Fluid controller

A fluid controller for independent metering control, the fluid controller comprising:

• spools for hydraulic actuators, wherein each of the hydraulic actuators moves bi-directionally in accordance with supply of a fluid thereto;
• and
• a housing including:
• spool holes that receive therein the respective spools;
• a pump passage;
• a tank passage;
• and
• for each of the spools, a first supply/discharge passage and a second supply/discharge passage, wherein
• at least one of the spools is a separated-type spool including a first spool and a second spool that are separated apart from each other in an axial direction of the separated-type spool,
• the spool holes include a particular spool hole that receives therein the separated-type spool,
• the first spool blocks the first supply/discharge passage from both the pump passage and the tank passage, or allows the first supply/discharge passage to communicate with one of the pump passage or the tank passage, to control a supply flow rate to or a discharge flow rate from one of the hydraulic actuators,
• the second spool blocks the second supply/discharge passage from both the pump passage and the tank passage, or allows the second supply/discharge passage to communicate with the other one of the pump passage or the tank passage, to control the supply flow rate to or the discharge flow rate from the one of the hydraulic actuators,
• the housing includes:
• a first pilot chamber faced by an end surface of the first spool, the end surface being an end surface of an opposite side of the first spool from the second spool;
• and
• a second pilot chamber faced by an end surface of the second spool, the end surface being an end surface of an opposite side of the second spool from the first spool,
• a portion of the particular spool hole between the first spool and the second spool forms a third pilot chamber, and
• the housing includes a pilot passage that communicates with the third pilot chamber,
• the fluid controller further comprising:
• a first solenoid proportional valve that outputs a first pilot pressure to the first pilot chamber;
• a second solenoid proportional valve that outputs a second pilot pressure to the second pilot chamber;
• and
• a third solenoid proportional valve that outputs a third pilot pressure to the third pilot chamber.