Patent ID: 8177188

Claim:
A valve assembly, comprising: a valve body having a bore including an upper end, a lower end and an intermediate annular valve seat, and the valve body includes a first portion and a second portion attached to the first portion, wherein the first portion includes the first port and the second portion includes the second port, and the first portion includes one of an externally threaded portion and an internally threaded portion and the second portions includes the other of the externally threaded portion and the internally threaded portion and the internally threaded portion engages the externally threaded portion to define the valve body; a first port fluidly connected at one end of the bore and a second port connected at the other end of the bore; a valve member slidably carried by a cover member sealing the bore and moveable between a closed position engaging the valve seat and blocking fluid flow through the second port and an open position permitting fluid flow through the second port, wherein a longitudinal axis of the valve member is coaxial with the first port and the second port; a piston member slidably carried in the bore for moving the valve member to the closed position under pressurized conditions; and a control for selectively applying pressurized conditions to the piston member for effecting the closed position and reversely conditioned for removing the pressurized conditions and permit movement of the valve member to the open position by pressure conditions in the lower end of the bore, thereby providing two way valve functionality.