Patent ID: 8443825

Claim:
A valve system for connecting a downstream fluid treatment device to a single line faucet comprising: a housing; a first inlet port on said housing for receiving supply fluid into the valve system; a first outlet port on said housing in fluid communication with said first inlet port, said first outlet port for transmitting fluid out of the valve system to the downstream device; a second inlet port on said housing for receiving fluid into the valve system from the downstream device; a second outlet port on said housing for transmitting fluid out of the valve system to the single-line faucet; and an automatic shutoff valve in said housing in fluid communication with said first inlet port, said first outlet port, said second inlet port, and said second outlet port, wherein said shutoff valve is automatically switched from an open position to a closed position and from said closed position to said open position as a function of a pressure differential between the first inlet port and the second outlet port, said open position allowing fluid flow through said first inlet port to said first outlet port, and through said second inlet port to said second outlet port, said closed position prohibiting fluid flow from said first inlet port to said second outlet port, the valve system including a switch that prohibits said shutoff valve from placement in said open position.