| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure for excellently attaching and fixing a check valve body to drain piping in a flexible check valve. <P>SOLUTION: For the check valve arranged in a flow path of the drain piping, the check valve includes: a check valve body 1 composed of a flexible material and having a body part 2 in a roughly cylindrical shape whose end on the upstream side is opened and end on the downstream side is provided with a closing part 4 to be closed when there is no load, and a flange part 5 provided on an opening part side of the body part 2; a first ring body 6 composed of a hard material to abut on the inner peripheral surface of the opening; and a second ring body 7 composed of the hard material to abut on the outer peripheral surface of the opening. The periphery of the opening is held by the first ring body 6 and the second ring body 7, and the flange part 5 abuts on the upper surface of one or both of the first ring body 6 and the second ring body 7 to prevent detachment of the check valve body 1 from the first ring body 6 and the second ring body 7. <P>COPYRIGHT: (C)2012,JPO&INPIT |
