Patent ID: 6868772

Claim:
A valve for controlling fluid flow to a fluid operated device, said valve comprising: a valve body having first and second passageways formed therethrough and facilitating fluid flow in a first direction and a second opposite direction; a check element positioned longitudinally in said first passageway, said check element having first and second ends, said check element being movable between a first closed position to block flow of fluid through said first passageway and said check element being movable to a second open position when fluid flows through said first passageway in the second opposite direction and around said check element from said first end beyond said second end thereof; a piston member having first and second ends and mounted transversely in said second passageway, said piston being movable between a retracted position when fluid flows through said second passageway in said second opposite direction and in contact and around said piston member, and an extended position when fluid flows in said first direction through said second passageway and wherein said second end of said piston member extends into said first passageway and contacts said check element to maintain said check element in the second open position, a piston receiver mounted in said valve body adjacent said second passageway and transversely disposed in said second passageway, said piston receiver for receiving said first end of said piston element, said piston receiver facilitates slidable movement of said piston element between said retracted and extended positions, and said piston receiver delimits said retracted position of said piston member.