Patent ID: 8096316

Claim:
A valve system for use in a system comprising a first source of a first pressurized fluid and a second source of a second pressurized fluid, the valve system comprising: a valve housing comprising a first inlet port adapted to be placed in fluid connection with the first source, a second inlet port adapted to be placed in fluid connection with the second source and an outlet port; a backflow prevention system to prevent flow of the first pressurized fluid through the second inlet and to prevent flow of the second pressurized fluid through the first inlet port, the backflow prevention system comprising a first check valve in fluid connection with the first inlet port and a second check valve in fluid connection with the second inlet port; and a bypass flow path to direct flow around the first check valve, thereby providing a fluid path between the outlet port and the first inlet port to enable fluid to be drawn from the outlet port to the first inlet port.