Valve (valve) is a fluid delivery system in the control components, with cut-off, regulation, diversion, to prevent the reverse flow, voltage, shunt or overflow relief function.
Valves for fluid control systems, from the most simple cut-off valve to the very complex automatic control system used in a variety of valves, the variety and specifications are quite diverse. Valves can be used to control the flow of air, water, steam, a variety of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid. The valve according to the material is divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316), chrome molybdenum steel, chromium molybdenum vanadium steel valves, valve, dual phase steel valves, plastic valves, valves and other non-standard custom.