Control valve for variable displacement compressor

A control valve applicable to a variable displacement compressor having a suction chamber, a discharge chamber, and a control chamber, and having a discharge capacity varied by regulating a pressure in the control chamber, the control valve comprising:

• a body having a control chamber communication port communicating with the control chamber and a suction chamber communication port communicating with the suction chamber;
• a valve element that moves toward and away from a valve hole to close and open a bleed valve, the control chamber communication port and the suction chamber communication port communicating with each other through the valve hole;
• a solenoid to generate a drive force in an opening direction of the bleed valve depending on an amount of supplied current;
• and
• a pressure sensing element to sense a pressure in the suction chamber or a pressure in the control chamber, and to generate a counterforce against the drive force from the solenoid depending on a magnitude of the sensed pressure,
• wherein an opening degree of the bleed valve is controlled so that the sensed pressure becomes a set pressure associated with the amount of current supplied to the solenoid,
• wherein a bleed passage for delivering refrigerant introduced through the control chamber communication port to the suction chamber even while the bleed valve is in a closed state is formed,
• wherein the body further has a discharge chamber communication port communicating with the discharge chamber, and
• wherein a supply valve for delivering refrigerant introduced through the discharge chamber communication port to the control chamber even while the bleed valve is controlled is provided,
• wherein a valve chamber is provided between the control chamber communication port and the valve hole,
• wherein a valve element of the bleed valve includes:
• a sliding portion slidably supported in the valve hole;
• a spool portion inserted into and removed from the valve hole;
• and
• a reduced-diameter portion between the sliding portion and the spool portion, and
• wherein a cut-out reaching the reduced diameter portion and the valve chamber is formed in a lateral side of the valve element, the cut-out forming the bleed passage allowing the valve hole and the valve chamber to constantly communicate with each other.