US138992A - Improvement in balanced valves - Google Patents

Description

UNITED STATEs PATENT OFFICE.

FRANK P. OADY, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TO SETH M. OADY, OF SAME PLACE.

I IMPROVEMENT IN BALANCED VALVES.

Specification forming part of Letters Patent No. 138,992, dated May 20, 1873', application filed February 21, 1873.

To all whom it may concern Be it known that I, FRANK P. OADY, of Cleveland, in the county of Guyahoga and State of Ohio, have invented a certain new and Improved Steam Balance-Valve; and I do hereby declare that the following is a full, clear, and complete description thereof, reference being had to the accompanying drawing making part of the same.

Figure l is a plan view of the valve and inside of the steam-chest. Fig. 2 is a side view of the valve and inside of the steam-chest. Fig. 3 is a transverse vertical section thereof.

Like letters of reference refer to like parts in the several views.

The object sought for in this invention is to release the valve from the direct pressure of steam upon it in one direction, by causing an equal pressure of the steam to be exerted upon it in the opposite direction, thereby placing the valve in equilibrium so far as regards the steam-pressure, making of the valve a balanced one, as hereinafter more fully described.

In the drawing, A represents an ordinary steam-chest, of which E is the seat, 0 the valve, and D the valve-rod. To the top of the valve is secured a disk, E, Fig. 2, having a central core or boss, F, Fig. 3. Around said boss is fitted looselya ring, G, the lower side of which fits close around the boss, Whereas the upper side is rabbeted out, forming an annular recess, in which are closely but loosely fitted two rings, a b, Fig. 3, one above the other, as shown. The upper surface of the ring G and the surface of the ring a are flush, one with the other, and both of which are a little above the face of the core or boss, forming a recess or chamber, 0, about equal to the chamber in the valve. Betweenthe ring G and the face of the disk E are interposed springs H, Fig. 2, the purpose of which is to keep the surface of the rings in close contact with the under side of the cover I of the chest, which is made true and smooth for that purpose, and with which it forms a close, tight joint.

The practical operation of the above-described steam-valve is as follows: It will be obvious, on examination of the drawing, that the steam will not only press down upon the surface of the valve, but also upward against the under side of the disk E; therefore, in consequence of the said valve being attached to the valve in a rigid manner, the tendency of this upward exertion of the steam will be to counterbalance its downward pressure exerted on the valve, and, as the surface of the disk is about equal to that of the valve, the valve will be equally balanced, and hence it will be easily operated, requiring only so much power as to move the weight thereof without the resistance consequent of steampressure.

To prevent the steam from getting between the surfaces of the rings G and a and that of the'cover of the chest is the purpose of the springs H, the resiliency of which keeps the rings in close contact with the surface of the cover. The rings are also made to fit steam-tight around the boss, and for that purpose the wings are cut and sprung on around the boss.

Claim.

purpose set forth.

FRANK P; OADY. Witnesses:

J. H. BURRIDGE, A. F. CORNELL.

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