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Vacuum pump for remove steam

The capacity of vacuum pump to extract steam is generally indicated by the maximum steam allowable pressure gauge. Maximum inlet pressure of vacuum pump when pure water vapor is continuously excluded in standard state. Expressed by hpa. Maximum steam allowable pressure of vacuum pump with air ballast valve: Pwo=B/S*Pe*(Ps-Pa)/(Pe-Ps).


When the exhausted gas is completely steam, the exhaust pressure of water vapor compressed to 400 hPa is far from 1333 hpa. Water vapor begins to condense into liquid. Water vapor can not be removed by vacuum pump, and all of it condenses in vacuum pump. Normal vacuum pump can not discharge pure steam from the vacuum pump chamber. As long as the partial pressure of water vapor during compression is less than its saturation pressure, the vapor can be discharged from the vacuum pump chamber. In order to extract pure steam, it is necessary to infiltrate a certain amount of dry air into the process of steam compression so that the partial pressure of steam at the end of exhaust compression is less than the saturation pressure of steam. The air seepage device is called air ballast valve.


If the pressure of a liquid at a certain temperature is lower than its saturated vapor pressure, it will evaporate and become vapor, which is condensable gas. However, when the pressure is greater than the saturated vapor pressure, the vapor condenses into a liquid. The working temperature of oil-sealed vacuum pump is generally 70-800C when it works continuously, and the saturation pressure of water vapor is about 400 hPa at this time.

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