Operating valve assembly with pressure compensation valve

An operating valve assembly comprising:

• a valve body;
• a spool bore formed through a central portion of said valve body, to which a first hydraulic pressure passage introducing a supply pressure from a hydraulic pressure source, a second hydraulic pressure passage supplying a control pressure to a hydraulic load, a third hydraulic pressure passage selectively communicating said first and second hydraulic pressure passages, and a fourth hydraulic pressure passage connected to a low pressure side of said hydraulic pressure source for recirculating a working fluid to said hydraulic pressure source are opened;
• a spool slidably disposed within said spool bore for movement between a neutral position and at least one displaced position displaced axially from said neutral position, wherein said spool operates to establish communication between said first and third hydraulic pressure passages and between second and fourth hydraulic pressure passages when in said at least one displaced position, and wherein said spool operates to block communication between said first and third hydraulic pressure passages and between said second and fourth hydraulic pressure passages when in said neutral position;
• a pressure compensation valve provided in parallel to a central axis of said spool bore at a position offset from the axis of said spool bore in a direction perpendicular to said axis, and establishing and blocking communication between said second and third hydraulic pressure passages for controlling the control pressure to be supplied to said hydraulic load depending upon a load pressure;
• load pressure detecting means formed in said spool and communicated with said second hydraulic pressure passage for generating a detected load pressure corresponding to the load pressure of said hydraulic load;
• and
• load pressure supply means for supplying detected load pressure to said pressure compensating means via said spool bore when said spool is in said neutral position, said load pressure supply means detecting highest pressure among detected load pressures detected by respective load pressure detecting means of a plurality of operating valve assemblies as the detected load pressure and supplying the highest load pressure to a respective pressure compensating valve of the plurality of operating valve assemblies.