Hydraulic control device for hoist- or lift-drive, includes valve device connected between pump and lift system such that while load is being held, pump is protected and joined via working line to lift system

摘要

Hydraulic control device having a working line (14) branched between a valve device (18) and a lift system (15) into two parallel branched lines (26,27), of which each runs to one of two lift cylinders (22,23) and in one of the two lines (26,27) is provided a switch-over valve (28) via which depending on the pressure in the other lift cylinder (23), one of the hydro-cylinders (22) can be separated from the pump (12) and joined to the tank (13).