| 摘要 |
PROBLEM TO BE SOLVED: To provide an easy forming check valve of which weight is made light while its entire body is formed compact, realizing its stable opening or closing operation even under a case that a specific gravity of fluid is low and capable of preventing chattering and provide a method for manufacturing the valve body for the check valve.SOLUTION: This invention relates to a check valve in which a swing valve body 4 is moved toward or away from a valve seat surface 8 inside a body 3 to open/close a channel, the swing valve body 4 is arranged such that a disc-like valve body 20 having a sealable seat surface 22 at the valve seat surface 8 and an arm part 21 to cause the valve body 20 to be swung are separately arranged, a column-like protrusion 23 is formed at the central part at an opposite surface of the seat surface 22 of the valve body 20, an annular edge part is formed at an outer diameter side of the column-like protrusion part 23 and at the same time the column-like protrusion part 23 is inserted into a hole part 31 formed at the arm part 21, the annular edge part is caulked to expand its diameter and pushed out to cause the column-like protrusion part 23 to be engaged with and fixed to a peripheral edge part 32 of the hole part 31. |
