Suction throttle valve of a compressor

A suction throttle valve for a compressor, wherein the compressor has a compressor housing with a suction chamber formed therein the suction throttle valve comprising:

• a suction passage formed in the compressor housing;
• a suction port formed at an inlet of the suction passage, wherein refrigerant is drawn into the suction passage from the suction port and further into the suction chamber through an inlet port formed in the compressor housing;
• a valve body movably disposed in the suction passage for adjusting the size of an opening of the inlet port communicating with the suction passage;
• an urging member for urging the valve body toward the suction port;
• a valve chamber provided in the suction passage, the urging member being disposed in the valve chamber;
• a first communication hole formed through the compressor housing, through which the valve chamber and the suction chamber are in communication with each other;
• a valve hole formed through the valve body, through which the valve chamber and the suction port are in communication with each other;
• a closing valve for closing the valve hole by a pressure difference between a pressure in the valve chamber and a pressure at the suction port;
• and
• a valve seat provided in the suction passage for limiting movement of the closing valve toward the suction port,
• wherein the valve hole is closed when the closing valve is in contact with the valve body, wherein the valve hole is open when the closing valve is in contact with the valve seat, and wherein an intermediate passage is formed in the closing valve or the valve seat, which enables communication between the valve hole and the suction port when the closing valve is in contact with the valve seat.