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.
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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