Single control proportioning valve for liquids

Abstract

A simplified, economical and improved single control proportioning valve for liquids which is devoid of a conventional valve body and which responds accurately to actuation of the single control despite no requirement for close tolerances in the component parts. The proportioning valve has a simple support adapted to be mounted on a sink, a pair of supply pipes for pressurized liquids associated with the support, a pair of spaced resilient tubes, corresponding ends thereof being in communication with the discharge ends of the supply pipes, a spout on the support communicating with the other ends of the resilient tubes, an elongated control cam extending between and in engagement with the resilient tubes to vary the internal cross sectional areas of the tubes, the cam being rotatable and axially movable and having a cylindrical valve-closing length and an eccentric conical valve-opening length that controls rate of flow and proportioning, and dual bearing means on the support for the cam at opposite end portions of the cam, the dual bearing means being effective to stabilize the cam against disruptive lateral and axial movements which in the absence of the dual bearing means tend to result from pressures exerted on the cam by the resilient tubes due to the pressurized liquids therein. The disclosed valve also includes structure which cooperates to mix thoroughly the proportioned fluids, and to reduce noise to an acceptably low level.