| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a check valve member having an elastic check valve body which can be connected to each of pipe bodies having various pipe diameters.SOLUTION: A check valve member is comprised of a check valve part 2, a lamination type connection 3a, and the like. The check valve part 2 is a cylindrical body made of an elastic raw material and has an opening at an upstream side end, and a downstream side end thereof consists of a closing part 2a which is closed by opposing surfaces abutting on each other. The lamination type connection 3a includes a connection provided on one or both of the upstream and downstream sides of the check valve part 2 and can be connected to one of pipe bodies having a plurality of diameters. The connection consists of a plurality of annular parts 4 having different diameters and at least one of the annular parts 4 is inscribed with the pipe body when connected, the annular part 4 of a smaller diameter is arranged on the further inside of the annular part 4 of a larger diameter when viewed in the axial direction, and the plurality of annular parts 4 are connected by shifting in the axial direction such that the diameters of the annular parts 4 are reduced as the annular parts come closer to the check valve part 2 in cross-section view.</p> |
