Valves are pipeline accessories used to open and close pipelines, control flow direction, regulate and control the parameters of transport media (temperature, pressure and flow). According to its function, it can be divided into shut-off valve, check valve, control valve, etc.
Valve is the control part of the fluid conveying system. It has the functions of cut-off, regulation, diversion, countercurrent prevention, stabilization, diversion or overflow relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems.
Valves can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Valves are 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 valves and so on.