US1016461A - Gate-valve. - Google Patents

Description

A. WATSON.

GATE VALVE. APPLICATION FILED SBPT.2'7,1911.

Zgfivaaaea- Patented Feb. 6, 1912.

UNITED STATES PATENT OFFICE;

ALEXANDER WATSON, 0F BEACI-IMON'I, MASSACHUSETTS, ASSIGNOR TO BYRON C. LEAVITT, TRUSTEE, OF DUXBURY, MASSACHUSETTS.

GATE-VALVE.

Specification of Letters Patent.

Patented Feb. 6, 1912.

To all whomz't may concern Be it known that I, ALEXANDER VVATSON, a citizen of the United States, and resident of Beachmont, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Gate-Valves, of which the following is a specification.

My invention relates to the construction of gate valves and has for its object the production of a simplified and reliable gate valve requiring a minimum of machine work and affording all the advantages incident to a clear straight passage for fluids when the valve is open;

In the drawings hereto annexed which illustrate my inventionFigure 1 is a vertical section of a valve showing some of the parts in elevation and others in dotted lines; Fig. 2 is a top plan view of the valve casing with the hood thereof removed; Fig. 3 is a top plan view of the valve and its carrier; and Fig. 4 is aside view of the valve and its carrier and a portion of the operating means.

The valve casing comprises a main oham= ber C, an inlet branch I and outlet branch 0., these two branches being preferably in the same axial line. The main chamber G extends at right angles to the inlet I and outlet 0 to a distance sufiicient to provide a housing for the valve when the latter is fully open. A portion of the wall of the main chamber is made thicker than the remainder so that this portion indicated by C has an internal surface slightly smaller in radius than the general internal surface of the main chamber C. The surface of this portion C constitutes the valve seat and extends for a substantial distance on either side of the inlet opening. A guiding groove at each side of the interior ofthis main chamber 0 is provided by the ribs R, R. the tops of which are approximately flush with the cylindrical surface which would be formed by a continuation of the cont-our of the valve seating surface at C. The inlet and outlet openings I and O are internally threaded as usual. The upper end of the main chamber C is externally threaded and the internal machining of the valve casing is accomplished by the introduction of a reamer which perfects the cylindrical surface of the said portion C and at the same time reams a flat seat at that end of the chamber G which may be called the bottom.

at C It will be observed by reference to Fig. 2, that the introduction of such a reamer will leave the ribs R, R, untouched or at all events, will not remove enough material from them to affect their utility which is presently to be described.

A cap or hood H screws onto the top of the chamber C and receives at its threaded upper end a threaded extension of the sleeve N which has also a similar threaded extension which takes the gland nut G.

A stem S provided wit-h a collar S and having its lower portion threaded at S passes through the passage provided by the nut G, sleeve N, and cap H. The collar S which is preferably integral with the stem S is confined between an internal shoulder h and the threaded projection of the sleeve N.

The gate valve shown in dotted lines in Fig. 1 is a hollow block generally cylindrical in form provided with a lateral extension or protuberance V, which is turned or ground to a true cylindrical surface sized to fit accurately the cylindrical seat C. The radial dimension of the valve V is greatest on the side where the said portion V is located. the opposite and remaining portion at V being materially smaller in radius that is to say, contained well within a circle produced by the radius of the part V. Thus the gate valve as a whole fits loosely in the main chamber C of the valve casing. The lower end of the gate valve is squared off so as to rest and slide on the bottom seat 0. The valve is provided with opposite slots V which are inclined. A valve carrier consisting of the nut portion A and lateral extensions A, the nut portion being centrallv threaded to receive the threaded portion c of the valve stem is made of such dimensions that it can he slip ed sidewise through either of the slots V into the interior of the valve V;

The valve V may be economically manufactured bv being die-cast since this mode of roduct'ionwill render it unnecessary to mill or slot the slots V The valve casting may then be chucked by means of an aperture w and the surface V may then be turned or ground or both. Accurate facing of the bottom of the valve V will not be necessarv. die-casting being sufiiciently accurate in its results.

