Types of valves and their applications

Types of valves and their application: 1. Classification by purpose and function: 1. The cut-off valve is mainly used to cut off or turn on the medium flow. Including gate valve, globe valve, diaphragm valve, ball valve, plug valve, disc valve, plunger valve, ball valve, needle type instrument valve. 2. Regulating valves are mainly used to regulate the flow and pressure of the medium. Including regulating valves, throttle valves, pressure reducing valves, etc. 3. Check valves are used to prevent the media from flowing backwards. Includes check valves in a variety of configurations. 4. Diverter valves are used to separate, distribute or mix media. It includes distribution valves and traps of various structures. 5. Safety valves are used for safety protection when the medium is overpressured. Includes various types of safety valves. Second, according to the main parameters classification (A) according to the pressure classification vacuum valve working pressure is lower than the standard atmospheric pressure of the valve. Low pressure valve nominal pressure PN less than 1.6MPa valve. Medium pressure valve nominal pressure PN2.5 ~ 6.4MPa valve. High pressure valve nominal pressure PN10.0~80.0MPa valve. Ultra-high pressure valve with a nominal pressure PN greater than 100 MPa. (2) Classification by medium temperature High temperature valve t is greater than 450C. The medium temperature valve 120C is smaller than the valve whose t is less than 450C. The normal temperature valve -40C is smaller than the valve with t less than 120C. The cryogenic valve -100C is smaller than the valve with t less than -40C. Ultra-low temperature valve t is less than -100C valve. (3) Classification according to valve body materials Non-metallic material valves: such as ceramic valves, glass steel valves, plastic valves. Metal material valves: such as copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel valves, cast iron valves, carbon steel valves, cast steel valves, low alloy steel valves, high alloy steel valves. Metal valve body lining valves: such as lead-lined valves, lined plastic valves, lining enamel valves. III. General Classification This classification method is divided according to principle, function and structure. It is the most commonly used classification method at present and internationally. General opening valve, globe valve, throttle valve, instrument valve, plunger valve, diaphragm valve, plug valve, ball valve, butterfly valve, check valve, pressure relief valve safety valve, steam trap, regulating valve, bottom valve, filter, Sewage valves, etc.