Construction machine equipped with a hydraulic control valve and a hydraulic control valve that is integrated with a pressure compensating valve and the pressure compensating valve

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic device which contributes to operability improvement of a construction machine such as a hydraulic shovel.;SOLUTION: A pressure compensation valve comprises: an action chamber 61 in which peak load pressure of another actuator is introduced to one end of a valve element of the pressure compensation valve that freely slides; an action chamber 60 in which self-pressure is introduced to opposite one end; a notch 53 for controlling a flow rate outside of the valve element as a first passage D for a hydraulic solution; a valve element inside passage 56 connected through the notch to a supply passage to the actuator, as a second passage E for the hydraulic solution; and a throttle 52a in an inlet of the passage for the second hydraulic solution for causing the hydraulic solution to fall down with pressure. Through the throttle, the passage is branched into an action chamber introduction port for the self-pressure and the valve element inside passage, further, the valve element inside passage is branched into a maximum load pressure introduction port and the supply passage to the actuator, a maximum load pressure introduction passage is connected with a maximum load pressure passage via a check valve 64, and the supply passage to the actuator is confluent with the first passage.;COPYRIGHT: (C)2014,JPO&INPIT