Abstract: A polished rod BOP ram seal is formed with protrusions that are disposable in corresponding seal retention pockets formed in a seal-receiving groove in a BOP ram receiving the seal. The resultant mechanical interlock between the ram seal and the ram provides increased resistance to extrusion of the seal from the ram under high-pressure, high-velocity fluid flow conditions through the BOP.

Abstract: A polished rod BOP ram seal is formed with protrusions that are disposable in corresponding seal retention pockets formed in a seal-receiving groove in a BOP ram receiving the seal. The resultant mechanical interlock between the ram seal and the ram provides increased resistance to extrusion of the seal from the ram under high-pressure, high-velocity fluid flow conditions through the BOP.

Abstract: An improved gate valve has a main body defining a flow passage, and a cylindrical gate member, which has a continuous seal disposed within a groove in the gate surface. The gate is actuated by a valve stem movable through a bonnet connected to the main body, with the longitudinal axis of the stem being offset from the longitudinal axis of the gate. The inner end of the stem is retainingly received in a recessed slot in the gate such that the valve stem can rotate relative to the gate and such that longitudinal movement of the stem will cause corresponding movement of the gate. The offset between the stem and gate axes keeps the gate in the same orientation relative to the gate chamber regardless of the gate's longitudinal position.