Regulating valves can be divided into three types: pneumatic, electric and hydraulic. They are pneumatic regulating valves with compressed air as power source, electric regulating valves with electricity as power source, and electro-hydraulic regulating valves with pressure of liquid medium (such as oil) as power. In addition, according to their functions and characteristics, regulating valves also have solenoid valves, electronic, intelligent and current. Fieldbus type control valves, etc. There are many types of control valves and their structures are varied, and they are constantly updated and changed.

There are many kinds of control valve body, commonly used are through single seat, through two seats, angle, diaphragm, small flow, three-way, eccentric rotation, butterfly, sleeve, spherical and other 10 kinds. Before choosing the valve, it is necessary to carefully analyze the medium, process conditions and parameters of the control process, collect enough data, understand the requirements of the system for the control valve, and determine the type of valve to be used according to the collected data.