A capacity control valve includes a main valve that opens and closes communication between a discharge port and a control port formed in a valve housing by movement of a rod driven by a solenoid, a CS communication passage providing communication between a control fluid supply chamber formed in the valve housing and a suction port, and an on-off valve formed by a communication passage forming member having an annular valve seat in an outer periphery of the CS communication passage and an on-off valve element biased in the valve closing direction with respect to the valve seat.

A variable displacement swash compressor includes a housing, a drive shaft, a swash plate, a link mechanism, a piston, a conversion mechanism, an actuator, and a control mechanism. The swash plate is rotatable together with the drive shaft in a swash plate chamber. The conversion mechanism reciprocates the piston in a cylinder bore. The actuator is operative to change the inclination angle of the swash plate. The actuator is rotatable integrally with the drive shaft. The actuator includes a partitioning body, a movable body, and a control pressure chamber. The control mechanism changes the pressure of the control pressure chamber to move the movable body. The movable body and the link mechanism are located at opposite sides of the swash plate.

In a compressor of the present invention, a first acting portion and a second acting portion are formed at a rear end of a first cylinder portion of a movable body. The first and the second acting portions are formed by stepping across a top dead center surface, and are plane-symmetrical with respect to the top dead center surface. Further, an affected portion is formed on a front surface of a swash plate. The first and the second acting portions and the affected portion are located eccentrically to a top dead center position corresponding portion side from a drive shaft axis.

A displacement control valve includes a valve housing, a valve element fitted in a guide passage of the valve housing, and a solenoid for driving the valve element to open and close it, a tapered portion is provided at one of an outer peripheral surface of the valve element and a guide surface of the guide passage, and a spiral groove is provided in the other, wherein the tapered portion is set such that a gap between the valve element and the guide passage is larger toward the low-pressure side than on the high-pressure side, and the tapered portion and the spiral groove are provided such that a starting point of the tapered portion is located within the region of the spiral groove in the entire range between the starting point and the ending point of the stroke of the valve element.

A control valve for discharging a liquid refrigerant in a control chamber at the time of start-up of a variable capacity compressor has a movable a center post for increasing the area of a passage for discharging the liquid refrigerant when discharging the liquid refrigerant.

A capacity control valve includes a valve housing provided with a main valve seat; a main valve body that is inserted into the valve housing and includes a main valve portion which is capable of seating on the main valve seat 10a to open and close a communication between a suction port and a control port using a driving force of a solenoid; and a pressure-sensitive body that applies a biasing force to the main valve body in an opening direction according to pressure of a fluid surrounding the pressure-sensitive body. The fluid is supplied from the control port to around the pressure-sensitive body, and the fluid is supplied from the suction port to a back pressure side of the main valve body.

A control valve according to an exemplary embodiment includes an interlocking mechanism that achieves a first operation and a second operation simultaneously or continuously. In the first operation, a sub-valve is opened by having an actuating rod displaced integrally with a sub-valve element in accordance with the magnitude of solenoidal force. In the second operation, a load, by which to bias a main valve element in a closing direction of a main valve, is increased by displacing the actuating rod relative to the main valve element.

A variable-capacity compressor control valve is configured for easily regulating the opening degree of an in-valve release passage, and thus can effectively reduce internal circulation of refrigerant within the compressor and effectively improve the operation efficiency of the compressor. An in-valve large-opening release passage with a relatively large opening degree, which is used during the compressor actuation time, and an in-valve small-opening release passage with a relatively small opening degree, which is used during both the compressor actuation time and the normal control time (i.e., Pd.fwdarw.Pc control time), are formed using different passages.

A variable displacement type swash plate compressor includes a housing having therein a swash plate chamber and a plurality of cylinder bores, a drive shaft, a swash plate, a link mechanism, and a plurality of the pistons. The compressor further includes a partition member, a movable member, and a control pressure chamber, and a control mechanism. First and second seal members are disposed between the partition member and the movable member and between the drive shaft and the movable member, respectively, and are elastically deformed to provide sealing between the control pressure chamber and the swash plate chamber. At least one of a clearance formed between the partition member and the movable member and a clearance formed between the drive shaft and the movable member when the swash plate is at its minimum inclination angle is greater than when the swash plate at a maximum inclination angle position.

An electromagnetically actuatable proportional valve (1), in particular differential pressure valve for use in CO.sub.2 air conditioning compressor arrangements, comprising an electromagnetic actuator (3) for adjusting a valve body (2) relative to a valve seat (5), wherein the valve seat (5) is assigned a first pressure connection (7), via which a fluid can flow bypassing the valve body (2) to a second pressure connection (9), wherein the valve body (2) delimits a diffuser chamber (30) which with the valve body (2) lying against the valve seat (5) is connected in a fluid-conducting manner with the first pressure connection (7) via a fluid connection (22) delimited by the valve body (2).