| 摘要 |
PROBLEM TO BE SOLVED: To provide a jet nozzle capable of reliably preventing leakage of washing liquid. SOLUTION: In a check valve 10, a flange part 74 is formed on the opening end side of a movable cylinder 60, an annular groove 80 is formed on the inner periphery of it, and an O-ring 82 is provided. The O-ring 82 abuts on the bottom part of the groove 80 and the outer periphery of a fixed piston 84 to seal a part between the inner periphery of the movable cylinder 60 on the opening end side of the movable cylinder 60 and the outer periphery of the fixed piston 84. The O-ring 82 is not easily deformed even if internal pressure of the movable cylinder 60 rises, and it has rigidity higher than that of the other part of the movable cylinder 60 since the flange part 74 is formed. Therefore, the tensile force of the O-ring 82 is not deteriorated even if internal pressure of the movable cylinder 60 rises, and leakage of washing liquid can be reliably prevented.
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