Patent ID: 8449266

Claim:
A control valve for a variable displacement compressor comprising; a valve body having a solenoid section disposed at one end of the valve body in which is formed a first port for communicating with a suction pressure of the variable displacement compressor, and a second port for communicating with an internal pressure of a compressor inner chamber of the variable displacement compressor; a pressure sensing section disposed at an other end on a side opposite the solenoid section of the valve body comprising a bellows assembly which is disposed in a pressure sensing chamber composed of a case and the valve body, wherein the bellows assembly has a bellows that is retained at both ends by holders with a spring positioned between the holders allowing the bellows to expand and contract; and a valve section having a valve element, disposed at one end of a valve rod which has a communicating hole communicating with a suction chamber, wherein the internal pressure of the compressor inner chamber is adjusted by a degree of opening of the valve element with respect to a valve seat, and a variable displacement is varied; a discharge pressure of the compressor introduced to said pressure sensing chamber causing said bellows assembly to expand and contract, and applying a first urging force to said valve rod; wherein the solenoid section applies, in cooperation with the first urging force, a second urging force to said valve rod in accordance with an input signal; the degree of opening of the valve element being set in accordance with a position of said valve rod, and a rate of flow of a communicating channel for communicating the compressor inner chamber with a discharge pressure region of the compressor being adjusted; and communication between a fluid having said discharge pressure introduced to said pressure sensing chamber, and a fluid having said suction pressure introduced to said communicating hole of said valve rod being blocked by a continuous stationary contact of a cap element capable of elastic deformation which is fitted on an end of a holder side of the valve rod and a valve rod side holder.