In the specific construction herein shown the valve is assembled by first inserting the carrier A into the interior of the valve V threading the portion S of the stem S into the nut part of the. carrier A, the cap I-I, sleeve N and gland nut G having previously been assembled, then slipping the projecting arms A into the guides formed by the ribs R, R, sliding the valve and its carrier into the chamber C and then screwing on the cap H.

WVhen the valve stem S is turned so as to raise the valve carrier the inclination of the slots V causes the cylindrical surface V of the valve-to be released from the valve seat C and when the arms A guided between the ribs R, R, reach the ends of the slots V the entire valve will be lifted into the housing provided by the chamber C leaving a substantially clear passage for fluids from the inlet I to the outlet 0. The reverse movement of the valve stem first lowers the valve into place and then by-the wedging action of the slots V? slides the valve laterally on the bottom seat C until the cylindrical valve surface V seats itself upon the cylindrical seat surface C. It is considered desirable to shape the valve casing'so that a clearance chamber C will be. provided beneath the valve V.

.Generically speaking the lowering and lateral wedging of a valve to its seat is an operation embodied in sundry old and well known structures but so far as I am 1nformed these structures all involve a double valve of which the members seat in opposite directions and necessitate more parts and more diflicult machine work than has been found commercially practicable. By dispensing with one of the valve membersI have obviated the necessity of making two such members with lnterlocking or'telescoping parts and by employing a cylindrical surface and seat .on the single wedging member and the casing respectively .I provide engaging surfaces of such ample extent (and yet in reasonably small compass) that only moderate lateral pressure is required to secure the necessary tightness of the valve. By so modifying and adapting the structure of the valve member the single wedged member suflices, and the employment of a single wedged member of cylindrical seating surface reduces the machine operations to a practical minimum, no more in fact than have to be performed in the manufacture of the common globe valve. I claim V I 1. In a valve, a casing provided with a cylindrical valve-seat, a cylindrical gate valve loosely fitting in the casing, the body of said cylindrical gate valve being hollow, and the sides provided with opposite inclined slots, a valve carrier within the hollow valve having arms projecting through said slots into guides on the interior of the valve casin said guides, and externally manipulabIe means to raise and lower the carrier for the purposes herein stated.

2. In a valve, a casing having a main chamber cylindrical in general contour, a valve seat, a portion of the interior surface of said chamber having a smaller radius than the remaining portions, parallel ridges on either side of said chamber the tops of the ridges being substantially in the same cylindrical surface as the said valve seat portion, a smooth flat seat at the bottom of the main chamber having a circumference substantially coincident with the valve-seat cylindrical surface, a cylindrical gate valve, having a face to fit the said valve and portion of the casing surface, the said valve having its maximum radius at said face, the body of the valve being hollow and its sides provided with inclined slots, a valve carrier within the hollow valve having arms projecting through said slots into guides on the interior of the valve casing, said guides, and externally manipulable means to raise and lower the carrier for the purposes herein stated.

3. In a valve, a casing having a cylindrical valve seat at one side, ahollow cylindrical gate valve loosely fitting in the casing and having a projecting sector on which is the seating surface, to fit said valve seat, the rear of the valve being smaller in radius to aiford clearance, and the sides thereof provided with opposite inclined slots, a valve carrier within the hollow valve having arms projecting -through said slots'into guides on the interior of vthe valve casing, said guides and externally manipulable means to raise and lower the carrier for the purposes herein stated.

4. In a valve, a casing having a cylindrical hollow seat at one side, a hollow cylindricalgate valve loosely fitting in the casing and having a projecting sector on which is the seating surface, to fit said valve seat, the rear of the valve being smaller in radius to afford clearance, and the sides thereof provided with opposite inclined slots, a valve carrier consisting of a nut having two projecting arms, said nut within the valve, and the arms projecting through said slots into guides on the interior of the casing, said guides, and a threaded valve stem engaging said nut, to raise and lower the carrier for the purposes herein stated.

Signed by me at Boston, Massachusetts, this 15th day of September 1911.

ALEXANDER WATSON.

IVit-nesses CHARLES D. WOODBERRY, ODEN ROBERTS.

i Copies of this patentmay be obtained for .f ve cents each, by addressing the Commissioner of Patents,

' Washington, D. G.

Images