重新定位阀 件允许流体通过，滑动柱塞使第一和第二组分会合。
Valve repositioning allows fluid passage and sliding of the piston joins the first and second components.
通过建立砂粒自锁条件及实测长石砂岩、石英砂岩与泵筒镀铬层或氮化层的滑动摩擦系数值， 证实了对柱塞拉伤失效原因的推测是正确的。
The deduction is confirmed by establishing self locking conditions and determining the sliding friction coefficients between sand and chromium plating layer and between sand and nitrided surface.
配置具有拉长主体部分和止动件（54） 的柱塞（24），所述止动件以与针筒内表面液密啮合的方式滑动定位。
A plunger (24) having an elongate body portion and a stopper (54) slidably positioned in fluid-tight engagement with the inside surface of the barrel is provided.
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