Two part lip sealing mixing valve for lavatories, sinks, etc.

Claim 1

In a mixing valve structure: a. a valve body having means forming a substantially cylindrical valve chamber; b. means forming hot and cold water inlet openings into the chamber at angularly spaced locations thereof; c. a valve stem extending into said chamber and having a substantially cylindrical exterior surface portion movable to oppose said inlet openings; d. a cage-like support attached to said body and having a hollow, substantially cylindrical portion interposed between said inlets and said valve stem, said cylindrical portion having a pair of angularly spaced, outwardly facing recesses respectively facing the hot and cold water inlets respectively, said recesses having inner walls provided with openings to the interior of said hollow portion for communication with said valve stem; e. a pair of sealing members made of flexible material fitted in said support recesses respectively, said sealing members each having a port establishing communication between its inlet, through the support recess opening to the stem; f. each sealing member having a bead protruding through the corresponding recess opening for cooperation with said valve stem on the inside of said hollow portion; g. said sealing members respectively extending entirely about the inward axial projection of the corresponding inlet opening to form operative static seals around the insides of the corresponding inlet openings; h. each of said ports having an intermediate recessed enlargement forming an atrium subjected to supply inlet pressure to expand the sealing member into sealing engagement with the edges about the corresponding inlet opening and to urge the corresponding bead into sealing engagement with said cylindrical surface portion of said stem when the stem is in closed position; i. said valve stem having flow channel means adjoining the cylindrical surface portion to control flow into said valve chamber from the inlet openings in accordance with the angular and axial positions of said valve stem; j. said sealing members forming the only operable static and dynamic seals between said inlet openings and the exterior surface of said valve stem.