| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a check valve which keeps a mold structure simple and furthermore which allows a productivity to be improved and a water stop performance to be improved, and to provide a method of manufacturing the same. <P>SOLUTION: The subject method is a method of manufacturing a tubular check valve having a water stop section 13 which leaves the upstream side opened and the downstream side opened/closed, including: forming the water stop section 13 of the check valve in a closed fashion to be integral; and cutting open the water stop section 13 that remains closed by moving a cutting means 2 (a blade 21, a laser light beam, or a water jet cutting process) to a side direction with respect to an axial direction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
