Valves are pipeline accessories used to open and close pipelines, control flow direction, regulate and control the parameters of the conveying medium (temperature, pressure, and flow).

According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc.

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.

Valves can be divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, duplex steel valves, plastic valves, non-standard customized valves, etc. according to their materials.