US 3,952,770 AGranted

Non-freeze wall hydrant with vacuum breaker

OwnerIrlin H. Botnickinventor

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Abstract

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.

In a wall hydrant including a building wall penetrating straight tubular conduit element, a water pipe inlet connection element joined on one end of the conduit element as a hydrant inner end, and a hollow open-ended operating and discharge end element with its inner end joined on the other end of the conduit element, as a hydrant outer end to be accessible at the outside of the building wall, the discharge end element having a lateral outlet, said element s constituting a hydrant body, and a water valving member axially shiftable in and out of an inlet passage closing position at a valving bore of said inlet element for opening and closing the hydrant, the structure comprising:

operating shaft means extending through and axially shiftably supported in said body to shift axially said valving member in and out of said closing position,
a closure element secured to and sealed in the other, outer, end of said discharge element as a plug and providing
an end wall with a threaded central aperture coaxially aligned with the conduit element and said valving bore and having said shaft means threaded therethrough to be rotationally operated to effect axial shifting,
said closure element and said discharge element defining a valving recess between the location of said outlet and end wall,
said recess comprising two hollow cylindrical wall portions of different diameters and joined through a circumferential wall shoulder, with at least that cylindrical wall portion having the smaller diameter being coaxial with said shaft means, air inlet and drainage outlet passages running to the hydrant exterior, opening at the plug outer end, and having passage inner ends opening in said recess at circumferentially spaced wall locations therein,
said shaft means including
a concentric radial flange therewith axially shiftable past said shoulder into and out of, and rotationally and slideably sealable with the cylindrical wall of, the recess portion of smaller diameter,
said passage inner ends being so located that, upon hydrant closing motion, radial flange escape from the recess portion of smaller diameter opens the interior of said discharge end element to said passages;
said valving member being moved by said shaft means to a closed position before said flange escape;
whereafter continued shaft rotation in hydrant closing direction continues shift of the flange to an escape enabling hydrant drainage and venting.

7 more elements

Abstract

Claims9