| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve device preventing a reverse flow of a fluid caused by pulsation generated by the start and stop of the operation of a fluid pump, or the reciprocating motion of a piston, and enabling the natural circulation of the fluid. SOLUTION: A mushroom like valve having a hemispherical, conical, or spindle shaped cross section in a head is provided in a suction opening. A spring is wound or a stopper is welded to a shaft for securing a moderate space between a head bottom face and a casing inner wall. COPYRIGHT: (C)2006,JPO&NCIPI
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