It is understood that the variety of valve products, the statement is not completely unified: by use (such as chemical, petroleum, power station, etc.) by medium (such as water vapor, air valve, etc.) by material (such as cast iron valves, cast steel valves, Forged steel valves, etc.) According to the connection form (such as internal thread, flange valve, etc.) by temperature (such as cryogenic valves, high temperature valves, etc.)
Most of China's current habits are differentiated by pressure and structure. Namely: According to the nominal pressure: ≤1.6MPa for the low pressure valve pressure 2.5, 4.0, 6.4MPa for the medium pressure valve ≥10MPa for the high pressure valve over 100MPa for the ultra high pressure valve
According to the type of structure, there are mainly: plug valve, gate valve, globe valve, ball valve - the medium flow for opening or closing the pipeline. Throttle valve - used to regulate the flow of pipe media. Butterfly valve—Used to open or close the media inside the pipe. Can also be used for adjustment. Safety valve—Used on boilers, container equipment and pipelines. When the medium pressure exceeds the specified value, the excess medium pressure can be automatically eliminated to ensure safe operation. Pressure reducing valve - used to automatically reduce the pressure of the medium in the pipeline and equipment. When the medium passes through the gap of the valve flap, resistance is generated to cause pressure loss, and the purpose of decompression is achieved. Hydrophobics—Used on steam pipes to automatically remove condensate to prevent steam loss or leakage. Check valves (including bottom valves) - are used to automatically prevent backflow of media in the pipe.
Classified by purpose and role: Cut-off valves - mainly used to cut off or switch 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. Regulating valves - mainly used to regulate the flow and pressure of the medium. Including regulating valves, throttle valves, pressure reducing valves, etc. Check valve type - used to prevent media from flowing backwards. Includes check valves in a variety of configurations. Diverter valves - used to separate, distribute or mix media. It includes distribution valves and traps of various structures. Safety valve type - used for safety protection when the medium is overpressured. Includes various types of safety valves.
Classified by pressure: Vacuum valve - a valve with a working pressure lower than the standard atmospheric pressure. Low pressure valve - a valve with a nominal pressure PN less than 1.6 MPa. Medium pressure valve - a valve with a nominal pressure of PN 2.5~6.4MPa. High pressure valve - a valve with a nominal pressure of PN10.0~80.0MPa. Ultra high pressure valve - a valve with a nominal pressure PN greater than 100 MPa.
Classified by media temperature: High temperature valve - -t Valves greater than 450'C. Medium temperature valve - 120 'C is less than t less than 450 'C valve. Normal temperature valve - 40 'C is less than t less than 120 'C valve. Cryogenic valve - -100 'C is less than t less than -40 'C valve. Ultra-low temperature valve - a valve with a t less than -100 'C.
Classified by body material: Non-metallic valve - 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.
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. Since the valve is widely used, it also plays a large role. For example, in power plants, valves can control the operation of boilers and steam turbines; in petroleum and chemical production, valves also control the normal operation of all production equipment and processes. The same is true in other departments. Despite this, valves are often overlooked compared to other products. For example, when installing machinery and equipment, people tend to focus on the main machinery and equipment, such as: compressors, high-pressure vessels, boilers, etc.; some also improper selection... These practices can reduce overall production efficiency or stop production, or cause other accidents. Therefore, it is necessary to carry out serious and responsible work on the selection, installation and use of the valve. This is especially true for modern industrial production and construction.
Concerned about surprises
Label: Multiple classifications of valves
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