The valve is a control component in the pipeline fluid conveying system, which is used to change the passage section and the flow direction of the medium, and has the functions of guiding, blocking, throttling, check valve, diverting or overflow pressure relief.
The valves used in fluid control range from simple globe valves to various valves used in extremely complex automatic control systems. There are many varieties and specifications. The nominal diameter of valves ranges from extremely small instrument valves to industrial pipelines with a diameter of 10m. valve. It can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metals, radioactive fluids, etc. The working pressure of the valve can be from 0.0013MPa to ultra-high pressure of 1000MPa, and the working temperature can be from the ultra-low temperature of minus 270 to the high temperature of 1430.
The valve control can adopt various transmission modes such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic-hydraulic, electro-hydraulic, gas-hydraulic, spur gear, and bevel gear drive. According to pressure, temperature and other forms of sensing signals, it can act according to the specified requirements, or it can simply open and close without relying on the sensing signal. The valve realizes its control function by driving or robot to make the opening and closing tool lift, slide, rotate or rotate, and change the size of its flow path area.
