1。 The classification of the valve USES ( 1) Cut-off valve, such as gate valve, globe valve, plug valve, ball valve, butterfly valve, needle valve, diaphragm valve, etc. Cut-off valve, also known as closed-circuit valve, cut-off valve, its function is to open or cut off the medium in pipeline. ( 2) Check valve, such as check valve, check valve, Also known as one-way valve or reverse valve) , the check valve belong to automatic valve, its function is to prevent the reverse flow of the media in the pipeline, to prevent the pump and drive motor reversal, the leak container medium. Pump suction closed valve also belongs to the check valve at the bottom of the class. ( 3) Security category, such as relief valve, explosion-proof valve, the valve of accidents, and etc. The role of safety valve is to prevent the medium pressure in the pipe or equipment more than a specified value, in order to achieve the purpose of security and protection. ( 4) Adjust the categories, such as control valves, throttle valve, relief valve, etc. , its function is to regulate parameters such as pressure, flow rate of the medium. ( 5) Shunt type, such as distributing valve, three-way valve, drain valve etc. Its function is to distribute, separation or mixed media in pipeline. ( 6) Categories: special purposes such as pipeline cleaning valve, drain valve, exhaust valve, filter, etc. Exhaust valve in the pipe system is indispensable accessories, are widely used in boiler, air conditioning, oil and gas, water supply and drainage pipeline. It is usually installed on high ground or bend to eliminate excess gas in the pipeline, raise the use efficiency of pipe road, reduce energy consumption. 2. According to the classification of nominal pressure ( 1) Vacuum valve, working pressure is lower than the standard atmospheric pressure of the valve. ( 2) Low pressure valve: index according to the PN 1 or less pressure. 6 mpa valve. ( 3) Medium pressure valve: index according to pressure the Pn to 2. 5, 4. 0, 6. 4 mpa valve. ( 4) High pressure valve: refers to the pressure of 10 ~ 80 mpa. ( 5) Ultrahigh pressure valve: index said PN 100 Mpa valve or pressure.

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