Preventing control-induced oscillations of the position of a valve member in a valve with pneumatic actuator

A method for preventing control-induced oscillations of a position of a valve member in a valve with pneumatic actuator and position control of the valve member,

• wherein the position control of the valve member has an integrating component;
• wherein the integrating component of the position control has a gain parameter and a dead zone;
• the method comprising the following steps:
• verifying the presence of oscillations of the position of the valve member;
• in the event that oscillations were detected:
• checking whether the detected oscillations result from oscillations of a set point of the position of the valve member;
• in case the oscillations do not result from oscillations of the set point of the position of the valve member, increasing the dead zone and/or decreasing the gain parameter;
• in the event that no oscillations were detected:
• checking whether wear in the pneumatic actuator of the valve member has exceeded a predetermined measure;
• if wear in the pneumatic actuator has exceeded the predetermined measure, decreasing the dead zone and/or increasing the gain parameter.