Patent ID: 6978799

Claim:
An improved pressure relief valve having a housing with a relief passage, a valve seat therein, and a pressure chamber, a movable valve member in the housing that is movable from a closed position to an open position in response to a system pressure increase, a movable pressure barrier carried in the pressure chamber and operably connected to the valve member, wherein the improvement comprises: a stationary fluid injector stab extending through a side of the pressure chamber and sealingly engaging a central bore of the movable valve member for delivering pressurized fluid; a stab port extending through a sidewall of the injector stab for flowing the fluid into the pressure chamber on a first side of the pressure barrier; and a valve member port extending through a side of the valve member, the valve member port being in fluid communication with the stab port when the valve member is in its open position so that the pressurized fluid flows into the pressure chamber on a second side of the pressure barrier, the valve member port being sealed from the stab port when the valve member is in its closed position and venting while the valve member is approaching its closed position for the fluid on the second side of the pressure barrier to exit the chamber.