Capacity control valve and control method for capacity control valve

A capacity control valve for controlling a flow rate or pressure of a variable capacity compressor according to a valve opening of a valve section, the capacity control valve comprising:

• a valve main body having a first communication passage through which a fluid at a first pressure passes, a second communication passage which is arranged adjacent to the first communication passage and through which a fluid at a second pressure passes, a third communication passage which is arranged adjacent to the second communication passage and through which a fluid at a third pressure passes, a valve chamber consecutively provided with the third communication passage, and a main valve seat arranged in a valve hole for communicating the second communication passage and the third communication passage;
• a solenoid which drives a rod having an auxiliary valve seat;
• a valve body having an intermediate communication passage for communicating the first communication passage and the third communication passage, a main valve part for opening and closing the valve hole by separating from and contacting the main valve seat, and an auxiliary valve part fitted to the main valve part for opening and closing the intermediate communication passage by separating from and contacting the auxiliary valve seat;
• a first biasing member which biases the main valve part in a valve closing direction thereof;
• a second biasing member which biases the main valve part in a valve opening direction thereof;
• and
• a pressure-sensitive body arranged in the valve chamber;
• wherein the pressure-sensitive body expands and contracts according to the first pressure transmitted through the first communication passage and the intermediate communication passage when the auxiliary valve part is closed, and
• the rod relatively moves to the valve body, and opens and closes the auxiliary valve part.