HYDRAULIC CIRCUIT IN WORK MACHINE

摘要

PROBLEM TO BE SOLVED: To improve operability when an interlocking operation or a fine operation is performed for a plurality of hydraulic actuators in a hydraulic circuit provided with a pilot operating type control valve for performing pressure oil supply controls for the hydraulic actuators and a pilot valve for outputting pilot pressure corresponding to operating tool manipulated variable. SOLUTION: A pilot pressure control valve device 16 constituted of a pressure reduction valve 18 for reducing pilot pressure and a selector valve 19 switching by an external signal is provided in a pilot oil passage D from a pilot valve 14B to a control valve 12.