US1970744A - Primer valve - Google Patents

Description

PRIMER VALVE 4Filed March 6, 1935 'www A TTO/PNE Y Patented Aug. 21, 1934 OFF ICE 1,970,744 f y PRIMER VALVE' n Philip S. Goss, Portland,' 0reg. Application March 6,1933,v` serial No. 659,605

` 4 claiis. (o1. isz-12)` My invention relates to devices whereby an intermittent supply of water is furnished in small quantities to a trap such as the trap of a noor drain or other infrequently used iixture to pre- 5 vent evaporation from breaking the sealof the, trap andthe advantages of the invention reside` inthe construction and combination of the parts of which it is composed.

One of the objects of my invention is to provide an appliance of the character indicated that will meter an unfailing small amount of water to a trap without wasting it and without being subjected to the disadvantage ordinarily accompanying a small metering opening that frequently not waste water.

Another object of my invention is to provide a device of the character described wherein an ain gapl is placed in the waste pipe to effectually prefY These and other objects of the invention will ber fully explained in this specification and particu-y larly pointed out inthe claims. 1

A drawing accompanies and forms apart of this specification in which,-

Fig. I is a longitudinal section of my primer Valve showing the position of the various parts when it is in full service and operating;

Fig. II is a yview of the same structure ina state f rest; Y

Both Views are sectioned in part and uniformly, to clearly delineate its construction;

Fig. III is a View of the plunger P removed from the body of the valve; and

Fig. IV is a projection of Fig. III.

A body, 1, is provided with a central bore, 2, which should be reamed and iinished smoothly on the inside. The top of the body, 3, is prei- 215 erably closed and made integral with l. At the lower end a closure, 4, is provided threaded at and provided with a seat, 6, upon which is placed a gasket, 7, of any suitable material which upon threading the two parts together will be compressed to form a watertight joint between that portion of the body indicated by la and the seat, 6. Mounted within the body, 1, is the plunger, P, which carries three bosses indicated by P1, P2 and P3. The iirst two of the bosses, P1 and P2, 55Y will be a fairly close iit in the central bore, 2,

closes entirely if made small enough so that it will though as is well known itis not possible to make such-a t soi that it will be fluid tight and remain so and neither in this case is it expedient to do this..i .Y However the t should be such that any tendency to liquid iiow from the inlet, I, towardv the outlet, O, will influence the boss P2. The boss P3 is fitted more loosely within the central bore, 2;.so that fluids can pass freely between its perimeter and the bore 2. A spring, S, is placed in the top of the eentraibore, 2, so that a slight in1ua1'65'- compression is had when the parts are in position as shown in Fig. II and this spring is made light enough so that only a few ounces of pressure are exerted against the boss P1. when the parts are in position as-shown inFigaI. i

Imbedded i in the lower 4part of the boss P3 isa valve gasket, V, being firmly held in place by thenut, N, mounted on the stem, 8, which is threadedat its lupperV end into the boss P3 as indicated at 9.v `.On the J interior surface of the closure, 4, is a raised valve seat, 10, withinwhich is a pocket, r1l, to accommodate the nut N. The stemlS as shown vextends a considerable distance below thenut N and extends at `all times through the pocketfll and through an inserted bushing., 12, and is of such further length that even when the valve is wide open, as shown in Fig. I, it will 'extend'well pastthe top of the air gap, 13, and the reason. for this is hereinafter explained. It will be noted that the inserted bushingyiz, is made slightly larger in internal diameter than the stern 8.as shown at 12a.

This valve willcustomarily be installed in a' supply line to a frequently used fixture such as a kitchen sink and the inlet I will be connected'to 90 a source of vwater supply under pressure and the outlet O will be a continuation of this water supply toward the fixture; it may be a kitchen sink as indicated. When no Water is being used at the xture a balanced pressure will exist throughout the priming valve except that there will be a hydrostatic tendency to keep the plunger P downward and the valve V in contact with the seat ring, 10, due to the dierence in area between the seat ring, 10, and the bosses, Pl and P2. This hydrostatic pressure will be in addition to the slight pressure imposed by the spring S.

