| 摘要 |
A gate valve is disclosed which comprises a valve body having an internal flow passage which extends between an inlet port and an outlet port, a pair of seats mounted in respective seat pockets formed in the body coaxial with the flow passage, a gate disposed between the seats and having a transverse opening therethrough, and a valve stem 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. Each seat comprises a generally cylindrical body portion having a substantially uniform outer diameter surface and first and second end faces which are adapted to seal with the gate. In this manner, each seat may be mounted in its seat pocket with either the first end face or the second end face adjacent the gate. Furthermore, each seat also comprises first and second annular grooves formed on the outer diameter surface between the first and second end faces; however, only one of the grooves is positioned within the seat pocket when the seat is mounted in the seat pocket.
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