| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water diaphragm having improved durability to hot water and reduced heat deterioration due to operating oil without causing layer-to-layer separation even when subjected to repetitive dynamic deformation. SOLUTION: The hot water diaphragm is operated with the operating oil for feeding hot water. It comprises a first rubber layer 14 for contacting the operating oil, a second rubber layer 12 for contacting the hot water, and at least one of fiber layers (16, 18, 20) laminated between the first rubber layer 14 and the second rubber layer 12. The first rubber layer 14 is formed of NBR having an acrylonitrile content of 31-42% for improved heat resistance aging property, and the second rubber layer 12 is formed of NBR having an acrylonitrile content of 31-42% for improved water resisting property. COPYRIGHT: (C)2006,JPO&NCIPI
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