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Types of valves A valve is a general mechanical product that controls the flow of media in a pipeline by changing its internal passage cross-sectional area. Divided by function: 1. Cut-off (or closed-circuit) valves: Connect or cut off the medium in the pipeline, including gate valves, globe valves, plug valves, diaphragm valves, ball valves and butterfly valves, etc. 2. Check (or one-way, check) valves: Prevent the backflow of media in the pipeline, including check valves and foot valves. 3. Regulating valves: Adjust cut-off flow, pressure and other parameters in the pipeline, including throttle valves, pressure reducing valves and various regulating valves ； 4. Diverter valves: Distribute, separate or mix media in pipelines, including plug valves, ball valves and traps, etc. 5.Safety valves: Prevent the medium pressure from exceeding the specified value and provide overload protection for pipelines or equipment, including various forms of safety valves and safety valves. By use department: 1.Universal valve: Widely used in various industrial sectors. 2.Power station valve: Applied to thermal, hydraulic and nuclear power plants (stations). 3.Marine valve: Applied to ships and ships. 4. Metallurgical valves: Used in iron-making, steel-making and other metallurgical sectors. Pipelines are used in oil and gas pipelines. 5. Plumbing valves: Use water supply, drainage and heating equipment. According to nominal pressure: 1. Vacuum valve: Working pressure is expressed in terms of vacuum. 2. Low pressure valve: Nominal pressure PN≤1.6Mpa. 3. Medium pressure valve: 1.6Mpa