| 摘要 |
PCT No. PCT/SE88/00328 Sec. 371 Date Feb. 26, 1990 Sec. 102(e) Date Feb. 26, 1990 PCT Filed Jun. 16, 1988 PCT Pub. No. WO88/10342 PCT Pub. Date Dec. 29, 1988.By providing the work blade of a grader with a hydraulic regulation system where pressure limiting valves (14, 15, 16, 17) guide pressure reducing valves (10, 11, 12, 13) a constant pressure regulation of the work blade is achieved so that the work pressure set by the operator from his cab is maintained almost independent of the irregularities of the underlying surface.
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