a to connect the said transverse slot d with the inlet-port b. At the same time the inlet-port a opens into the right-hand end of the steam-chest E, containing the exhaust-port e. Nowlive steam passing into the slots 0 and d passes into the port I) to the inner end of the cylinder, to exert its pressure against the piston O to force the latter outward 'in the inverse direction of the The exhaust-steam in the outer end of the cylinder B passes through the port a to the outer end of the steam-chest E and 0 through the exhaust-port e to the outer air.

It will be seen that during the time the steam cuts off either the port a or b at the ends of the valve F pressure is exerted through the respective inlet-porta orb against the cutting- 5 off end of the valve Fby the expanding steam in the cylinder; but this pressure against the valve F is counterbalanced by the steam in the cylinder passing from the respective pipe H or I against the cutting-oft end of the valve I00 F opposite the said port a or 17. Thus it will be seen that the valve F. is at all times completely counterbalanced, so that the weight. is reduced to a minimum. It will further be seen that the valve is Very simple in construction and can be readily applied to all classes of engines.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A slide-valve provided with a slotextending through it from top to bottom and with a second. slot extending through it from side to side and intersecting the first-named slot, substantially as described.

2. The combination, with a cylinder provided with inlet-ports and a steam-chest into which the said ports open, of a slide-valve in the steam-chest provided with a slot extending through it from top to bottom and registering at all times with the inlet of the steamchest, and with a second slot extending through it from side to side and intersecting the first-named slot, the said second slot a1- ternately registering with the cylinder-ports, substantially as herein shown and described.

3. The combination, with a cylinder prochest opposite the entrance of the said in1et ports to equalize the cylinder-pressure on the said slide-valve when the ports are cut off, substantially as shown and described.

4. In a slide-valve, the combination, with a cylinder provided with inlet -ports and a steam-chest into which the said ports open, of a slide-valve in the steam-chest having intersecting slots extending through it at right angles to each other, and pipes connecting the ends of the cylinder with the steam-chest opposite the inlet-ports of the said cylinder, substantially as herein shown and described.

OSCAR L. WARD.

Witnesses:

WM. M. STAUDLEY, H. H. FILSINGLER.