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原文
Gas ballast valve on the water vapor compression principle In addition to being pumped water vapor, should be compressed in the compression room, until the exhaust valve opens up, assuming that the temperature inside the pump is 60 ℃, then the temperature of water in the saturated vapor pressure is 20000 Pa, in the compression process Once you reach the water vapor pressure above about when it starts to condense into water, but 20 000 Pa push Shihai not open the exhaust valve, exhaust valve is the way to the atmosphere as well as suppress the exhaust valve spring, which is the pump pressure to compress the internal cavity to 120,000 Pa or more to open the exhaust valve, water vapor after compression to the compression stage have all been condensed into water, and mingled inside to pump oil. In order to meet the requirements of moist air out, instead of having oil vapor contamination. Therefore, the oil seal vacuum pump to be equipped with a gas ballast device. Its principle is in the compression process a certain amount of air into the gas mixture to increase the pressure, the pressure of the gas mixture of air and water vapor partial pressure and partial pressure of the steam partial pressure has not reached the pump temperature saturation vapor pressure, the mixed gas pressure had more than the pressure of the exhaust valve opens the exhaust valve, so that the steam late in the pump chamber was excluded from the pump liquid outside.
原文来自：http://www.anquanfa.org

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译文：
被泵抽除的水蒸汽，应该在压缩室内压缩，直到排气阀打开为止，如果假设泵内的温度是60℃，那么在这一温度下水的饱和蒸汽压就是20000帕，在压缩过程中的水蒸汽一旦达到上面讲的压力时，就会开始凝结成水，但是20000帕时还推不开排气阀，因为排气阀是通向大气还有排气阀的弹簧压住，也就是泵腔的内部压力要压缩到120000帕以上才能推开排气阀，水蒸汽压缩以后，到压缩末期已全部凝结为水，而混到真空泵油里头去。为了满足抽出潮湿空气的要求，而不致于水蒸气污染油质。所以，油封式真空泵要装有气镇装置。它的原理就是在压缩过程中放入一定量的空气以提高混合气体的压力，混合气体的压力为空气的分压力和水蒸气的分压力之和，在蒸汽的分压力还没有达到真空泵温度下的饱和蒸汽压时，混合气体压力就已超过了排气阀的压力而打开排气阀，使蒸汽来不及在泵腔中液化就被排除在泵外。

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