The cylinders are made of super-hard metal(plunger hardness above HRC55), and sealed with low-resistance stepped gaskets, giving no oil-leakage, long service life and low maintenance cost.
液压缸采用特殊超硬材料，柱塞硬度达HRC55以上，密封采用低阴力阶梯圈，无漏油，使用寿命长，保养成本低；
The calculating equation of the relative rotating Angle in the leakage test of plunger and barrel assembly has been deduced by the geometric method.
利用几何方法推导柱塞偶件密封性试验中相对回转角度的计算式。
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