| 摘要 |
PROBLEM TO BE SOLVED: To assemble values without causing wrong assembling, and to facilitate the manufacturing control in a hydraulic device for a back hoe provided with a load sensing system for controlling a discharge flow of a pump for supplying the pressure oil to a front device on the basis of a working load by giving a remarkable difference of the assembling condition between a pressure compensating valve of a section, in which lowering of the pressure oil supply quantity should be restricted when operating in combination, and a pressure compensating valve in other sections. SOLUTION: In an arm section and a turning section of a valve section group, a spring for generating a differential pressure between this side and the other side of the pressure compensating valve CV is eliminated, and other sections are provided with a spring 30 for generating a differential pressure between this side and the other side of the pressure compensating valve.
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