On the classification knowledge of valves

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Talking about the classification knowledge of valves

this classification method is divided by principle, function and structure. It is the most commonly used classification method at home and abroad at present. It is generally divided into gate valve, stop valve, throttle valve, instrument valve, plunger valve, diaphragm valve, plug valve, ball valve, butterfly valve, check valve, pressure reducing valve, safety valve, 29 ~ 82hr30t drain valve, regulating valve, bottom valve, filter, blowdown valve, etc. Classified by use and function,

regulating valves - mainly used to regulate the flow and pressure of media. Including regulating valve, throttle valve, pressure reducing valve, etc

check valves - used to prevent medium backflow. Including check valves of various structures

diverter valves - used for separating, distributing or mixing media. Including distribution valves and traps of various structures

safety valves - used for safety protection in case of medium overpressure. Including various types of safety valves

block valves - mainly used to block or connect the medium flow. Including gate valve, stop valve, diaphragm valve, ball valve, plug valve, butterfly valve, plunger valve, ball plug valve, needle instrument valve, etc

classified by pressure

vacuum valve - the valve whose working pressure is lower than the standard atmospheric pressure

low pressure valve - valve with nominal pressure PN less than 1.6Mpa

medium pressure valve - nominal pressure PN 2 4MPa valve

high pressure valve - nominal pressure pn10 0mpa valve

ultra high pressure valve - valve with nominal pressure PN greater than 100MPa

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classified by medium temperature, so as to ensure the levelness of instruments

high temperature valves - valves with t greater than 450 ℃

medium temperature valve - valve with 120 ℃ less than t less than 450 ℃

normal temperature valve - a valve whose temperature is less than 40 ℃ and t is less than 120 ℃

low temperature valve - valve with 100 ℃ less than t less than -40 ℃

ultra low temperature valve - valve with t less than -100 ℃

according to the description of the valve body, the force measuring piston should convert the material classification

metal valve body lining valve -: lead lined valve, plastic lined valve, enamel lined valve

non metallic valves such as ceramic valves, FRP valves, plastic valves

metallic valves such as copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves, cast iron valves, carbon steel valves, cast steel valves, low alloy steel valves, high alloy steel valves

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