Capacity control valve and method for controlling same

A capacity control valve that controls a flow rate or pressure of a variable capacity compressor in accordance with a valve opening degree of a valve portion, the capacity control valve comprising:

• a valve main body having a first communication passage through which a fluid of first pressure passes, a second communication passage arranged adjacent to the first communication passage, the second communication passage through which a fluid of second pressure passes, a third communication passage through which a fluid of third pressure passes, and a main valve seat arranged in a valve hole which provides communication between the second communication passage and the third communication passage;
• a solenoid that drives a rod having an auxiliary valve seat;
• a valve element having an intermediate communication passage configured to provide communication between the first communication passage and the third communication passage, a main valve portion configured to be separated from and connected to the main valve seat so as to open and close the valve hole, an auxiliary valve portion configured to be separated from and connected to the auxiliary valve seat so as to open and close the intermediate communication passage, and a shut-off valve portion configured to communicate and shut off communication between the intermediate communication passage and the first communication passage;
• and
• a first biasing member configured to bias in the valve closing direction of the main valve portion, wherein
• the rod is relatively moved with respect to the valve element so as to open and close the auxiliary valve portion.