Patent ID: 7437881

Claim:
A control valve for a variable displacement compressor, for controlling discharging amount of refrigerant in the compressor, comprising: a valve element that is disposed in a manner movable to and away from a valve hole to open and close the valve hole, the valve hole forming a refrigerant passage via which a crankcase of the compressor is communicated for introduction or delivery of the refrigerant; a shaft that is axially supporting the valve element; a solenoid that imparts a solenoid force in a valve-closing direction to the valve element via the shaft; and urging means for generating an urging force against the solenoid force, a force generated in the valve-closing direction by a resultant force of the urging force and the solenoid force being set such that the force is constant or increases, as the valve element is lifted from its valve-closing position at least to a predetermined position past a pressure control area, and decreases, after the valve element moves beyond the predetermined position.