Valve is used to open and close the pipeline, control the flow direction, adjust and control the transfer medium parameters (temperature, pressure and flow) of the pipeline accessories. According to its functions, it can be divided into shut-off valve, check valve, regulating valve and so on.

Valve is the control part of the fluid conveying system. It has functions such as cut-off, regulation, diversion, prevention of countercurrent, steady pressure, diversion or overflow pressure relief. Valves used for fluid control systems, ranging from the simplest cut-off valves to the most complex automatic control systems, have a wide range of valves and specifications.

Valves can be used to control the flow of various types of fluids such as air, water, steam, corrosive media, mud, oil, liquid metal and radioactive medium. The valve is also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non standard customized valves and so on.