| 摘要 |
The present invention relates to a double expansion joint comprising: an inner expansion joint (10) in which a first flange connection unit (11) and a second flange connection unit (12) are formed at both ends and fluid flows; an outer expansion joint (20) covering the inner expansion joint; first and second flanges (30, 40) in which the first and second flange connection units and both ends of the outer expansion joints are connected and separating the inner expansion joint and the outer expansion joint; and an insulation cotton filled in a gap between the inner expansion joint and the outer expansion joint. |
