This classification method is the most commonly used classification method in the international and domestic, according to the principle, function and structure. General Valve, globe valve, throttle valve, instrument valve, plunger valve, diaphragm valve, plug valve, ball valve, butterfly valve, check valve, relief valve, trap, regulating valve, bottom valve, filter, sewage valve, etc.
Since the use of valves is extensive, it is also very important. For example: in power plants, valves can control the operation of boilers and steam turbines, and in oil and chemical production, valves are also in control of the normal operation of all production equipment and processes. The same is true in other sectors. Nonetheless, valves are often overlooked in comparison with other products. For example, when installing machine equipment, people tend to focus on the main machine and equipment, but ignore the valves. This will reduce or halt the entire production efficiency or cause other accidents. Therefore, the selection, installation and use of valves must be responsible for serious work.