通过分离单向阀球座密封段，材料改为氧化锆陶瓷，密封段流道直径增加0。
The sealing sections of non-return valve ball seat were separated, material was changed into zirconium oxide ceramic, 0.
对此，一方面采用三参数流量计代替上压力计，另一方面设计了泄流式验封密封段。
Therefore a 3-parameter flow meter is used to replace the upper pressure meter, on the other hand, a seal section isd.
研究了液压凿岩机活塞与缸体间隙密封段的局部温升和能量损失，建立了其数学模型。
Local temperature rising and energy loss in sealing gap between piston and hole was analyzed and its mathematic model was set up.
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