Patent ID: 6860294

Claim:
A four-way switching valve including a first plug and a second plug arranged in a first cylinder and a second cylinder formed in a body in parallel with each other, respectively, such that the first plug and the second plug are capable of axial reciprocating motion, the first plug and the second plug each having axially both ends forming valve elements and performing switching of fluid passages, a first piston and a second piston for actuating the first plug and the second plug, respectively, and a three-way solenoid valve causing a pressure control chamber for the first piston to be selectively communicated with a space into which high-pressure fluid is introduced or a space into which low-pressure fluid is introduced, characterized in that: the three-way solenoid valve comprises: a first valve element and a second valve element arranged in an axial direction of a plunger as respective two separate parts, for reciprocating motion; a first valve seat having a guide for guiding said first valve element and a valve hole concentric with said guide both arranged at respective axial positions of the plunger; and a second valve seat having a guide for guiding said second valve element and a valve hole concentric with said guide both arranged at respective axial positions of the plunger.