| 摘要 |
The invention regards a hydraulic cylinder ( 1 ) or a plug comprising a hydraulic cylinder for operation of anchoring and or sealing devises, where the hydraulic cylinder comprising a cylinder chamber ( 6 ), a piston head ( 4 ) within said cylinder chamber ( 6 ) forming two sub chambers ( 7, 7 ') of said cylinder chamber ( 6 ) one on each side of the piston head ( 4 ), and a piston rod ( 5 ) which runs through the piston head ( 4 ) and said two sub chambers ( 7, 7 ') or only one of said cub chambers. The hydraulic power unit ( 8 ) for operation of the hydraulic cylinder ( 1 ) is situated at least partly within the parts forming the hydraulic cylinder ( 1 ) itself, preferably the piston head ( 4 ) and or the piston rod ( 5 ).
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