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The ratio of the exhaust pressure to the intake pressure of the pump is called the compression ratio. Compression ratio is not only related to the pump series and speed, but also related to the type of gas. The gas with high molecular weight has high compression ratio. The compression ratio of nitrogen (or air) is 108 ~ 109; For hydrogen, 102 ~ 104; The ratio of the exhaust pressure to the intake pressure of the pump is called the compression ratio. Compression ratio is not only related to the pump series and speed, but also related to the type of gas. The gas with high molecular weight has high compression ratio. The compression ratio of nitrogen (or air) is 108 ~ 109; For hydrogen, 102 ~ 104; The ratio of the exhaust pressure to the intake pressure of the pump is called the compression ratio. Compression ratio is not only related to the pump series and speed, but also related to the type of gas. The gas with high molecular weight has high compression ratio. The compression ratio of nitrogen (or air) is 108 ~ 109; For hydrogen, 102 ~ 104; The ratio of the exhaust pressure to the intake pressure of the pump is called the compression ratio. Compression ratio is not only related to the pump series and speed, but also related to the type of gas. The gas with high molecular weight has high compression ratio. The compression ratio of nitrogen (or air) is 108 ~ 109; For hydrogen, 102 ~ 104; The ratio of the exhaust pressure to the intake pressure of the pump is called the compression ratio. Compression ratio is not only related to the pump series and speed, but also related to the type of gas. The gas with high molecular weight has high compression ratio. The compression ratio of nitrogen (or air) is 108 ~ 109; For hydrogen, 102 ~ 104;