METHOD OF MANUFACTURING CHANNEL SWITCHING VALVE AND CHANNEL SWITCHING VALVE

摘要

PROBLEM TO BE SOLVED: To provide a method of shortening a heating process to be performed before brazing a valve housing of a channel switching valve, a first type joint pipe and a second type joint pipe.

SOLUTION: The first type joint pipes 3a-3c are assembled to the valve housing 1 by inserting end parts of the first type joint pipes 3a-3c into insertion holes 11a-11c of the valve housing 1 and insertion holes 21a-21c of a valve seat member 2. The second type joint pipe 3d is assembled to the valve housing 1 by inserting an end part of the second type joint pipe 3d into an insertion hole 11d of the valve housing 1. Welding is performed in such a way that fusion fixed layers A1 are formed on corresponding position of the first type joint pipes 3a-3c by applying a laser beam B1 from the outside of the valve housing 1. Welding is performed in such a way that a fusion fixed layer A2 is formed on a corresponding position of the second type joint pipe 3d by applying a laser beam B1 from the outside of the valve housing 1. A temporarily assembled body assembly 10 is heated and brazed without using an implement for assembling having a large heat capacity.

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