Valve structure

DETAILED DESCRIPTION The invention is claimed as follows: 1.
A valve comprising a valve body including a base wall section and an axial wall section cooperating to define an open ended valve cavity having an inner wall surface; plug means rotatably mounted with respect to said valve body and including an end segment disposed in said valve cavity from the open end thereof, said end segment including a concave end face spaced from said base wall section to define a valve chamber; at least two inlet ports means communicating with said valve cavity through said axial wall section, said inlet port means being disposed generally parallel to each other and opening in the same direction, outlet port means communicating with said valve cavity at all times without regard for the relative position of said plug; said end segment having an outer wall surface which includes at least a pair of axially elongate concaved surface portions extending to the end face of said end segment, and separated by axially elongate convexed surface portions, the major diameter of said end segment being slightly greater than the diameter of said valve cavity, and said end segment being hollow and constructed of a resilient material, such that upon assembly said end segment will be resiliently and elastically deformed, with said concave surface portions facilitating said deformation, and the tendency of said end segment to return to its original condition forcing said convexed surface portions into sealing engagement with the wall surface of said valve cavity, said concaved portions cooperating with said inner wall surface upon assembly to provide a pair of separate channels opening to said valve chamber, said convex surface portions including a first portion having a circumferential extent greater than the maximum distance between said inlet port means and being in firm sealed contact with said valve cavity wall surface and adapted to overlie and block said inlet port means, and a second convexed surface portion having a circumferential extent less than the minimum distance between said inlet port means whereby said plug means can be rotated to select the relative position of said concaved and convexed surface portions with respect to said inlet port means, or said plug may be positioned with said concaved surface portions providing communication between said valve chamber and one, or the other, or both of said inlet port means