Patent ID: 9651159
Date: 2017-05-16
CPC Classifications: E02F,F15B,F16K,Y10T

Claim:
1. A pilot signal block assembly, comprising: at least one base block, configured to be attached to a main block that includes a plurality of spools slidably installed therein, the at least one base block having a first surface and a second surface opposite to each other, the first surface coming in contact with the main block, and the base block having a plurality of receiving holes, each of the receiving holes penetrating through the base block from the first surface to the second surface to provide a pressure space for moving a spool, wherein the receiving hole is sized to allow movement of the spool from the first surface to the second surface through the receiving hole; a plurality of cartridge blocks detachably combined with the at least one base block and spaced apart from each other on the second surface of the at least one base block, the cartridge blocks being arranged corresponding to the receiving holes to cover the receiving holes respectively, 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.