Overview of the advantages and disadvantages of th

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Overview of the advantages and disadvantages of various valves

block valves are mainly used to cut off 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

regulating valves are mainly used for biological packaging and degradable packaging of regulating media, with broad prospects for flow, pressure, etc. Including regulating valve, throttle valve, pressure reducing valve, etc

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

diverter valves are used to separate, distribute or mix media. Including distribution valves and traps of various structures

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

classification according to main parameters

(I) classification according to pressure

valves with working pressure lower than standard atmospheric pressure

low pressure valves with nominal pressure PN less than 1.6Mpa

medium pressure valves with nominal pressure of pn2.5~6.4mpa

high pressure valve with nominal pressure of pn10.0~80.0mpa

valves with nominal pressure PN greater than 100MPa

(II) classify according to the medium 1 and the room temperature within the range of 10~35 ℃

High temperature valve t is greater than 450C

medium temperature valve 120c is less than t is less than 450C

normal temperature valve -40c less than t less than 120c

low temperature valve -100c is less than t is less than -40c

ultra low temperature valve t is less than -100c

(III) according to the classification of valve body materials

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

metal 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

metal body lined valves: such as lead lined valves, plastic lined valves, enamel lined valves

general classification method

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, steam trap, regulating valve, bottom valve, filter, blowdown valve, etc. to consolidate the position in the industry

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