| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the durability of a stopper pipe by fixing the stopper pipe to one of the high pressure and low pressure side ports of a valve seat plate and then plastic-deforming the pipe to be hardened when assembling a main valve rotation regulating section for regulating the rotation displacing range of a valve element between two rotating positions. SOLUTION: A rotary type flow switching valve is constructed as a 4-way valve 100 used for a heat pump system, and a main valve element 3 is fitted so as to be rotational displaced between a first and a second rotating positions around a center axis and displaced up and down in an axial direction. The joint pipe 17 of a high pressure side port 19 penetrates the high pressure side port 19 to be protruded in a high pressure side communication groove 37, and this protruded part is used as a stopper pipe 20 contacted with both ends of the arc-shaped communication groove 37. In this case, for the stopper pipe 20, the joint pipe 17 is soldered to the high pressure side port 19, then cold plastic deforming work is carried out and, by performing hardening, durability is increased.</p> |
