According to the different functions of opening and closing valves, there are many classification methods of valves. Here are the following.
Classification by function and use
(1) Block valve: block valve, also known as closed-circuit valve, is used to connect or cut off the medium in the pipeline. Block valves include gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragms.
(2) Check valve: check valve, also known as one-way valve or check valve, is used to prevent the backflow of medium in the pipeline. The bottom valve of water pump suction closing also belongs to check valve.
(3) Safety valve: the function of safety valve is to prevent the medium pressure in pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.
(4) Regulating valve: regulating valve includes regulating valve, throttle valve and pressure reducing valve, which is used to regulate the pressure, flow and other parameters of medium.
(5) Diverter valve: diverter valves include various distribution valves and traps, which are used to distribute, separate or mix the media in the pipeline.