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    Fluid Control Equipment

    Electro-Pneumatic Control Valves

    CT Series

    Direct and Reverse Actuation

    This term indicates the relationship between the air supplied to the actuator of a pneumatic control valve and the open/close direction of the main valve.

    Direct action

    Also called 'air to close' or 'fail open', direct acting actuators operates as follows: when air is supplied to the actuator, the increase in pneumatic pressure is applied to close the valve. When air supply is stopped, the valve opens by spring force.

    Reverse action

    Also called 'air to open' or 'fail close', reverse acting actuators operate in the opposite direction: when air is supplied to the actuator, the increase in pneumatic pressure lifts the valve stem and the valve opens. When air supply is stopped, the valve closes by spring force.

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