As soon as a faucet is opened and water starts to flow from I toward O, the reduction in pressure on the O side of the iixture will cause pressure under P2 and Pl and that part of P3 without the seat ring 10 to raise the whole internal structure toward the position shown in Fig. I of the drawing; whereupon, a comparatively free passageway for water from I toward O will be 41V- tively strong spring must be used to prevent con,

established and the valve V will be raised off of the seat ring 10 and fluid at full pressure will tend to flow through the metering opening 12a, that is the annular space between the stem 8 and the inside of the bushing 12. This annular space or opening will ordinarily be only a few thousandths of an inch, say five thousandths of an inch if the stem 8 is made one-eighth of an inch in diameter, which is suggested as a good dimension. A thin' small stream Ofwater will then nd its way through 12a and will hug the lower end of the stem 8, having its velocity reduced to that induced by gravity and will drop ofi?)- the lower end of the stem 8 Without splashing outwardly through the air gap 13 or indeed moistening the inside of the passageway adjacent the air gap. This lack of splashing and moistening tends to cleanliness since dust will not stick if the surfaces are dry to such an extent that it will if they are damp.

The Stem 8 should be made of noncorrosive metal, nickel iron alloys are suggestedand brass and copper ordinarily willnot sufce. The bushing 12 should also be'made of a `similar metal for the reason that practically all domestic water supplies nowadays carry some vegetable acids and a small portion of chlorine and where ex. posed Ato atmospheric oxygen, as these parts are for the greater portion of the time, theyv will corrode and if left for any considerable time corrosion will cause the valve to stick.

By making the valve as I have made it with a seat rim completely independent from the open., ing or metering device, I have overcome a very serious diiculty; for if the metering opening is made small enough to limitthe flow to what will flow under a given pressure throughthe anf-v nular opening 12a. then any slight scale or sub.

stance found in the water will close it altogether and the purpose of installingthe valve will be defeated. If a small metering opening is pro vided with a valve that closes Vit directly, Very.

small pressure differential t0 keep the valve closed hydrosatically can be available and a compara tinual leakage and such a spring tends to intere. fere with water supply to the master fixture. will be noted that the instant the master fixture starts to use water the pressure differential is reversed.

failing amount ofy water and a dangerous menace' to public health will be removed. This menace is so Well appreciated that in a large number of first class cities cellar Hoor drains are not permitted to be connected to the sewer system.

Having thus fully described my invention, the manner of its use and the advantages due to its use, what I claim as new and desire to secure by Letters Patent, is:

1. A priming valve for a trap defined in part as a body member having a bore therein, a plunger in said bore that is movable under the influence of liquid flow therethrough, a valve 4member carried by said plunger, a co-operating valve seat for said valve, a metering discharge outlet vbeyond and spaced from said valve and seat, a stem projecting through said metering outlet that. is attached to the valve and movable therewith vto prevent clogging of said metering outlet, a passageway below said metering outlet, and air gaps in said passageway, the said stem being arranged to direct flow from said metering outlet pastsaid air gap.

2. In a metering outlet for a priming valve,v a tube, a stern in said tube to restrict its area, to.

an annular space between the stem andthe in, side of the tube, and a hydraulically operated valve to control the iiow through the metering outlet that is spaced therefrom', vthe said'stem being attached to said valve and movable therewith to prevent clogging of said metering 0utlet.

3, In a priming valve, a bore therein that forms a part of a conduit from a source of Water supply under pressure to a water consuming lixture, a, branch outlet from said bore to supplyy Water to a trap, a'valve controlling the branch' outlet, hydraulic means for controlling said Valve t0 open said valve under the influence of i'low projecting through said` metering openingv and* past said air gap.

4.' A priming valve for a trap denedvas albo'dy having a passageway therethrough that is part ofl a conduit from a source of water supply under pressure to a water consuming xture, a hydraulically operated plunger inv said'passageway movable under influence of flow toward said 'I ix-A ture, a valve member attached to said plunger that controls iiow to a trap, a gio-operating sea-t for said valve, a metering outlet spaced beyond' said seat, a stem attached to said valve that projects through said metering outlet to restrict its area to an annular space between the inside of the outlet and the stem, said stem being mov? able with said valve to prevent clogging of said metering outlet.

PHILIP S. GOSS;

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