What are the differences and functions of valves? --Help needed

1. General classification method: This classification approach divides items based on both principles and functions as well as structure, and it is currently the most widely used classification method internationally and domestically. They generally include gate valves, globe valves, throttle valves, control valves, plug valves, diaphragm valves, stopcocks, ball valves, butterfly valves, check valves, pressure relief valves, safety valves, steam traps, control valves, foot valves, filters, and drain valves. 2. Classification by purpose and function: Control valves – mainly used to regulate the flow rate, pressure, etc. of the medium. Including control valves, throttle valves, pressure reducing valves, etc. Check valves – used to prevent the backflow of fluid. Including check valves of various structures. Shunt valves – used to separate, distribute, or mix media. Including distribution valves and steam traps of various structures, etc. Safety valves – used for safety protection when the pressure of the medium exceeds a certain level. Including various types of safety valves. Shut-off valves – mainly used to cut off or allow the flow of a medium. These include gate valves, globe valves, diaphragm valves, ball valves, plug valves, disc valves, plunger valves, ball plug valves, and needle-type control valves. 3. Classification by pressure: Vacuum valves – valves that operate at pressures below standard atmospheric pressure. Low-pressure valve – a valve with a nominal pressure PN of less than 1.6 MPa. Medium-pressure valves – valves with a nominal pressure of PN 2.5–6.4 MPa. High-pressure valve – valves with a nominal pressure of PN10.0–80.0 MPa. Ultra-high pressure valves – valves with a nominal pressure PN greater than 100 MPa. 4. Classification by medium temperature: High-temperature valves – valves with a temperature t greater than 450°C. Medium-temperature valve — a valve for temperatures between -120°C and 450°C. Normal temperature valves – valves for temperatures ranging from 40°C to less than 120°C. Low-temperature valve – a valve for temperatures where 100°C < t < -40°C. Ultra-low temperature valves – valves for temperatures below -100°C. 5. Classification by valve body material: Metal valve body lined valves – lead-lined valves, plastic-lined valves, and enamel-lined valves. Non-metallic material valves – such as: ceramic valves, fiberglass-reinforced plastic valves, plastic valves. Metal material 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.

The answers to these questions can be found in the \"Valve Design Manual\" and the \"Process Piping Installation Design Manual\". Or search on the forum; there are comprehensive answers there.

For some questions, there are excellent posts on the forum; for similar, less complex questions, the poster should first search the forum.

You can just look it up on Baidu by yourself

Everyone, for those like the original poster who have only recently arrived in Haichuan, there might be some functions of Haichuan that they are not aware of, or even unable to use yet I hope that those who have just arrived in Haichuan can be given more understanding and guidance; their questions should be answered carefully. Helping someone once is equivalent to learning again oneself. Benefiting others as well as oneself – why not do it?

You can make full use of the search function on our Haichuan Forum to find it! :handshake :handshake :handshake