\nThe operation of control valves requires an actuator. The purpose of using an actuator is to change the position of the moving part of the valve in the desired position. The actuator converts the control signal of the system to the movement of the valve to open or closed state or the desired intermediate state.
\nExcitation of various types of controls can be done in different ways such as Pneumatic Actuators, Hydraulic Actuators, Electric Actuators and Manual Actuators.<\/p>\n
![\"Lockable](\"https:\/\/psa-equipment.com\/wp-content\/uploads\/2020\/08\/actuator\u062f\u0633\u062a\u06cc.jpg\")
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It is a mechanism for opening and closing the valve. Manual valves need at least one person to open or close them, which can be done by a direct mechanism or gearbox attached to the stem or handle of the valve.
\nAutomatic actuators allow the valve to be easily and quickly remotely controlled by air pressure (pneumatic), hydraulic pressure or electric force in large valves. Actuators may only be able to fully open or close the valve; but in some actuators it is possible to adjust the exact position of the valve.<\/p>\n
In most dairy companies, hygienic and process factories, actuators can be found on valves due to the implementation of automation. Actuators are an essential part of the process factory automation process.<\/p>\n
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Lockable handle (manual actuator)<\/strong> : However, in some large valves, it may not be possible to open and close the valve manually, or the valve may be in a hard-to-reach area or in a hazardous or toxic environment where manual actuators are not possible.<\/p>\n
\nManual actuators use a lever or hand wheel to move the disc. Manual actuators are driven by hand force. These actuators are usually inexpensive and easy to open and close.<\/p>\n