US933863A - Valve. - Google Patents

Description

H. P. THOMPSON.

-VALVE.

Patented Sept. 14, 1909.

PATENT OFFICE.

HIRAM' F. THOMPSON,

OF LEXINGTON, OHIO.

VALVE.

Specification of Letters Patent.

Patented Sept. 14., 1909.

Application filed December 21, 1908. Serial No. 468,614.

To all whom it may concern:

Be it known that I, HIRAn F. THOMPSON, a citizen of the United States, residing at Lexington, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Valves, of which the following is a specification.

My invention relates to a new and original construction of valve adapted especially for use in connection with various fluids which are confined under a high pressure and require exceptionally close seats to confine the fluid and which has seating points or edges rather than broad surfaces, thereby preventing accumulations of granular particles on the seat and grinding out thereof, all substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional elevation of a valve and seat therefor according to my invention, and Figs. 2 and 3 are sectional elevations of the said parts enlarged and broken away so as to show only a fraction of each, Fig. 2 showing the parts as seated, and Fig. 3 as open.

The object and nature of the invention will be apparent from the foregoing description and views. Obviously, any construction of this general character must be practical both as to manufacture and use, and the construction shown has these essential characteristics. To these ends the valve proper indicated by V has an annular channel 2 in its bottom with side walls substantially parallel but very slightly flaring to promote casting thereof, and the inner surface of said channel is fiat and at right angles to the sides thereof. The valve seat S is an integral portion of the joint or casing O and has compound inclinations 3 and 4, respectively, on its sides adapting the same to three distinct contacts, 5, 6 and 7 with the valve or the valve with said seat. The said inclines or bevels 3 and 4 are at different angles, the opposed inclines 3 being less than the inclines 4L, which latter reduce the edge of seat S to the shape of an inverted V in cross section. The sides 3 have something of a wedge taper so that they impinge with the angular edges 5 and 6 of the-valve when the valve is seated, as in Fig. 3, and as this occurs the comparatively sharp edge 7 of the valve seat bites more or less sharply into the flat ring Gr laid in the bottom of channel 2 in the valve. Said ring may be of any suitable material but a thin ring of bronze or the like, or one having the quality or characteristic of certain grades of copper or a comparatively soft brass or like wire, serve my purpose, the idea being to have the edge 7 find and make its own seat therein though it does not seat deeply. Deep seating is not really necessary nor desirable, the idea being to have a true and comparatively sharp edge 7 which, while it seats, will not produce a cut or channel in the packing ring of such depth as to form a lodgement for particles which might lodge therein and produce imperfect closure. Again, by having the opposed sides of channel 2-substantially parallel and the sides 3 of the seat inwardly inclined in respect thereto relatively or in about the proportions shown, a drawing or gradual closure of the valve is effected which does not tend to set the edges 6 into the sides of the valve seat but rather to bring the said edges into the close contact required to effect a perfect cut off against the passage of any kind of fluid under whatever pressure. Then as this closure is supplemented by edge seat 7 an intermediate cut-off is provided which makes the valve effectually tight under all conditions of service.

Now having further reference to the construction shown it will be especially observed that while I provide for simultaneous closing of the valve at the three several contact points 5, 6 and 7, the spaces at said points vary very materially in a partially open position or when opening or closing the valve. This is seen in Fig. 3, where the valve is off its seat, and the space from edge 7 to the ring Gr is about twice as great as the space between the edges 5 and 6 and the sides 3 of the valve seat. The value and advantage of this lies especially in the protection it affords to the comparatively sharp seating edge 7 against wearing or channeling here or there by passage of water or the like under heavy pressure and which would take advantage of any possible unevenness in the said edge or its immediate seat and wear it into larger and leaking proportions. Hence I have planned to practically shut off flow at the side edges before closure at 7, and then by reason of relatively slight inclination of the sides 3 the valve can still travel to close at 7 and perfectly seal its engage ments.

What I claim is 1. A valve head having an annular channel in its bottom with'substantially parallel I being straight their full depth and having straight sides and a fiat seating ring therein, angular edges, and a; Valve seat having in combination With a valve seat isubstanstraight inclined surfaces 3 and t on each tially Wedge shape in its base portion and side and a central edge 7 at its center.

5 substantially A shaped in its upper portion In testimony whereof I affix my signature 15 in cross section and adapted to enter said in presence of two Witnesses.

channel. HIRAM F. THOMPSQN.

2. The combination of the valve head hav- Witnesses: I ing an annular channel and a flat seating ELLA THOMPSON,

10 ring therein, the side Walls of said channel FRANCES A. THOMPSON.

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