pneumatic control valve is a widely used actuator in industrial automation control systems, mainly used to control the flow, pressure, temperature and other parameters of fluids (such as gases, liquids, etc.), the following is its relevant information:

working principle

using compressed air as the power source, the pressure energy of the compressed air is converted into mechanical energy through the pneumatic actuator, so as to drive the spool action of the control valve. When the controller sends out a control signal, the signal will be transmitted to the positioner of the pneumatic control valve, which accurately controls the air volume and pressure of the compressed air entering the actuator according to the size of the received signal, and then pushes the valve core to produce corresponding displacement, change the flow area between the valve core and the valve seat, and realize the adjustment of fluid flow and other parameters.

structural composition

actuator: It is the power part of the pneumatic control valve, and there are two common types: membrane type and piston type. The membrane actuator has a simple structure and reliable action, and is suitable for general adjustment occasions. The piston actuator has a large output force and is suitable for high pressure, large diameter and other occasions that require large thrust.

Valve body part: including valve body, valve core, valve seat, etc. The valve body is the outer shell of the control valve, which plays the role of connecting pipes and accommodating internal parts; The valve spool is a key component of the control valve, and its shape and structure determine the flow characteristics and regulation performance of the control valve. The valve seat is matched with the valve core to control the on/off and flow rate of the fluid.