| 摘要 |
A hydraulic power cylinder is provided with a full diameter end seal through which the output force push rod extends. The seal covers the full face of the end cover, provides a static seal at the cylinder side wall, and a sliding seal on the push rod. It functions in conjunction with the seal expander plate to provide a vacuum seal around the push rod so that the hydraulic cylinder can be evacuated of air during the hydraulic fluid filling operation. The seal arrangement includes another annular seal which also fits around push rod and wipes the push rod to prevent fluid from being transferred along the push rod to the exterior of the hydraulic cylinder.
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