Control valve of variable displacement compressor

A control valve used for a variable displacement compressor installed in a refrigerant circuit of an air conditioner, wherein the compressor has a control chamber and a control passage, which connects the control chamber to a pressure zone in which the pressure is different from the pressure of the control chamber, wherein the displacement of the compressor is varied in accordance with the pressure of the control chamber, the control valve comprising:

• a valve housing;
• a valve chamber defined in the valve housing to form a part of the control passage;
• a transmission rod for moving along the axis direction of the valve housing, wherein the transmission rod has a valve body, which is accommodated in the valve chamber for adjusting the opening size of the control passage;
• a pressure sensing member, which moves in accordance with the pressure difference between two pressure monitoring points located in the refrigerant circuit, wherein the pressure sensing member moves the valve body such that the displacement of the compressor is varied to counter changes of the pressure difference;
• an actuator for applying force to the transmission rod in accordance with external commands, wherein the actuator has a movable iron core, which is shaped like an inverted cup, and a stationary core, wherein the stationary core is located between the valve body and the movable core, wherein the movable iron core has a lid portion, wherein the lid portion faces to the stationary core, wherein the force applied by the actuator corresponds to a target value of the pressure difference, wherein the pressure sensing member moves the valve body such that the pressure difference seeks the target value;
• an urging member accommodated in the valve chamber, wherein the urging member urges the valve body in a direction to open the control passage;
• and
• a spring seat located on the transmission rod to hold an end of the urging member.