US714410A - Valve. - Google Patents

Description

' fNo.7|4,4|o. Patented Nov. 25, 1902.

vC. H. STANTON, P. M. ARMSTRONG & J. H.l PRWSE.

H VALVE.

\App1ication'1ed Mat. 3, 1902.)

(No` `Nudel.)

Y I C K B F J RMJ /f/ 44 l/ v lIl. d l a f" ,f l U E x FIG l Wifi/sass /A/vsA/j/ TH: cams paens oo.. wo'rom'ngo.4 wAsmNm-ON. b. c. l

UNITED STATES ATENT EFICE.

CHARLES HOWELL STAINTON, PETER MAROHALL ARMSTRONG, AND JAMES II. PROWSE, OF TORONTO, CANADA.

SPECIFICATION forming part of Letters Patent No. 714,410, dated November 25, 1902. Application iiled March 3, 1902. Serial No. 96,563. (No model.)

l l I valve in which the middle part of the plug is `cut away, leaving circular ends connected by a central web. The ends of the web are of exactly the same width as the raised seats against which they fit, `so that scale cannot 2,0 accumulate on any portion of the seats while the valve is closed. The seats are raised above the inner surface of the valve-body, i or perhaps we might say have sides running at an angle with the faces of the seats. The

. best results are obtained when the sides of each seat lie substantially in planes radial` from the axis of the plug, as scale collecting on the sides is thus presented to the working faces of the web at a very inefficient angle i 3o for cutting, and the wear on the faces is thus minimized, substantially as hereinafter more specifically described and then definitely claimed.

Figure lis a vertical section of our improved t valve. Fig. 2 is a horizontal section of the saine. i

In the drawings like letters of reference ini dicate corresponding parts in both figures.

` A is the body of the valve, of ordinary con i 4o struction and suitably recessed to receive the taper-plug E. This plug is held in position in the ordinary manner by means of the screw-cap B and packing C; The plug E, itV

will benoticed, is circular at the ends; but the central portion is cut away on each side, leaving the web G. The faces of the ends of this web are less in width than the diameter of the central passage of the valve, so that when the plug is turned to a position at right 5o angles to the position shown in the drawings a clear passage-way for water or steam is left that the valve-seats D D are raised above the inner surface of the body of the valve-that is to say, each seat has well-defined ysides running back from the workingface of the seat at such an angle that scaleformingon the sides is present-ed toward the opposed face of the end of the web of the plug at a very inefficient angle for cutting the ends of the web of the plug. We prefer that these sides should lie substantially in planes radial from the center of the plug, though they might vary somewhat on either side of such plane without inatcrially spoiling the working of the valve. We might here explain that the chief difficulty in making a plug-valve which will remain iight after it has been iu use sonne time in connection with a steam-boiler lies in the fact that scale forms on all the exposed parts of the interior of the valve while the latter is in a closed position. When the plugis operated, this scale with all ordinary valves cuts the working faces and soon produces leakage.

We have overcome this difficulty by the following features of construction. In the first place the working faces of the web of the plug and the valve-seats are of exactly thesame width, so that no scale can form upon them. Scale, however, does form on the sides of the valve-seats, extending over onto the sides of the plug in a continuous sheet if the valve be left closed for some time. lf now the plug be turned, this scale is broken at the point of juncture between the sides of the plug and the valve-seats, and a rough jagged edge of extremely hard scale is left attached to the sides, which cuts and scores the working faces of the ends of the web unless the valve-seat be raised and its sides set substantially at the angle already described. It is well known that if one hard substance is to cut another it must be set so that its cutting edge is at" IOO an acute angle to the surface to be cut, as eX- ernplied in the position of a plane-iron. We find,therefore, that with the sides of the valveseat set at the angle described the scale does not cut the Wearing-faces of the Web of the plug both on account of the angle at Which it is thus presented to the ends of the web and on account of the comparative ease with which the movement of the plug when the valve is opened will strip the scale away from the point of juncture between the Web and the seats, and thus leave little or no scale to act on the ends of the Web. As a matter of fact We ind in practice that when our valve is used as a boiler bloW-oi it remains unimpaired for months, While blow-off valves of ordinary types Will become leak-y in the course of a very few Weeks. It Will be seen on reference to Fig. l that the taper-plug E is provided With a stem H, of ordinary construction, having irs projecting end square to receive a wrench for opening and closing the valve. A groove is cut at the top circular portion of the plug opposite a small groove J in the body of the valve, the channel thus formed being designed to receive a ball K, which runs therein and forms a stop to prevent the plug being turned beyond the position to properly close it; but We claim nothing for this par ticular construction.

What We claim as our invention is l. In a cut-olf valve a taper-plug having circular ends connected by a web in combination with a valve-body adapted to receive the said plug and provided with raised valve- Iseats, one at each side of its central passage,

of the same Width as the ends of the said web, substantially as described. l

2. In a cut-o valve a taper-plug having circular ends connected by a Web, the ends of the Web being less in Width than the diameter of the central passage of the valve in comhination with a valve-body adapted to receive the said plug and provided with raised valveseats, one at each side of its central passage of the same width as the ends of the said web substantially as described.

3. In a cut-oit valve a taper-plug having circular ends connected by a web in combination with a valve-body adapted to receive the said plug and provided with raised valveseats, one at each side of its central passage, of the same Width as the ends of the said web, the sides of the seats lying substantially in planes radial from the axis of the plug substantially as described.

4. In a cut-off valve a taper-plug having circular ends connected by a web, the ends of the web being less in Width than the diameter of the central passage of the valve,in cornbnation With a valve-body adapted to receive the said plug and provided with raised valveseats of the same width as the ends of the said web, the sides ot the seats being substantially in planes radial from the axis of the plug, substantially as described.

5. In a cut-O valve a taper-plug having circular ends connected by a Web, the ends of the web being less in Width than the diameter of the central passage of the valve, in combination With a valve-body adapted to receive the said plug and provided with raised valveseats of the same width as the ends of the said web each side of each seat joining the face at an angle which will not give scale forming on the side an effective cutting angle against the end of the web engaging the face substantially as described.

Dated at Toronto, February 10, 1902.

CHARLES HOWELL STAINTON. PETER MARCHALL ARMSTRONG. JAMES H. PROWSE.

Witnesses:

LEONARD FoULDs, HERBERT STAINTON.

Images