US898856A - Dry-pipe valve. - Google Patents

Description

13. EVANS. DRY PIPE VALVE.

APPLICATION FILED DEO.4,1907.

% a sums-8mm: 1.

P. EVANS.

DRY PIPE VALVE.

' APPLICATION FILED 9204,1907.

898,856. Patented Sept. 15,1908.

2 SHEETS-SHEET 2.

l; nns, or PHILADELPHL\, P1; KLER F PHlLADELPHIA, PENN \NSYLVANIA, ASSlti-XOR l(,) INTERN A'llOXi n. s PRIN- SYLVANIA, A GORPORATION' Oi. PENXSYL ;\L ll;l.

DRY-PIPE VALVE.

No. assess.

Specification of Letters Patent.

Patented Sept. 15, 1908.

Application filed December 4, 1907. Serial No. 405,086.

T 0 all whom it may COTLCQ'WIL.

Be it known that I, POWELL EVANS, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in. Dry-Pipe Valves, of which the following is a specificatimi.

()ne object of-iny invention is to valveof the claimed in my Patents Nos. 695,294, dated March 11, 1902, and 731,877, dated June 23, 1903, which shall possess certain improvements in the detail construction of its mechanism, with the idea of making the device a whole more ellicient and certain in its action, as well as simpler in construction than heretofore. These objects I attain in the following manner, reference being bad to the accompanying drawings, in which:-

Figure 1, is a vertical section of my improved valve; Fig. 2, is a rear elevation of the body-oi the valve; the various levers, etc, constituting its mechanism being omitted; Fig. 3, is a horizontal section taken on the line 3-3, Fig. 2, and Figs. 4, 5, and 6, are vertical sections illustrating some of the various forms which may be given to the bearing piece between certain portions ol the provide a mechanism employed in my valve.

In the above drawings, A represents the main casting or body of the valve which is normally carried upon a foot casting B and is divided into chambers a, a and c Between the first two o'l those is placed a valve seat a and between the last two is a second valve seat a while the chamber a has in its rear wall an opei'iing in which is set a third valve seat (1 The main cast ing has an inlet opening into the chamb r (L and is'providcd with two valves and 1), ol' which the first is capable of engaging either ol the valve seats a" or a, while the second isprovided with an integral lug or projection (1 and a pin (1 whereby it is mounted in the chamber of so as to, be capable oi engaging the seat (a The main casting A also has in oncsidcopenings into the chambers (1 and (1 and these are both normally closed by a single cover plate A, which is, as shown in Fig. 2%, hinged to suitable lugs 11 screwed into said main valve casting. Between said cover and'the valve body A is placed a gasket 0, and said cover is nori'nally maintained in position to close the two openings into the chambers c and (1/ by means of bolts to.

A bracket e bolted to the outside of the general type described and i l 1 g l l i I l main casting A and is so made as to )rovide a seat for a knife edge e fixed to a lever E which is ordinarily known as the hook. This lever has extending through it a set screw 6 and there is, provided a compression member 00 F mounted on a pair of arms f pivoted to the foot casting B at f which is designed to transmit pressure between the valve or clapper C and the lever E through this set screw. Said member F ii idly fixed to the clapper C and is slotted at its middle portion to permit oi the passage of a second compression member or strut G, to which is loosely connectcd a pin f extending through a slot in said strut.

A small lever H known as a tu1nblei" is mounted upon a knife edge It carried by the foot casting B and is so constructed that one of its'arms is capable ol' engaging the lower end of the strut (l. The valve D has a projecting portion d on its under face in which is a concave recess for the reception of the upper end of this same strut, A third lever K is mounted upon a pin is supported by the foot casting B and has an arm placed to be engaged by the second arm of the lever constituting the tumbler II. There is also mounted upon this third lever and held to it in any suitable or desired manner a piece It, preferably though not necessarily of cylindrical form, which extends substantially par allel to the axis of the pin it. This bearing piece is so placed as to be engaged by the long or downwardly extending arm of the hook E. which, as shown in Fig. 1, is preferably made plane at its end so as to engage tangentially with the bearing piece /r. The head or main portion oi the lever K has an integral arm it upon which is mounted a Weight It" held in place by a nut. in addition, a connecting link 1, extends from the lower end of the hook E to the upper portion. ol the weight it, being pinned loosely to both of these elements. That portion of the nieclninism above described which is outside ol the main valve 10o body inclosed within a two part casing M.

As is well understood by those skilled in this art, under conditions of nsethe various parts are in the positions illustrated in Fig. 1, andthe valve is so connected to the other parts oi a dry pipe system that water under pressure is admitted to the chamber a, butis prevented from moving the valve C, by air p ressure exerted upon the valve D and transmitted therefrom through the strut G, tumpression member F. pressure Within the chamber 0, falls below a bler H, weight-lever K, hook E, and com If for any reason the predetermined point, the weight lever K, as

' well'as theair pressure against the valve G,

acts to lift the valve Dz. When the various parts are so moved that the valve C is caused to enga e the valve seat a it will completely close 0 the chamber a, from .the atmosphere. .Water is now freeto pass from the chamber a through the chamber aand into the chamber cf; the valve D being swung u ward and back on its hinge pin. It is to enoted that the upper part of the main casting A is extended to the rear, thereby enlarging the chamber a sufiiciently to permit the valve D to lie completely to one side of the cnrrent of 'fiuid passing through the valve structure.

It will be noted that by the use .of a cylindrical bearingpiece k the surface of contact between the hook E and the weight lever K is reduced to a minimum, the leverages are made constant, and the turningof the weight lever on its pivot when the movement of the valve D causes it to be released from the tumbler, is greatly facilitated.

By the provision ofa single door or cover for closing the two openings in the chamber a/ and a on the side of the main casting, the construction is materially simplified and the labor of getting into the valve for the purposes of inspection etc., is materially lessened. By makin the weight k separate or removable from t e balance of theweight lever, I am enabled to make it of relatively cheap material, such as lead or cast iron, and yetat the same time constructthose parts of the lever whlch'are SllbJBOl) to stram and posslble corroslon, of stronger, non-corrosivematerial such as bronze. As is obvious, the manner of assembling the parts of the weight lever is a relatively simple operation.

While in Figs. 1 and 4 I have shown the preferred form of the bearing iece 7c eniloyed between the hook E an the weight ever K, I may, if desired, use bearing pieces of other forms such as those shown at k in Fig. 5, or k as shown in Fig. 6; it being necessary in any case that there be but a line bearing between the bearing piece and the hook E and that the distance of this .line bearing from the axis of movement of the weight lever K remains constant irrespective of the position of said lever.

I claim: 1. The combination in a dry pipe valve of a casing, a plurality of valves controlling the flow of fluid through said casing, and mechanism operatively connecting said valves, said mechanism includin a lurality of levers of which one is compose o a non-corrodible metal, with a weight made of some'other" I POWELL EVANS.

Witnesses WM. E. WATERs', 4 W. CLAYTON NEWBOLD.

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