Patent ID: 6935358
Filing Date: 2005-08-30
Classification: E03B,E03C,F16K,Y10T

Abstract:
1. In a dual hydrant, the combination comprising a) two spaced apart tubular bodies to receive in-flow of fluids A and B, b) a fluid mixing zone to receive fluids A and B from said bodies, c) manually operable flow control valves in the two tubular bodies, d) primary and secondary check valves in the respective bodies to pass forward fluid flow toward said mixing zone, and to block reverse flow in one or both bodies, there being sliding plungers carrying said check valves, e) and a main outlet from said mixing zone, f) and a side check valve proximate said outlet to block sideward flow from said outlet, and to allow air entry sidewardly into said outlet, whereby when said primary and secondary check valves are closed, said main outlet is blocked by an outlet check valve to hold pressure in an outlet hose, and pressure in the mixing zone is reduced, said side check valve is opened, g) there being no side outlet ports controlled by said outlet check valve, h) said mixing zone being defined by an interconnection tube extending between said bodies, said A and B fluids being hot and cold water, there being tubular stems carrying said primary and secondary check valves, and back pressure drain ports in said tubular stems remote from said mixing zone, and in communication with said mixing zone, each said port being opened by sliding of its associated plunger.