Iivalvu ze-hydraulic counterbalance luhlobo lwesivalo esisetyenziselwa ukulawula ukuhamba kolwelo kwisixokelelwano samanzi. Ngokuqhelekileyo zisetyenziselwa ukuthintela imithwalo engaphezulu, enokuthi yonakalise izixhobo okanye ibangele ukulimala.