| 摘要 |
PCT No. PCT/EP88/00231 Sec. 371 Date Sep. 7, 1989 Sec. 102(e) Date Sep. 7, 1989 PCT Filed Mar. 22, 1988 PCT Pub. No. WO88/07633 PCT Pub. Date Oct. 6, 1988.In a hydraulic drive, in which a double-acting working cylinder (10) is connected to the hydraulic power source by very long working lines (20, 22), it is proposed to connect a bypass line (36) containing a normally closed bypass valve (38) to the ends of the working lines (20, 22) nearest the cylinder. The bypass valve (38) is periodically opened to allow the fluid contained in the working lines (20, 22) to be completely replaced.
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