To prevent deformation of a header and breakage thereof resulting from the deformation even when pressure in a filtration module is high.
A fixing nut 4 has a deformation preventing part 41a for preventing the deformation of the header 3 under a condition where internal pressure of the filtration module 1 exceeds atmospheric pressure. The deformation preventing part 41a presses at least a part of a pressure projection part in which the internal pressure of the filtration module 1 acts in an axial direction in the header 3. In the pressure projection part, a ratio S2/S1 of a projection area S2 of a press part pressed by the deformation preventing part 41a to a projection area S1 of a non-press part not pressed by the deformation preventing part is within a range between 25 and 300%.
IWAMOTO KENTARO
| JPS53135891A | 1978-11-27 | |||
| JPH0281624U | 1990-06-25 | |||
| JPS57169401U | 1982-10-25 | |||
| JPS5415397A | 1979-02-05 | |||
| JPS57180405A | 1982-11-06 |
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
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