US167754A

US167754A - Improvement in oscillating balanced valves

Info

Publication number: US167754A
Authority: US
Publication date: 1875-09-14
Anticipated expiration: 1892-09-14

Description

AQW. ELBRE DGL- Oscillating Balanced Valve.

Patented Sept. 14,1875.

NJETERS, PHDTO-LITHOGRAFHER, WASHING ON, D C.

UNITED STATEs PATENT OFFICE.

ALONZO W. ELDREDGE, OF BIG RAPIDS, ASSIGNOR OF ONE-FOURTH HIS RIGHT TO FITCH PHELPS, OF MEOOSTA, MICHIGAN.

IMPROVEMENT IN OSCILLATING BALANCED VALVES.

Specification forming part of Letters Patent No. 167,754, dated September 14, 1875; application filed June 17, 1875.

To all whom it may concern;

Be it known that I, ALONZO W. EL- DREDGE, of Big Rapids, in the county of Mecosta and State of Michigan, have invented an Improvement in Steam-Engines, of which the following is a specification The nature of my invention relates to an improved form of balanced oscillating valves for a steamengine; and consists in the peculiar construction of an elevated valveseat, and the combination therewith of two circular valves, one at each side, mounted on a rock-shaft which oscillates through the axis of said seat. I

Figure 1 is a perspective View, with a portion of the steam-chest broken away. Fig. 2 is a longitudinal vertical section at :10 as. Fig. 3 is a transverse vertical section at y y. Fig. 4 is an elevation of the face of one valve. Fig. 5 is a cross-section of the same at z z.

In the drawing, A represents that part of a steam cylinder which is included in the steam -chest, having the steam -ports a a, with an exhaustport, b, between them. B is a longitudinally-disposed elevated valveseat, bolted to the ordinary. valveseat A. Two transverse ports, a a are radially cut through the raised seat, with a passage from each leading down to the port a below it. Between the ports a an exhaustport, 1), extends transversely through the seat, and from the interior a short passage communicates with the exhaust-port b of the cylinder.

The sides or checks of the seat B are circular, and through the axis is cored a bearing-tube, c, for the rock shaft 0. The seat, above the ports a a is cored out, forming a sector-shaped chamber.

D D are two disk-valves, each formed with a radial steam port, ed, at each side of a radial exhaustrecess, b cored in its inner face, and is axially mounted on the rock-shaft O. E is the steam chest, bolted to the cylinder, and is provided with the heads E E, one at each side, through one of which the rock-shaft oscillates in a stuffing-box,F. Near the periphery of each valve an annular groove is turned in its face, and another one close to the central eye, through which the rock-shaft is inserted. At each side of each steam-port a radial groove is planed in the valve face, extending from the inner to the outer groove.

In the annular grooves brass or other packing-rings c-are laid in, and in the radial grooves a packingbar, 0, is laid in each, which rings and bars may be set out, either by springs under them or by steam-pressure, as preferred, their purpose being to relieve the face of the valve from wear, and to prevent steam from blowing through from port to port.

The valves are adjustably secured on the rock-shaft by set-screws tapped through their hubs, and may be set up to the seat as oocasion may require. The protruding end of the rock-shaft is fitted with an arm, (3, with which an eccentric rod may engage to oscillate the shaft and valves.

The pressure of the steam being on both valves, the seat is relieved from pressure of the valves upon the same, as the pressure of one valve is balanced by that of the other in the opposite direction through the rockshaft.

A steam-port, c of the seat being disclosed by the port a of the valve at each side, steam will flow through the passage of the port a of that end of the cylinder, while the ports a a of the other end of the cylinder will beclosed by the valves; but the port chest and into the upper part or chamber of the valve-seat, in each side of which, at the lowest corner, there is tapped a very small aperture, g, which is disclosed by a valve port for an instant at each oscillation of the valves, thereby permitti-ng a minute quantity of oil to flow out, which is absorbed by the steam, and thus lubricates allthe moving parts with which it is brought into contact.

The valves for the larger class of engines may be cast with lugs at their peripheries, projecting beyond the edge of the chest, and

nation with the hollow elevated valve-seat B, provided with the ports a a N, substantially staybraces provided to connect the lugs of as and for the purpose set forth. one valve with those of the other, to prevent the valves from springing.

What I claim as my invention is- The valves D D, constructed as described, and mounted upon the rock-shaft G, in combi- ALONZO W. ELDBEDGE. Witnesses:

E. F. DEWEY, F. D. BROWN.