The detailed classification of the valve and the main parameters

The valve is the control part of the pipeline fluid conveying system. It is used to change the channel cross section and the medium flow direction, and has the functions of diversion, cut-off, throttling, stop, shunt or overflow relief. Valves for fluid control, from the simplest cut-off valve to the extremely complex automatic control system used in a variety of valves, its variety and specifications, the nominal diameter of the valve from a very small instrument valve to a diameter of 10m Industrial piping valves. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 0.0013MPa to 1000MPa, From -270 ℃ ultra-low temperature to 1430 ℃ high temperature. Valve control can be used in a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-liquid, spur gear, bevel gear drive; Or other forms of sensor signals, according to the intended requirements of action, or do not rely on the sensor signal for a simple open or closed, the valve by the drive or automatic mechanism to make the opening and closing parts for lifting, sliding, swing or swing Movement, thereby changing the size of its flow area to achieve its control function

By action and use

(1) truncated categories: such as gate valve, globe valve, plug valve, ball valve, butterfly valve, needle valve, diaphragm valve. Truncated valve, also known as closed-circuit valve, cut-off valve, its role is to turn on or cut off the medium in the pipeline.

Check valve, check valve, also known as check valve or check valve, check valve is an automatic valve, its role is to prevent the pipeline in the medium back to prevent the pump and drive motor reversal, and container media leakage The Water pump off the end of the valve is also a check valve.

Explosion-proof valve, accident valve, the role of the safety valve is to prevent the pipeline or device in the medium pressure exceeds the specified value, so as to achieve the purpose of security protection.

Regulating valve, throttle valve and pressure reducing valve, its role is to adjust the medium pressure, flow and other parameters.

(2) vacuum categories: such as vacuum ball valve, vacuum baffle valve, vacuum inflatable valve, pneumatic vacuum valve. Its role is in the vacuum system, used to change the direction of the air flow, adjust the size of the air flow, cut off or turn on the vacuum system components called the vacuum valve.

(3) special purpose categories: such as clear valve, vent valve, sewage valve, exhaust valve, filter and so on. Exhaust valve is essential in the pipeline system auxiliary components, widely used in boilers, air conditioning, oil and gas, water supply and drainage pipes. Often installed in the high point or elbow, etc., to exclude excess gas in the pipeline to improve the efficiency of pipeline use and reduce energy consumption.

According to the main parameters

According to nominal pressure

(1) vacuum valve: refers to the working pressure below the standard atmospheric pressure of the valve.

(2) low pressure valve: refers to the nominal pressure PN ≤ 1.6Mpa valve.

(3) medium pressure valve: refers to the nominal pressure PN 2.5Mpa, 4.0Mpa, 6.4Mpa the valve.

(4) high pressure valve: refers to the nominal pressure PN is 10.0Mpa ~ 80.0Mpa the valve.

(5) ultra-high pressure valve: refers to the nominal pressure PN ≥ 100.0Mpa the valve.

(6) filter: refers to the nominal pressure PN is 1.0Mpa, 1.6Mpa

According to the working temperature

(1) ultra-low temperature valve: for the media operating temperature t <-101 ℃ valve.

(2) room temperature valve: for the media operating temperature -29 ℃ <120 ℃ valve. <> <120 ℃ valve. <>

(3) temperature valve: for the media operating temperature 120 ℃ <425 ℃ valve. <> <425 ° C valves. <>

(4) high temperature valve: for the media operating temperature t> 425 ℃ valve.