Rotary valve assembly

Claim 1

A valve comprising a housing formed with a cylindrical bore opening at one end of said housing and terminating at its other end within said housing; a cylindrical core fixed coaxially within said bore in sealed relation to the bore's said other end, said core being of lesser diameter than said bore to provide an intervening cylindrical area between the bore and the core; a one piece, inverted-cup-shaped valve element having a depending cylindrical wall extending with a close sliding fit within said intervening cylindrical area substantially throughout the axial dimensions of said core, and a radially extending top, integral with said depending cylindrical wall; a manually operable one piece inverted-cup-shaped knob having a radially extending portion intimately overlying said top of the valve element, said knob and the top of the valve element being provided with coacting recesses and dogs constraining the knob and the valve element to turn in unison; a generally ell shaped fluid passage in said core communicating between a central area at the bottom of the core and a side area at one side of the core, separate fluid passages in said housing connecting said central and side areas of the core with distal fluid supply and fluid discharge areas; said depending cylindrical wall of the valve element having an opening of limited size, alignable with a side end of said ell shaped passage by turning of said valve element to permit fluid flow from the latter passage to one of said separate fluid passages in the housing; and said fluid flow being discontinuable by turning of said valve element to bring said opening into non-alignment with said side end of the ell shaped passage.