The characteristics of vacuum pneumatic valve and the selection basis

vacuum pneumatic valve is used to adjust the air flow in the vacuum system, cutting off and connect piping components, according to its working principle is mainly divided into the pneumatic valve, pneumatic valve, pneumatic butterfly valve, pneumatic valve, pneumatic valve, electromagnetic damper pneumatic ball valve, safety pneumatic valve, regulating valve and so on.
vacuum pneumatic valve has the following characteristics:
working pressure below atmospheric pressure, and the pressure drop on the pneumatic disc cannot exceed KGF/cm. The working temperature of medium depends on the process using the device. Temperature is generally not more than - The scope of ℃ ~ +.
is the most basic requirements for this kind of pneumatic valve guarantee connecting the height of the sealing and the structure and the density of gasket materials.
according to medium pressure vacuum pneumatic valve can be divided into four groups:
a, low vacuum pneumatic valves: medium pressure p = ~ MMHG;
2, in the vacuum pneumatic valves: p = x - Mm hg.
3, high vacuum pneumatic valve: p = x - ~×- Mm hg.
vacuum pneumatic valve selection basis to consider are the following:
a, according to the working pressure is low vacuum pneumatic valve, high vacuum pneumatic valves and ultra high vacuum pneumatic valve.
2, according to the structural characteristics of a butterfly pneumatic valve, pneumatic ball valves, pneumatic diaphragm valve, pneumatic valve, flashboard baffle pneumatic valve, Angle valve, pneumatic valve, pneumatic valve tee.
3, according to the principle of transmission with manual, pneumatic, electric, electromagnetic. General pneumatic is the process of electromagnetic pilot to perform an action, cylinder, also can use the hand control pilot process of pneumatic valve cylinder to perform an action. Dual electric hand, electric operated manually when the power failure is available.
4, according to the material have stainless steel, carbon steel, aluminum alloy as the main material of the pneumatic valve.
5, according to the dynamic seal material also can be divided into metal sealing and nonmetal sealing pneumatic valves. Shaft seal with O shaped rubber ring general vacuum dynamic seal leakage rate for the - Pa. L/S, vacuum degree is not high, in the process of axial movement can be used in the high vacuum of request is not high under the condition of use; Shaft seal for the metal bellows seal, the leakage rate of - Pa. L/S, is suitable for using ultra high vacuum conditions.