A capacity control valve includes a valve housing provided with a discharge port, suction ports, a control port and a primary valve driven by a solenoid. The capacity control valve further includes a differential CS valve which includes a differential CS valve body disposed so as to be relatively movable in an axial direction with respect to the primary valve bodies. The differential CS valve body divides a control pressure chamber into a discharge side control chamber communicating with the first control port and a suction side control chamber communicating with the second control port in the axial direction and operates the differential CS valve body by a differential pressure between the discharge side control chamber and the suction side control chamber so as to open the second control port and the suction port.

A capacity control valve is provided with a throttle valve portion having a communication hole and a second valve hole. The communication hole is provided between a second valve portion and a third valve portion and makes an intermediate communication passage communicate with a third valve chamber. The second valve hole is provided between a second valve chamber and the third valve chamber. An amount of narrowing of the throttle valve portion in relation to a stroke of a valve element is set larger when the second valve portion initially opens by separating from a second valve seat face, and then becomes narrower after the initial opening of the valve. The capacity control valve is capable of shortening a start-up time and improving the operating efficiency of a variable capacity compressor.

A capacity control valve includes a valve housing formed with a discharge port, a suction port, and first and second control ports, a rod arranged in the valve housing and driven by a solenoid, a CS valve 50 configured to control a fluid flow between the first control port and the suction port in accordance with a movement of the rod, and a DC valve configured to control a fluid flow between the second control port and the discharge port in accordance with the movement of the rod. In a non-energization state of the solenoid, the CS valve is closed and the DC valve is opened. As the energization of the solenoid becomes larger, the CS valve transitions from a closed state to an open state, and the DC valve is throttled from an open state and thereafter transitions to the open state.

Provided is a capacity control valve that can be produced with good workability and at a low cost. A capacity control valve includes: a valve housing in which a flow passage is formed; and a valve body disposed inside the valve housing and driven by a solenoid. A valve seat member having a tubular shape and including a valve seat on which the valve body is seatable is press-fitted into the valve housing, and at least the valve seat of the valve seat member is harder than the valve housing.

A branch passage which branches off from a portion of a supply passage on the downstream side of a supply control valve and communicates with a suction chamber is provided, and when providing a release control valve which, while allowing working fluid to flow, moves in response to the differential pressure between the downstream side pressure of the supply control valve and the pressure of a control pressure chamber on the supply passage, while preventing the movement of a valve element from being inhibited by a foreign substance in refrigerant, a leakage of the refrigerant into a suction chamber is suppressed when supplying the refrigerant from a discharge chamber to the control pressure chamber via the supply passage, enhancing control performance. A release control valve 51 has a valve element 60 including a valve body 62 which, being disposed, in a valve housing space 50 provided on a supply passage 40, so as to be movable in an axial direction of the valve housing space 50, varies the degree of opening of the communication between a control pressure chamber 4 and a branch passage 43, and a flange 63 which is abutted, in an axial direction of the valve housing space, against a shoulder 52 formed on the inner peripheral wall of the valve housing space 50, thereby sealing between the valve body 62 and the inner peripheral wall of the valve housing space 50, wherein a configuration is such that the branch passage 43 is covered by the valve body 62 in a state in which the flange 63 is abutted against the shoulder 52.

A variable displacement compressor which prevents leakage of a refrigerant flowing directly into a suction chamber without passing via a crank chamber at a time of a minimum discharge displacement operation, thus making it possible to prevent an increase of a minimum discharge displacement by increasing a refrigerant pressure in the crank chamber, and in addition, making it possible to prevent insufficient lubrication of sliding portions and the like in the crank chamber.

A compressor includes a cylinder housing having a number of pistons, a control chamber communicating with piston casings, a suction chamber and a discharge chamber communicating with the piston casings, a control valve includes a receptacle engaged in the cylinder housing, a valve member engaged in the receptacle for controlling the pressurized air to flow from the discharge chamber into the control chamber of the cylinder housing, and a valve element for controlling a bypass of the pressurized air through the receptacle. A bellow device is connected to actuate the sliding member internally, and a sliding member is slidably engaged in the control space of the receptacle, and to operate the valve element externally with a solenoid device.

Disclosed is a capacity control valve includes a valve housing. A main valve including a valve body is driven by a solenoid, and a main valve seat which is between a discharge port and a control port and with which the valve body can contact, a pressure sensitive valve member forms a pressure sensitive valve, together with a pressure sensitive body disposed in a pressure sensitive chamber. The control port and a suction port communicate with each other through an intermediate communication passage by opening and closing of the pressure sensitive valve. The pressure sensitive valve member has a through-hole communicating with the intermediate communication passage, and has an opening and closing member attached thereto such that the opening and closing member is restricted in movement with respect to the valve housing by restriction device and slides relative to the pressure sensitive valve member to open and close the through-hole.

Variable displacement compressor 100 has second control valve 350 for adjusting the opening degree of pressure release passage 146. Second control valve 350 includes partition member 351, which partitions valve chamber 351c and back pressure chamber 351d, and has side wall 351a surrounding valve portion 352b of spool 352, and end wall 351b connected to one end side of side wall 351a and through which shaft portion 352b of spool 352 penetrates. Furthermore, in second control valve 350, end surface 351a1 opposite to the end wall of the side wall of partition member 351 abuts on the wall surface opposite to the back pressure chamber of the valve chamber 351c. When the valve portion 352b of spool 352 abuts on the wall surface, pressure receiving portion 352a of spool 352 abuts on end wall 351b.

A control valve includes: a first valve to control a flow rate of refrigerant flowing from a discharge chamber to a control chamber of a compressor; a second valve to control a flow rate of the refrigerant flowing from the control chamber to a suction chamber; a solenoid to generate a drive force in a first valve closing direction and a second valve opening direction; a biasing member to generate a biasing force in an first valve opening direction and a second valve closing direction; and a pressure sensing part to sense a pressure in the suction chamber or the control chamber, and generate a counterforce against the drive force. A state in which both of the first and second valves are open is present during an increase in the current supplied to the solenoid from zero to an upper limit current value, and an increase rate of an opening degree of the first valve is increased during a decrease in the current supplied to the solenoid, a predetermined lower limit current value being an inflection point of the increase.