CONTROL VALVE FOR VARIABLE DISPLACEMENT COMPRESSOR

Provided is a variable-capacity compressor control valve that can efficiently cancel the influence of the refrigerant pressure acting on a main valve element and avoid increase in complexity of the structure and size of the control valve. A pressure equalizing passage 15 is provided which is adapted to guide a suction pressure Ps acting on the upper end of a main valve element 10 to a Ps introduction chamber 48B provided at the lower end of the main valve element 10 so that the suction pressure Ps acts on the lower end of the main valve element. When an electromagnetic actuator 30 (or a solenoid portion 30A thereof) is not supplied with current (i.e., when a valve orifice 22 is fully open), the introduction of a pressure Pc in a crank chamber from Pc inlet/outlet ports 26 into the Ps introduction chamber 48B is stopped, and the suction pressure Ps is introduced into the Ps introduction chamber 48B via the pressure equalizing passage 15 so that the suction pressure Ps acts on the upper and lower ends of the main valve element 10.