(1) Block type: such as gate valve, stop valve, plug valve, ball valve, butterfly valve, needle valve, diaphragm valve, etc. Block valves, also known as closed-circuit valves and stop valves, are used to connect or cut off the medium in the pipeline.
(2) Check type: such as check valve, which is also known as one-way valve or check valve. The check valve is an automatic valve. Its function is to prevent the backflow of medium in the pipeline, the reverse rotation of pump and driving motor, and the leakage of container medium. The bottom valve of water pump suction closing also belongs to check valve.
(3) Safety class: such as safety valve, explosion-proof valve, emergency valve, etc. The function of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.
(4) Regulation: such as regulating valve, throttle valve and pressure reducing valve, which is used to regulate the pressure, flow and other parameters of the medium.
(5) Shunt type: such as distribution valve, three-way valve and drain valve. Its function is to distribute, separate or mix the medium in the pipeline.
(6) Special purpose: such as pigging valve, vent valve, blowdown valve, exhaust valve, filter, etc. Exhaust valve is an essential auxiliary component in pipeline system, which is widely used in boiler, air conditioning, oil and gas, water supply and drainage pipeline. It is often installed at the commanding point or elbow to eliminate excess gas in the pipeline, improve the use efficiency of pipeline roads and reduce energy consumption.
