Non-freeze wall hydrant with vacuum breaker

摘要

In a wall hydrant, a wall-penetrating straight tubular conduit; a valving member movable axially in and out of sealing engagement with a reduced inlet connection valving bore; a hollow cylindrical end casting on the conduit outer end providing a lateral conduit outlet opening from a discharge bore; a plug in the outer casting end having a threaded aperture with a key-rotated stem threaded therethrough connected with a shaft to axially shift, upon rotation, the valving member moved by the shaft inner end and a shaft-carried flange slideably "O"-ring sealable on an interior surface controlling exterior draining and air vent openings associated with the plug; the valving and flange seals spaced, relative to the controlling surface and inlet bore spacing, for conduit drainage and vent opening after inlet closure; also in combination with the hydrant a wall box, a vacuum breaker and air inlet device including an integral enlargement on the casting outlet, a cap secured thereon with a hose connection as the hydrant final discharge and having air vents, a molded flexible elastomeric hollow element with cylindrical and open- ended conical inner end portions fitted into the mating enlargement end and having a conical outer end portion in the cap normally sealing the vents, and a member with a head within the flexible element shiftable outwardly with water flow against the outer conical portion to increase vent sealing pressure and gravitationally biased back toward the inner conical portion, the head plurally through-apertured at locations radially inward of vent closing seal contact, and the inner portion having a spacer formation preventing aperture closure by head contact therewith, the outer conical end of the molded element being flexible inwardly to open the vents, and on further flexing to seal upon a head outward projection, whereby with the head gravitationally moved against the spacer and the other end sealed by the element, back flow is prevented and the air vents opened for hose drainage and/or vacuum breaking.