| 摘要 |
PROBLEM TO BE SOLVED: To certainly prevent falling down of a check valve system stored in an union socket of a check valve with the union socket, and to facilitate manual inserting and ejecting of a snap ring for preventing without using a special tool such as an exclusive tool. SOLUTION: A check valve system stored in a predetermined position of a cylindrical union socket is prevented from falling down by a snap ring 1 locked to an inserting side thereof. The snap ring 1 is composed of a ring-shaped member of a thin plate having an opening portion 25, and by narrowing the opening portion 25, the diameter of the snap ring 1 is easily reduced to enable inserting and ejecting simply by hands. A hook and the like is locked to a locking recess groove 26, which extremely facilitates reducing the diameter.
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