Control valve of displacement variable compressor

A control valve for a cooling apparatus having a compressor, which includes a displacement control mechanism, and an external refrigerant circuit, which is connected to the compressor to form, together with the compressor, a cooling circuit, wherein the control valve changes the discharge displacement of the compressor by controlling a control pressure that acts on the displacement control mechanism, the valve comprising:

• a housing;
• an internal passage provided in the housing, the internal passage including a valve chamber;
• a movable valve body provided in the valve chamber for controlling the opening degree of the internal passage;
• a first pressure sensing structure, which senses the difference between two pressure monitoring points located in the cooling circuit, wherein the difference is a primary pressure, wherein the first pressure sensing structure transmits a force corresponding to the primary pressure to the valve body;
• and
• a second pressure sensing structure, which senses a secondary pressure that is different from the primary pressure and applies a force corresponding to the secondary pressure to the valve body, wherein the valve body is positioned in the valve chamber by a combination of forces corresponding to the primary pressure and the secondary pressure to control the opening degree of the internal passage.