Full flow with shutoff and selective drainage control valve

Claim 1

A valve comprising: a valve body defining a first and a second fluid flow orifice and a valve stem means defining a third fluid flow orifice; said valve body comprises a cylindrical cavity wherein said first and second orifices are located in diametrically disposed positions on said valve body and wherein said cylindrical cavity further comprises a longitudinal bore communicating with said third orifice located in said valve stem means; said valve stem means operatively engaging said valve body and adapted to be rotatable and to be movable axially with respect to said valve body; said valve stem means comprising a cylindrical stem having upper and lower apertures spaced apart and parallel to each other and having a bore in said stem to form said third orifice up to said lower aperture and a third aperture in said stem intersecting said lower aperture at 90* horizontally to form a double-leg T-shaped bore having the legs of the tee separated geometrically by 90*; positioning means in said valve body for aligning said upper aperture with said first and second orifices while simultaneously preventing said lower aperture from any possible alignment with said first and second orifices to permit full flow between said first and second orifices; means for rotating said valve stem means in said valve body to prevent fluid flow between said first and second orifices when said upper aperture is rotated 90* from its full flow position; and actuating means for aligning said lower aperture with said first and second orifices while simultaneously preventing said upper aperture from any possible alignment with said first and second orifices to permit flow between all of said first, second and third orifices, rotation of said lower aperture by 90* permits fluid to flow only between said first and said third orifices and rotation by an additional 180* into an alternate selective position permits fluid flow only between said second and third orifices.