Method for testing the functionality of an actuator, especially of an actuator of a safety valve

Abstract

In a method for testing the functionality of an actuator in an actuating system, especially for the actuator of a valve (2) in a safety-oriented circuit in which the partial stroke test method is used, where the actuator is moved briefly by its drive element (8) such as a valve rod over a portion of its actuating path to test its functionality, the goal is to prevent the actuating system from closing too far during the performance of the partial stroke test method. This is accomplished in that, to prevent the actuating system from closing too far, the drive element (8) with the actuator is driven in such a way that it can be moved only within permitted limits during the partial stroke test. The actuating path of the actuator (7, 8) is limited by a mechanical stop (15). The pressure in the drive of the actuator (8) can also be increased continuously until the friction of the system is overcome, where a conclusion concerning the status of the actuating system can be drawn on the basis of the pressure value at which the actuator (8) starts to move.

Dependencies are inferred from the claim text.