Control valve for variable capacity compressors

摘要

A control valve for a variable capacity compressor, which makes it possible to increase the full open flow rate so as to make it applicable to even a compressor of large capacity without inviting any substantial increase in size and weight, and to minimize the quantity of leakage of cooling medium from the valve chamber into the suction pressure cooling medium-introducing chamber to thereby make it possible to enhance the accuracy of control and to suppress the occurrence of operational failure including the clogging due to foreign substances, the locking of valve rod, etc. The valve rod is provided, at a lower portion thereof, with a lower valve body portion (16A) and an upper valve body portion (16B), and the valve chamber is provided with a lower valve seat (22a) and an upper valve seat (22b) in such a manner that the lower valve body portion (16A) and the upper valve body portion (16B) are concurrently enabled to detachably contact with their respective valve seats, and a lower cooling medium outlet chamber (26A) and an upper cooling medium outlet chamber (26B) are disposed on the downstream sides of the lower valve seat (22a) and of the upper valve seat (22b), respectively.