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 pressure Pc in a crank chamber acting on the lower end of a main valve element 10 to a pressure-sensitive chamber 45 so that the pressure Pc in the crank chamber acts on the upper end of the main valve element 10. 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 suction pressure Ps from Ps inlet/outlet ports 27 (Ps inlet/outlet chamber 28) into the pressure-sensitive chamber 45 is stopped, and the pressure Pc in the crank chamber is introduced into the pressure-sensitive chamber 45 via the pressure equalizing passage 15 so that the pressure Pc in the crank chamber acts on the upper and lower ends of the main valve element 10.