Talk about the importance of regulating valve

1. The regulating valve is a throttling device, which is a moving part. Compared with the detection element, the transmitter and the controller, in the control process, the regulating valve needs to continuously change the flow area of the throttling part to change the manipulated variable to adapt to the load. changes or changes in operating conditions. Therefore, higher requirements are placed on the sealing, pressure resistance, corrosion, etc. of the valve components of the regulating valve. For example, sealing will increase the friction of the control valve, increase the dead zone of the control valve, and cause the control quality of the control system to deteriorate.

2. The adaptability of the regulating valve is strong. It is installed in various production processes. The high temperature, low temperature, high pressure, large flow, small flow and other operating conditions of the production process require the control valve to have various functions, and the control valve can adapt to the requirements of different applications.

3. The throttling of the regulating valve causes the energy to be consumed inside the valve. Therefore, a reasonable choice and consideration must be made between reducing energy consumption, reducing the pressure loss of the regulating valve, and ensuring better control quality. The contact medium of the control valve material may be different from the contact medium of the detection element, so higher requirements are placed on the corrosion resistance, strength and stiffness of the control valve.

4. When the regulating valve throttles the fluid, it also causes noise. For example, when the outlet pressure of the regulating valve is lower than the vapor pressure of the liquid, it will cause flash evaporation; when the pressure downstream of the regulating valve is higher than the vapor pressure of the liquid, it will cause cavitation. The noise caused by the control valve is related to the design of the flow path of the control valve, the operating pressure, and the characteristics of the controlled medium. Therefore, reducing noise, reducing pressure loss, etc. put forward higher requirements for regulating valves.