Servo drive for safety and regulating valves

Details Servo drive for safety and regulating valves Servo drive for safety and regulating valves

1991-09-09

1992-10-06

Michalsky, Gerald A.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

25112911, 2512495, F16K 3104, F16K 3150

Patent

active

051523167

ABSTRACT:
Safety and regulating valves of safety stations meter energy flows in the form of gases, steam or water, in particular in thermal or industrial power plants. In a servo drive for the valves, a drive force for a safety movement of a restrictor body is derived from a working-medium pressure difference acting on the restrictor body. To this end, the spindle drive of the safety valve is constructed in such a way as to be non-self-locking. A rapid-travel mechanism is used instead of a rapid-travel motor. The rapid-travel mechanism is coupled through a non-self-locking gear unit to a planetary gear stage of the servo drive and has a shaft being normally securely braked by a releasable brake device. When the response pressure occurs, the brake device releases the rapid-travel mechanism to perform the safety movement of the restrictor body into its required position by means of the inherent medium. In a positive direction of action, the required position is the open position of the restrictor body, and in a negative direction of action the required position is the closed position.

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