KLEPBESCHERMINGSMECHANISME.

摘要

A protective mechanism is provided for valves having a nut through which a power-driven valve stem is threaded. The mechanism functions to protect the valve seat against the continuation of thrust of the valve-stem closure element against the valve seat after the valve has been fully closed. The continuation of thrust force, unless prevented, occurs due to inertia of the drive motor after torque-sensing or other means have shut off the power to the motor. The protective mechanism includes energy-absorbing means for absorbing the kinetic energy of the over-running drive motor and for stopping further rotation of the valve stem.