What is a valve?

The valve is a pipeline accessory used to open and close the pipeline, control the flow direction, adjust and control the parameters (temperature, pressure and flow) of the transmission medium. According to its function, it can be divided into shutoff valve, check valve, regulating valve, etc.
The valve is a control component in the fluid transmission system, which has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. The valves used in the fluid control system, from the simplest stop valve to the most complex automatic control system, have a wide variety of types and specifications.
The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal, radioactive media and other types of fluids. Valves are also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, dual-phase steel valves, plastic valves, non-standard customized valves, etc.
The valve is a device used to control the direction, pressure and flow of the fluid in the fluid system. It is a device to make the medium (liquid, gas, powder) in the piping and equipment flow or stop and control its flow.
The valve is the control part in the pipeline fluid transmission system, which is used to change the channel section and the medium flow direction, and has the functions of diversion, cut-off, throttling, check, diversion or overflow relief. The valves used for fluid control range from the simplest stop valve to various valves used in the extremely complex automatic control system, with a wide variety of varieties and specifications. The nominal diameter of the valves ranges from extremely small instrument valves to industrial pipeline valves with a diameter of up to 10m. It can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can range from 0.0013MPa to 1000MPa, and the working temperature can range from c-270 ℃ to 1430 ℃.
The valve can be controlled by a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electro-hydraulic, electro-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc; Under the action of pressure, temperature or other forms of sensing signals, it can act according to the predetermined requirements, or it can simply open or close without relying on the sensing signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts move up and down, slide, swing or swing, thus changing the size of its flow channel area to achieve its control function.