GATE VALVE

摘要

The present invention is directed to a gate valve (10) which in one embodiment comprises a valve body (12) having an internal flow passage (14) which extends between an inlet port (16) and an outlet port (18); a pair of seats (104) mounted in respective seat pockets (106) formed in the body coaxial with the flow passage; a gate (94) disposed between the seats and having a transverse opening (100) therethrough; and a valve stem (68) threadedly connected to the gate; wherein rotation of the valve stem raises or lowers the gate to bring the opening into or out of alignment with the flow passage to either open or close the gate valve, respectively; and wherein each seat comprises a generally cylindrical body portion having a substantially uniform outer diameter and first and second end faces which are adapted to seal with the gate; whereby each seat may be mounted in its seat pocket with either the first face or the second face adjacent the gate.