| 摘要 |
A hydraulic jack in which working surfaces of body and piston are arranged at angle to cylindrical surfaces, at that places of transition of cylindrical surfaces to working ones and places of transition of cylindrical surfaces of grooves at side of installation of protective ring to end surfaces of grooves are arranged in radius, at that grooves are arranged in such a way that one side of those is open to the cavity, and protective rings have thickness larger than thickness of packing ring and shape providing adjoining packing ring and radius of groove as well.
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