Valves are piping accessories used to open and close pipes, control flow direction, adjust and control the parameters (temperature, pressure, and flow) of the conveying medium.
According to its function, can be divided into shut-off valve, check valve, regulating valve and so on. Valves are control components in fluid conveying systems, with cutoff, regulation, diversion, prevention of countercurrent, voltage stabilization, shunt or overflow pressure relief and other functions.
Valves for fluid control systems, ranging from the simplest globe valves to the various valves used in extremely complex automatic control systems, are varied in variety and specifications. Valves can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metals and radioactive media. Valve According to the material is 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, duplex steel valves, plastic valves, non-standard custom-made valves and so on.