Valve products of a wide range of claims are not completely unified, and some by the use of points (such as chemical, petroleum, power plants, etc.), and some by media (such as water vapor, air valve, etc.), and some according to the material , Cast steel valves, forged steel valves, etc.), and some according to the connection form (such as the internal thread, flange valves, etc.), and some according to the temperature points (such as cryogenic valves, high temperature valves, etc.). At present, most of our habits are differentiated according to the type of pressure and structure. Namely: According to the nominal pressure points: ≤ 1.6MPa for the low-pressure valve, pressure 2.5,4.0,6.4 MPa for the pressure valve, ≥ 10MPa for the high pressure valve, more than 100MPa for the high pressure valve. According to the type of structure points are: plug, gate valve, globe valve, ball valve - used to open or close the pipeline of medium flow. Check valve (including the bottom valve) - Used to automatically prevent the media back in the pipeline. Throttle - Used to regulate the flow of the pipe media. Butterfly valve - used to open or close the pipeline of media. Can also be used for adjustment. Safety valve - used in boilers, container equipment and pipelines, when the media pressure 趔 over a specified value, the pressure can be automatically ruled out of excess media to ensure safe operation of production. Pressure Reducing Valve - Used to automatically reduce medium pressure in pipes and equipment. Department of the media through the valve clearance, resulting in resistance caused by pressure loss, to achieve the purpose of decompression. Traps - Used to automatically drain condensate from steam lines to prevent loss or leakage of steam. The first classification by purpose and function 1. Shut-off valve: mainly used to cut off or connect the media flow. (Such as butterfly valve, ball valve, gate valve, globe valve, diaphragm valve, plug valve, etc.) 2. Regulating valves: mainly used for regulating the flow of media, pressure and so on. (Such as regulating valve, throttle, pressure reducing valve, etc.) 3. Check valves: mainly used to prevent the media to the flow. 4. Diverter valves: Used to distribute, separate or mix media. (Such as various distribution valves and traps, etc.) 5. Safety valves: for overpressure safety, including various types of safety valves. The second category according to the main parameters by pressure classification 1. Vacuum valve: the working pressure is lower than the standard atmospheric pressure valve. 2. Low pressure valve: Nominal pressure PN ≤ 1.6Mpa valve. 3. Medium pressure valve: Nominal pressure PN2.5 ~ 6.4Mpa valve. 4. High pressure valve: Nominal pressure PN10.0 ~ 100Mpa valve. 5. Ultra-high pressure valve: Nominal pressure PN ≥ 100Mpa valve. According to the medium temperature classification 1. High temperature valve: t> 450 ℃ valve. 2. Temperature valve: 120 ℃ ≤ t ≤ 450 ℃ valve. 3. Room temperature valve: -40 ℃ ≤ t ≤ 120 ℃ valve. 4. Cryogenic valve: -100 ℃ ≤ t ≤ -40 ℃ valve. 5. Cryogenic valve: t <-100 ℃ valve. Classified by material 1. Non-metallic valves: such as ceramic valves, plastic valves. 2. Valves of metal materials: such as cast iron valves, cast steel valves and all kinds of alloy valves. 3. Metal body lining valves: such as lining aluminum, lining plastic valves. The third general taxonomy This taxonomy not only by principle, role and structure by the division, is currently the most common non-class methods at home and abroad. Generally divided into: gate valve, globe valve, plug valve, ball valve, butterfly valve, diaphragm valve, check valve, throttle, safety valve, pressure reducing valve, steam trap, regulating valve.
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