Patent ID: 8353353

Claim:
A valve assembly comprising: a housing; a primary valve movable between an open position and a closed position, wherein the primary valve is biased toward the closed position; a secondary valve movable between an open position and a closed position, wherein the secondary valve is biased toward the closed position; a flow tube slidably disposed in the housing, wherein the flow tube is movable between a first position in which the flow tube retains the primary valve in the open position, and a second position, wherein the flow tube is biased toward the second position; a sleeve slidably disposed in the housing and independently movable relative to the flow tube, wherein the sleeve is movable between a first position in which the sleeve retains the secondary valve in the open position, and a second position; a fluid chamber in fluid communication with the flow tube, wherein fluid in the fluid chamber prevents movement of the flow tube toward the second position; and a mechanical member, an electrically actuated member, a hydraulically actuated member, or combinations thereof, configured to release fluid from the fluid chamber, thereby permitting movement of the flow tube toward the second position.