Capacity control valve

A capacity control valve comprising:

• a valve housing provided with a suction port through which a suction fluid of suction pressure passes, and a control port through which a control fluid of control pressure passes;
• a valve element configured to be driven by a solenoid;
• a first spring that biases the valve element in a direction opposite to a driving direction of the solenoid;
• and
• a control-suction valve formed by a control-suction valve seat provided on an inner peripheral surface of the valve housing and the valve element, the control-suction valve being configured for opening and closing a communication passage between the control port and the suction port by causing the valve element to separate from and come into contact with the control-suction valve seat, wherein
• the control pressure is controlled in accordance with opening and closing operation of the control-suction valve,
• a space configured for communicating with the control port is formed inside the valve housing and arranged on a back surface side of the valve element,
• the valve element has a contact portion which is capable of coming into contact with the control-suction valve seat and which is housed in a valve chamber communicating with the suction port,
• the valve chamber is formed by a single continuous space,
• the control-suction valve seat is provided so as to face the valve chamber,
• the control pressure of the control fluid acts on the valve element through the communication passage which provides a communication between the valve chamber and a control fluid supply chamber communicating with the control port, and
• a supplemental spring is arranged in the control fluid supply chamber and interlockingly coupled to the valve element.