Patent ID: 8262060

Claim:
An actuating device for an on/off valve, comprising: a solenoid valve having a connection for a compressed air supply; a pneumatic drive connected to the solenoid valve, the solenoid valve is operable in a first operating state configured for ventilating the pneumatic drive with the compressed air supply when driven with a control voltage and is operable in a second state configured for venting the pneumatic drive when the control voltage is not present, and the pneumatic drive moving the on/off valve into an operating position during the ventilating and moving the on/off valve into a safety position during the venting; and means for performing a partial stroke test including: a controllable switch that is closeable in a quiescent state and supplies the control voltage to the solenoid valve, the controllable switch being openable by a control signal generated to perform the partial stroke test; and a position switch configured to supply the control signal to the controllable switch, the position switch being closed in the operating position of the valve and being opened when the valve reaches a predefined position in the direction of the safety position.