The different kinds of valves .

(1) Cut off kinds: such as gate valves, globe valves, plug valves, ball valves, butterfly valves, needle valves, diaphragm valves, etc. Truncated type valve, also known as closed-valve, globe valve, and its role is to connect or disconnect the line of media. Check valve, check valve leakage, also known as one-way valve or check valve, the check valve is a kind of automatic valves, its role is to prevent the line of medium back, to prevent reverse pump and drive motor, and a container medium . Pump water off the end of the valve also belongs to check class. Explosion-proof valves, valves and other accidents, the safety valve is to prevent the pipeline or device medium pressure exceeds a predetermined value, so as to achieve security purposes. Regulating valves, throttle valves and pressure reducing valve, whose role is to regulate media pressure, flow and other parameters. (2) Vacuum kinds: such as vacuum valve, vacuum flapper valve, filling the vacuum valve, pneumatic vacuum valve. Its role is in the vacuum system, to change the direction of air flow, adjust the size of the gas flow, or turn off the vacuum system components pipeline called vacuum valves. (3) Special purpose kinds: such as pigging valve, vent valve, drain valve, exhaust valves, filters and the like. Exhaust valve is an essential auxiliary piping system components, widely used in boilers, air conditioning, oil and gas, water supply and drainage canal. Often installed in the commanding heights or elbow, etc., exclude excess gas pipeline, improve the efficiency of management of road use and reduce energy consumption.