US237994A - Steam-actuated valve - Google Patents

Description

(No moal. P. MURRAY, Jr...

Steam 'Aotua ted Val-vs.

N PETERS, FHOTD-LJILHDGRAFHER, WASHINGTON. 0.1L

. UNITED STATES PATENT OFFICE.

PETER MURRAY, JR, OF NEWARK, NEW JERsEY;

STEAM-ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 237,994, dated February 22, 1881.

Application filed May 15, 1880 (No model.) i

To all whom it may concern:

Be it known that I, PETER MURRAY, J r., of Newark, Essex county, in the State of New Jersey, have invented certain new and useful Improvements in Steam-ActuatedValves, of which thefollowing is a specification.

My invention consists, chiefly, in the arran gement or combination oftwo piston-valves, one within the other, working automatically by steam-pressure, an outside (or in connection therewith a main) steam-valve for. supplying steam to a cylinder, substantially as hereinafter specified and claimed.

In' the accompanying drawings, Figure 1 represents a vertical longitudinal section of valves and chest embodying some of my improvements, having the main cylinder-valve separate from the piston-valve, but moved by fitting in collar formed at center of outer piston-valve made for that purpose; also,' one method of connecting the ends of outer valve with the exhaust. Fig. 2 represents a vertical longitudinal section embodying other improvements, and having the main valve forming a part of the outer piston-valve with a different method of applying, the exhaust to the end of the outer piston by means of an annular space on the inner valve or rod, keeping the exhaust under the control of the inner valve, and keeping open later in the movement of the outer valve.

Similar letters of reference designate corresponding parts in both figures.

A represents the inner piston-valve or rod; B, the outer piston-valve, forming part of main valve in Fig. 2.

0 represents the main valve separate from outer piston-valve in Fig. 1.

D represents the steam-chestin Fig. 1, forming a part of cylinder. In Fig.2 D shows the steam-chest separate from the cylinder, so that the whole may be removed for repair without disturbing the cylinder.

E represents the heads for chest, forming guides for the inner valve.

F shows the steam-space; G and G, the ports to the cylinder; H, the exhaust-port; M, the piston of the main cylinder.

a a. are the small ports for the inner valve or rod; b b, small ports for the larger outer valve, connecting directly with the en gine-cylinder; c 0, ports through the outer valve, B, and connecting the annular channels c c on the outer valve and the annular channels 0 c on the inner valve.

cl d represent the clearance for the outer valve.

- 6 e representthe exhaust ports or passages for the outer valve, B, connecting direct with the main exhaust-port H.

In the operation of my invention, when the outer valve, B, (or the valve 0 in connection,) is in the position of full throw, as shown in Fig. 1, steam is admitted to port G and small port a, moving the inner valve or stem, A, to full throw, as shown in both figures, and the main piston moves along the cylinder until it passes the port I), through which steam enters to c and (Z, forcing the outer valve, B, toward cl, where there is a vacuum formed through exhaust-port c to exhaust H and to the condenser (or to the atmosphere with a high-pressure engine) until the main valve 0 admits steam to port G, and through a to end of inner valve or rod, A, while the exhaust is opened to port G and small port a, causing the inner valve or rod, A, immediately to move to a reverse position, occupying space It instead of L. This also closes the steam-port to the outer valve, 0, and onlyleaves expansionpressure and headwayand full vacuum through I) and c, to carry the valve to a full. throw, making an easy and noiseless motion. This opens the full pressure on the piston M, and it moves toward the other end of the cylinder, when, again, the valve reverses, and the piston is ready for the return movement.

In the operation of the valve, as in Fig. 2, the movements and connections remain the same, except that the exhaust-hole e 6 connects with an annular space on the inner valve or rod, A. As the expanded steam from the cylinder is admitted at etc the outer valve, B, it moves to open steam to main cylinderthrough port G, when pressure passes through hole a to inner valve or rod, A, moving it toward it. While this movement is taking place the outer valve, B, moves full over, and is cushioned against the steam left in space (1 by the closing of exhaust to f. The piston M in the cylinder has now moved over and opens the port b, admitting expanded steam, through I) and 0, to end of outer valve, and repeats the movements in reverse direction,

In Fig. 2 the steam is admitted to the piston through space 1*.

5 What I claim as new, and desire to secure by Letters Patent, is

1. The combination, substantially as described, of a cylinder having ports G, G, and H, the inner valve or rod, A, and ports a (1/,

IO communicating with the cylinder, the outer valve, B, and its ports 0 c, and channels 0 c and 0 0 a slide-valve, O, the cylinder-ports b and b, and exhaust-ports e and c, all arranged in relation to each other as shown and speci- 2. The steam chest and cylinder, the steamports a a and b b to connect them, the outer valve, B, and its annular steam-channels c 0 and ports 0 c, and the inner valve or red, A, with its channels 0 c and having collars 20 t t, to regulate the throw of the same, in combination With the main valve G, substantially as and for the purpose described.

ABRAHAM MANNERS, J. O. CLAYTON.

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