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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Different Types of Control Valve Actuators
Fail Open (Spring-to-Open, Air-to-Close) The actuator is spring-to-open, air-to-close type. Operation is via a normally closed 3 way, 2 position (3/2) solenoid valve. When the solenoid is energized, valve closes