DOUBLE ANNULAR ROD SHOULDER SEAL AND INDEPENDENT DOUBLE VALVE ROD SEAL

摘要

A double annular rod shoulder seal consists of a sealing ring (07), a pressing ring (08) and a spherical or tapered rod shoulder (06). The material of the sealing ring is designed upon limit load of strength, and makes the sealing ring work on the state of self sealing free of limit load of strength. An independent double valve rod seal consists of double annular rod shoulder seal, a triangular section ring (09) rod seal and an isolate cooperate pack. The valve rod seal make the isolation cooperation, rod shoulder seal and rod seal simultaneously automatically operate and independently bear limit medium pressure when the torque pressed on the valve rod markedly increases. The valve rod seal double ensures the valve rod seal independently.