Modular selector valve assembly

Abstract

A modular multi-function selector valve assembly for controlling the flow of fluids for a plurality of dental handpieces. Each of the modules is functionally associated with one of such handpieces and, in response to the absence or presence of pilot air pressure, the multiple valves of that module simultaneously open or close passages for drive air, chip air, and water, as well as for other fluids such as exhaust air and gauge air. The modules are disposed in side-by-side relation with each other and each module is transversely divided into control and valve sections. A plurality of main and secondary flow passages are formed in the sections, and one side of each section is also provided with at least one channel communicating with certain of such passages. Flexible gaskets, interposed between adjacent modules and also between respective sections of each module, perform the multiple functions of preventing leakage from the main and secondary passages, combining with the channels to define additional flow passages, and serving as diaphragm valves for controlling fluid flow. In the embodiment disclosed, the module sections, along with their passages and cnannels, are formed by injection molding, the flexible gaskets between such sections and between successive modules are all identical, and the clamping plates which are used to secure the modules in side-by-side relation are identical but reversely oriented relative to each other.