Valve actuator

Electric actuator (blue cylinder) on a valve in a power plant. A black handwheel is visible on the actuator, which allows manual positioning of the valve. The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position.

Gate Valve with Handwheel (L) and with Linear Pneumatic Actuator (R)

Electric multi-turn actuator with controls [2]

The positioner [1] is supplied with a setpoint [2] and an actual value [3]. The motor is controlled until the actual value is identical to the setpoint. The DCS generally needs a feedback signal [4]

A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve.

单词	Valve actuator
释义	Valve actuator 英语例句库 AUMA has been manufacturing valve actuators for 45 years and is a major supplier of electric GLOBE VALVE actuators and manual operators to industry. AUMA electric actuators are capable of operating all types of quarterturn valves (butterfly, ball and plug) and multiturn valves (gate,facebook 中文板, globe, sluice gate and pinch). 英语百科 Valve actuator A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve.
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