Abstract: There is provided a very reliable three-way solenoid valve that can reliably switch a refrigerant flow passage while ensuring a refrigerant flow rate even under a large-differential pressure environment without increasing the size of an electromagnetic coil and the like. A valve body includes a conduction hole that communicates with a back pressure chamber formed on a side of a second valve element opposite to a second valve seat, a third valve seat that is positioned between the conduction hole and a second outlet, a third valve element that is movably disposed so as to approach and be separated from the third valve seat, a coil spring that biases the third valve element toward the third valve seat, and actuating rods that are interposed between a first valve element and the third valve element.

Abstract: There is provided a very reliable three-way solenoid valve that can reliably switch a refrigerant flow passage while ensuring a refrigerant flow rate even under a large-differential pressure environment without increasing the size of an electromagnetic coil and the like. A valve body includes a conduction hole that communicates with a back pressure chamber formed on a side of a second valve element opposite to a second valve seat, a third valve seat that is positioned between the conduction hole and a second outlet, a third valve element that is movably disposed so as to approach and be separated from the third valve seat, a coil spring that biases the third valve element toward the third valve seat, and actuating rods that are interposed between a first valve element and the third valve element.

Abstract: There is provided a two-stage pilot solenoid valve of which the size is reduced as a whole and which is excellent in mountability. A first valve element, which is slidably fitted to a first valve chest, is movable in a direction different from upward/downward moving directions of a valve stem, which is provided with a second valve element, and a pilot valve element that is driven so as to be opened and closed according to upward/downward movement of the valve stem.

Abstract: A power drive unit is configured to comprise a heat sink, a power module pressed by a press member to the heat sink to be fastened thereto and a spring member that has a substantially circular shape and is installed between the power module and the press member. With this, the power module can be fastened to the heat sink without incurring layout limitation, degradation of heat release performance and the like. Also, since the power drive unit further includes a projection that protrudes from the press member to be engaged with an engagement hole bored at the center of the spring member, engagement of the projection of the press member with the engagement hole of the spring member functions to prevent displacement of the press member relative to the spring member, thereby making loads acting on the power modules uniform.

Abstract: A power drive unit is configured to comprise a heat sink, a power module pressed by a press member to the heat sink to be fastened thereto and a spring member that has a substantially circular shape and is installed between the power module and the press member. With this, the power module can be fastened to the heat sink without incurring layout limitation, degradation of heat release performance and the like. Also, since the power drive unit further includes a projection that protrudes from the press member to be engaged with an engagement hole bored at the center of the spring member, engagement of the projection of the press member with the engagement hole of the spring member functions to prevent displacement of the press member relative to the spring member, thereby making loads acting on the power modules uniform.