Detecting Maintenance Statuses of Valves

A diagnostic system for a valve system for acquiring safety-relevant data about a valve which is operable or operated by a pneumatic actuator and which forms part of an industrial plant, the diagnostic system comprising:

• at least one of (i) a pressure detection unit for acquiring data on a pressure variation in the pneumatic actuator of the valve and (ii) an acoustic detection unit for detecting an acoustic variation in the valve system;
• a displacement sensor for detecting a position of the pneumatic actuator of the valve;
• an acoustic sensor for detecting structure-borne or airborne sound in the valve;
• an electrical connection to an electrical power supply network supplying the pilot valve to supply electrical power to at least one of (i) the pressure detection unit and (ii) the acoustic detection unit;
• and
• a measurement unit for identifying changes in the electrical power supply network for the pilot valve to identify a starting point of a closing action or of an opening action of the valve.