采用本发明的技术方案，可以将气缸的余隙尽可能控制得小，以提高容积效率。
The technical project adopted in present invention can help control remaining gap of the air cylinder as little as possible to improve volume efficiency.
在高压力作用下，余隙容积的存在会降低液力端的容积效率。
In the effect of heavy pressure, the existence of the clearance volume will reduce the efficiency of the hydraulic end.
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