To produce a seal mounting groove simply and easily in a construction site even when the seal mounting groove does not exist in any of annular connecting surfaces of both connecting flanges.
Both connecting flanges 2-3 equipped with smoothly flat annular contacting surfaces 2a-3a, which are formed at ends of both duct constitution members 2-3 and can be contacted flatly in conduit axis direction, are connected and fastened with a fastener 4 in such a condition that an annular gasket 6 is interposed between the annular contacting surfaces 2a-3a, an inner side ring 9, which constructs an inner side circumferential wall surface at a radial inner side of annular seal mounting groove 8 for mounting the gasket 6, and an outer side ring 10, which constructs an outer side circumferential wall surface at a radial outer side of the seal mounting groove 8, are arranged between the annular contacting surfaces 2a-3a of the both connecting flanges 2-3, and a position holding means A, which holds at least one of the inner side ring 9 and an outer side ring 10 at a setting circumferential wall forming position of the seal mounting groove 8, is provided.
MAENISHI TAMOTSU
MORI MITSUHIRO
| JP2003294145A | 2003-10-15 | |||
| JP3136954U | 2007-11-08 | |||
| JP2009270636A | 2009-11-19 | |||
| JPH0398362U | 1991-10-11 | |||
| JPH09257131A | 1997-09-30 | |||
| JP2000120953A | 2000-04-28 | |||
| JP2004019832A | 2004-01-22 |
Kunihiko Higashi
Nakajo Hitoshi