| 摘要 |
~ IMPROVED GATE VALVE An improved gate valve for effective sealing regardless of the pressure of the fluid in the conduit to which the valve is attached. The gate valve comprises a body (20) having opposing upstream and downstream sides (46, 44). Each side has a conduitjoining surface (72, 73) formed thereon. The body is configured for connection between two axially aligned conduits (24, 25) with each conduit-joining surface abutted against the end of an associated conduit. A resilient liner (27) is attached to the body between the valve gate (32) and the body (20). The liner also covers the portion of the body that defines the port. The liner includes a sealing surface (60) formed thereon. The sealing surface is configured for sealing contact with the portion of the edge surface of the gate that resides within the body when the gate is in the closed position. The gate valve also includes at least one seal ring (62) positioned against the body at the periphery of the port on one side of the gate. The seal member has a gate-engaging part (64) located adjacent the gate. The gateengaging part has a face formed thereon for sealing contact with the downstream surface of the gate when the gate is in the closed position. |
