| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe coupling structure to prevent the occurrence of positional displacement and a biasing even when vibration is exerted during conveyance at an assembly process, prevent the occurrence of the biasing of a clearance between an insertion hole and a pipe, prevent the occurrence of defective leakage after brazing, and be excellent in assembly ability and reliability. SOLUTION: In a pipe coupling structure wherein a coupling pipe is inserted in a low pressure port 15 formed in a valve seat plate 5 and a coupling pipe 13 is fixed at a valve seat plate 5 by brazing, a plurality of at least three small protrusions 81 are molded in a protrusion state on the outer peripheral surface in the vicinity of the insertion end of the coupling pipe 13. The coupling pipe 13 pressed fitted in the low pressure port 15 by the small protrusion 81, and the coupling pipe 13 is fixed at the low pressure port 15 through brazing of the whole periphery of a pipe.
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