US1705169A - Automatic shut-off valve - Google Patents

Description

W. L'. ABEL AUTOMATIC SHUT-OFF VALVE Marh 12, 1929.

Filed NON. l5, 1927 8. W a yf f 3 a; .7 Z ,M// v |1|| J5 Wm Z mmm ParenteelL Mar. 12, 1929.

UNITED STATES WALTER L. ABEL, OF HOMINY, GKLAHOMA.

AUTOMATIC SHUT-'DFF VALVE.

Application filed November 15, 1927. Serial No. 233,390.

This invention relates to improvements in shut-oil;l valves which are designed to shut ofi the flow therethrough of gas or liquid' under pressure.

rlhe primary object of the present invention is to provide an improved valve which will automatically shut oil the 'flow of or liquid therethrough when the pressure of the latter unduly lowers or discontinues from any cause7 and which will thereafter continue to act as a positive shut-oil1 for said flow until said valve is manually opened.

A further object is to provide an automatic shut-oli valve that shall be positive in acti-on, simple in construction, not liable to readily get out of working order, and cheap to manufacture.

The invention consists in the novel torni, combination and arrangement o'i parts hereinafter more ully described, shown in the accompanying drawing and claimed.

In the drawing:

Figure 1 is a side elevational view ot a shut-oft valve embodying the present invention.

Figure 2 is a central vertical sectional view thereof;

Figure 3 is a transverse horizontal section on line 3-3 of Figure 1; and

Figure 4 is an elevational view of the movable valve element, and illustrating a modilied form of stem or the piston of said element. f

Referring more in detail to the drawing, 5 indicates an upright cylindrical casing closed at the top by a screw cap 6 and having a side inlet connection 7 and a bottom outlet connection 8 for being respectively coupled or connected to gas or fluid supply and outlet pipes. The casing has a bottom outlet port formed to provide a seat 11 for a downwardly seating weighted ball valve 12 which is suspended by a chain 12L from a hollow piston 12b having a rigid rod or stein 13 that is arranged axially of the casing 5. The inlet port of the connection or nipple 7 is disposed intermediate the ends of the casing, as shown.

The piston 12zt is fitted and reciprocable in the casing 5, and the ball valve 12 normally lowers by gravity to closed or seated position with the piston disposed below the side inlet as shown by dotted lines inFigure 2.

The stem 13 slidably projects upwardly through a central aperture 18 in the cap 6 as well as through a hollow boss 19 on said 1n operation, the cap 21 is removed and stem 13 is lifted to open the valve 12 with piston valve 12" disposed above the inlet port, so that unobstructed liow et the gas or liquid may be had through the casing 5 when the outlet line opened. The pressure o1 the gas or liquid acting on the under side of the piston 12b will result in retaining the valve open as long as the pressure is maintained in the supply. line or in not unduly lowered therein.

Should the pressure be discontinued or unduly lowered 'from any cause, the weight of ball valve 12 will cause the latter to lower to closed position on seat 11, and should 'the pressure be thereaiter continued again or raised to normal, the saine will aet on top of piston 12b and hold the valve closed. 1t is, therefore, evident that the flow ot the gas orliquid will be el'l'ectively cut oli" until the valve 12 is again manually opened.

The lowering movement of piston 12b may be limited by internal stop lugs 22 on easing 5 below the inlet connection 7. y

The under side oi cap 6 is preferably recessed about the opening 18V to Atorni a con-- cavo-spherical seat 23, and the top 24 of piston 12b is shaped to lit and engage this seat, when raised, so as to prevent leakage of the gas or fluid out through opening 18 should it possibly leak between the casing and the piston when the valve is open.

lt desired, the cap 21 may be dispensed with, and the upper end of stein` 13 may be formed with a linger piece or loop 25 to facilitate grasping thereof to open the valve, as shown in Figure 4. Y

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. An automatic or liquid shut-oli" Vvalve comprising an. upright cylindrical casing closed at its upper end and having a side inlet port and a bottom outlet port, a stem disposed axially oi the casing and having a rigid piston at its lower end, a weighted ball valve suspended from the piston and adapted to seat downwardly to normally close said outlet port, said stem slidzibly projecting through the top of the Casingfsaicl piston loeing adapted to move above the inlet port when tlie Valve is raised to ogen position and being Slidztbly fitted in the casing, the top of the Casing' being loi'ined with e seat on .the under eide tlieieo' about the Stein, seid piston being adapted and shaped et the top to engage the latter seat when the Valve is opened to prevent leakage through the top of the casing.

2. ln an automatic gas oi' liquid sluit-oli1 vulve comprising :in upright cylindrical easing closed at its uppei end und having e. Side inlet port and aV bottoinoutl et port, e stein disposeclaxielly-of the easing'and lievingeiigid piston-at its loweiI end, u weighted ball vulve suspended from the rpiston and adapted to Seat downwardly to normally close seid outlet port, seid stein slidebly I Jiojeeting through the top of the easing, Seid piston being' adopted to inove'ziliove the inlet port when tlie Valve is raised to open position, unl being,v elitlably iittecl in the casing, and internal stop lugs o n the easing below the inlet poi-t foi' limiting the lowering ii'iovement ofthe piston.

In testimony Wliei'eoiz l etlix my Signature.

t VALTER .L AB EL.

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