FLOW CHANNEL SWITCHING VALVE AND HEAT PUMP SYSTEM

摘要

A flow channel switching valve is provided with: a first circulating section; a second circulating section that is in communication with the first circulating section; a third circulating section; a fourth circulating section that is in communication with the second circulating section via an external circuit or with the third circulating section and that has an orifice structure; and an on-off valve for switching the state of communication between the first circulating section and the third circulating section.