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Control Valve Positioners

S Bharadwaj Reddy
The reason why a pneumatic control valve’s stem position corresponds linearly to the amount of air pressure applied to the actuator is because mechanical springs tend to follow Hooke’s Law,...

Functional Testing of Control Valve Positioners

S Bharadwaj Reddy
Valves, the actuators that move them, and the electronic circuits that control them, are all subject to aging soon after they are installed. Valve seats wear from repeated seatings and...

Pneumatic Valve Positioner Working Principle

S Bharadwaj Reddy
The Pneumatic Valve Positioner is an instrument working on force balance principle to position the Control Valve stem in accordance to a pneumatic signal received from a controller or manual...

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