SELF-SEALING MIXTURE VALVE UNIT FOR SINGLE-HANDLED SINK OR LAVATORY FIXTURE

摘要

The mixing valve unit comprises a generally cylindrical valve body made of flexible material capable of conforming to companion structures whereby the body itself seals against companion structures under the influence of fluid pressure. The body has a pair of large diameter inlets at opposite ends whereby thin cylindrical walls of the valve body remain. The inlets respectively terminate at their inner ends at spaced flexible convex walls. The inside concave surfaces of the walls complement each other to form a transverse bore into which is fitted a relatively rigid valve control member or stem. The stem has flow control holes both opening into a central chamber, the flow control holes being registrable with small ports in the flexible walls. Angular movement of the stem controls proportion and axial movement controls volume, all in a well known cylindrical coordinate mixing valve system. The body is removably inserted into a simple cylindrical bore of a casting. The thin cylindrical walls of the valve body flex to achieve seals with the casting while the central arcuate walls flex to achieve seals with the valve stem.