The regulating valve, also known as the control valve, is the main type of actuator. By accepting the control signal output from the regulating control unit, the fluid flow is changed by the power operation.
The regulating valve is generally composed of an actuator and a valve. If the power is used according to the actuators it is equipped with, the regulating valve can be divided into three types: pneumatic, electric and hydraulic. The pneumatic regulating valve with compressed air as the power source and the electric regulating valve with electric power as the liquid medium (such as oil, etc.) The pressure-powered electro-hydraulic control valve, in addition to its function and characteristics, there are solenoid valves, electronic, intelligent, fieldbus-type regulating valves. The type of control valve is very
The structure is also diverse and constantly updated and changed. Valves are generally versatile and can be matched to pneumatic actuators or to electric actuators or other actuators.
Control valve type selection
Valve body type selection of the valve The choice of valve body is the most important part of the valve selection.
There are many types of regulating valve bodies. Commonly used are 10 types of straight through single seat, straight through double seat, angle, diaphragm, small flow, three-way, eccentric rotation, butterfly, sleeve and spherical. Before selecting the valve, carefully analyze the media, process conditions and parameters of the control process, collect sufficient data, understand the requirements of the system for the regulating valve, and determine the type of valve to be used based on the collected data. In the specific choice, you can consider the following aspects:
(1) The shape of the spool is mainly based on factors such as the selected flow characteristics and unbalanced forces.
(2) Abrasion resistance When the fluid medium is a suspension containing a high concentration of abrasive particles, the valve core and the valve seat joint face are severely rubbed each time they are closed. Therefore, the flow path of the valve should be smooth and the internal material of the valve should be hard.
(3) Corrosion resistance Because the medium is corrosive, in the case of meeting the adjustment function, try to choose a simple valve.
(4) Temperature and pressure of the medium When the temperature and pressure of the medium are high and the change is large, the valve and the material of the valve seat should be selected to be small in temperature and pressure.
(5) Prevention of flashing and cavitation Flashing and cavitation are only produced in liquid media. In the actual production process, flashing and cavitation not only affect the calculation of the flow coefficient, but also generate vibration and noise, so that the service life of the valve is shortened, so the valve should be prevented from flashing and cavitation when selecting the valve.
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