Pilot signal block assembly for construction machinery and control valve assembly having the same

A pilot signal block assembly, comprising:

• at least two base blocks spaced apart from each other in a first direction, each of the base blocks having a first surface and a second surface opposite to each other, and having a plurality of receiving holes, each of the receiving holes penetrating through the base block from the first surface to the second surface and configured to allow movement of a spool in one direction from the first surface to the second surface;
• a plurality of cartridge blocks removably attached to the base block, arranged on the second surface of the base block corresponding to the receiving holes to cover the receiving holes respectively, and spaced apart from each other in a second direction, each of the cartridge blocks including a signal passage that is in fluid communication with a corresponding receiving hole of the plurality of receiving holes to supply a pilot oil to the corresponding receiving hole;
• and
• a plurality of electro proportional pressure reducing valves installed in the cartridge blocks respectively and configured to control opening rates of the signal passages according to electric control signals.

A control valve assembly, comprising:

• a main block having a spool that is installed movably therein to control a path into which a working fluid discharged from a hydraulic pump flows;
• a first pilot signal block assembly comprising:
• at least two base blocks arranged on a first side of the main block and spaced apart from each other and having a plurality of receiving holes configured to facilitate movement of the spool in one direction,
• a plurality of cartridge blocks arranged on a surface of the at least two base blocks and spaced apart from each other, each of the cartridge blocks including a first signal passage that is in fluid communication with a corresponding receiving hole of the plurality of receiving holes to supply a pilot oil to the corresponding receiving hole, and
• a first electro proportional pressure reducing valve installed in each of the cartridge blocks configured to control an opening rate of a corresponding first signal passage of the first signal passages according to an electric control signal;
• and
• a second pilot signal block assembly comprising:
• at least two pilot signal blocks arranged on a second side of the main block opposite to the first side of the main block and spaced apart from each other and having a plurality of second signal passages configured to facilitate movement of the spool in a direction reverse of the one direction, and
• a second electro proportional pressure reducing valve installed in the second pilot signal block and configured to control an opening rate of a corresponding second signal passage of the second signal passages according to an electric control signal.