The valves are controlled fluid delivery system components, with the cut-off, regulation, diversion, to prevent reflux, regulation, diversion or overflow relief functions. Valves for fluid control systems, from the most simple shut-off valve to a variety of highly complex automatic control valves used in the system, which is quite a range of varieties and specifications. The valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. Valve is also divided into cast iron valves, cast steel valves, stainless steel valves (201,304,316, etc.), chromium-molybdenum steel valve, chromium molybdenum vanadium steel valves, dual-phase steel valves, plastic valves, and other non-standard custom valve material according to the material .
