The duty of the hydraulic actuator, actuator or actuator (in English: Actuator), which is a type of motor in control valves, is to provide the necessary force to open and close the valve and to place it in the desired position according to the signal sent by the controller. Actuators are available in different types of pneumatic, electric or self-acting and are selected and used according to the state of the system. In this type of actuators, the necessary force to move the valve is provided through compressed air, which is applied to the top or bottom of the flexible diaphragm in the actuator housing. Figure 1 shows the pneumatic actuator model PN1000 along with the C series control valve of Spirax Sarco factory. The air pressure applied to the diaphragm causes force to be applied to the valve stem, the amount of which depends on the level of the diaphragm. The opposite force of the spring is to return the valve to its initial position if the air pressure signal decreases or to close the valve completely if the air pressure is cut off. The air pressure is adjusted by the positioner and the controller. The plug part of the valve is connected to the stem on one side and to the diaphragm on the other side, and as a result, the movement of the diaphragm will cause the valve to move.
Company | هیدرولیک،پنوماتیک و برق صنعتی سالار |
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