It belongs to the control valve.Compared with the detection elements, transmitters and controllers, the control valve needs to constantly change the circulating area of the throttle valve in order to adapt to the changes of load or working conditions, so as to change the control variables.Therefore, higher requirements are put forward for the sealing, pressure resistance and corrosion of the control valve assembly.For example, the seal will increase the friction of the control valve and the dead zone of the control valve, resulting in poor control quality of the control system.
2、 The control valve has strong adaptability.It is installed in a variety of different production processes, in the production process of high temperature, low temperature, high pressure, large flow, small flow and other working conditions need to adjust the valve, with a variety of different functions, can meet the requirements of different purposes of the control valve.
3. The throttle of the control valve makes the valve consume energy.Therefore, it is necessary to choose and consider the reasonable choice between reducing energy consumption, reducing pressure loss of control valve and ensuring better control quality.The contact medium of the control valve material may be different from that of the test element, so higher requirements are put forward for the corrosion resistance, strength and stiffness of the control valve.
4. The regulating valve will also produce noise when throttling. For example, when the outlet pressure of the control valve is lower than the steam pressure of the liquid, it will produce flash; when the pressure downstream of the control valve is higher than the steam pressure of the liquid, cavitation will occur.The noise produced by the control valve is related to the design of the flow channel, the working pressure and the characteristics of the controlled medium.Therefore, higher requirements are put forward for the control valve in reducing noise and pressure loss.