PID Controller Action : Directing Acting & Reverse Acting
Air to open/close valves and direction of control action Control valves come in two sorts: air to open; and air to close. Air to open valves are normally held closed by the...
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Direct Acting Control Valves & Reverse Acting Control Valves
Actuators may be categorized as ‘direct acting’ or ‘reverse acting’ and some configurations are indicated in Below Figure. In a reverse acting actuator an increase in the pneumatic pressure applied to the diaphragm lifts the valve stem (in...