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Natural Gas Processing by Alireza Bahadori

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8.16. Control valve actuators

For the purpose of this section the following definitions apply:
Actuator:
Any device designed for attachment to a general purpose industrial valve in order to provide the operation of valve. The device is designed to operate by using motive energy which can be electrical, pneumatic, hydraulic, etc., or a combination of these. The movement is limited by travel, torque or thrust.
Multi-turn actuator:
An actuator that transmits to the valve a torque for at least one revolution and shall be capable to withstand the thrust.
Torque:
A turning moment transmitted through the mounting flanges and couplings.
Thrust:
An axial force transmitted through the mounting flanges and couplings. Control valve actuators should be selected, ...

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