| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability in a check valve.SOLUTION: A valve body 52 and a seating surface 51e are made of resin. Thus, the sealing surface 52s is prevented, as compared with the case that the seating surface 51e is made of metal for example, from being worn out even if the sealing surface 52s and the seating surface 51e repeatedly abut with each other. Also, a valve seat member 51 and a case 53 are thermally welded so that, as compared with the case that the valve seat member 51 and the case 53 are assembled by mutual engagement or press fit for example, a fall-off load increases, thus strengthening the fixation between the valve seat member 51 to the case 53. As a result, the durability in the check valve 50 is improved. |
