The basic components of a control valve are:
The actuator generates thrust torque → adjusts valve core displacement → changes flow area → changes flow rate → also known as a regulating valve.
The role of control valves in the system:
Basic classification of control valves:
Valve body type:
Executing Agency:
Drive device for control valve:
According to energy supply, it can be divided into pneumatic, electric, and electro-hydraulic.
Pneumatic membrane actuator:
Pneumatic piston actuator:
Electric actuator:
Electric actuator: an actuator powered by electricity, with electric control and electromagnetic control. (See the electronic control valve related courseware published in the South Society Encyclopedia).
According to displacement, it can be divided into straight stroke, angular stroke, and multi turn.
It has the characteristics of fast action, fast response, convenient power supply, and long transmission distance.
Hydraulic (electro-hydraulic) actuator:
Hydraulic, electro-hydraulic or gas-liquid actuators: mainly used for matching devices and valves that require high thrust, high torque, fast response, safety and reliability.
Electro hydraulic actuators are widely used due to the need for electro-hydraulic execution.
enclosure:
Control valves can also be equipped with various accessories to achieve various control functions of the product itself;
The attachments can meet various special requirements of the control system for valves;
The purpose of the attachment is to make the function of the control valve more complete, reasonable, and perfect.