To positively achieve a specific flowing water detection function without any risk of water leakage when using a device under a high internal pressure condition.
In a flowing water detector 1, a flowing water detection path 10 with a longer diameter toward the side of a flow-out port 8 is formed between a flow-in port of a primary side and the flow-out port 8 of a secondary side, a float body 14 for allowing flowing water while moving toward a secondary side along the direction of its flow line in the flowing water detection path 10 due to a water pressure difference accompanied by the reduction in a secondary side water pressure P1 as compared with a primary side water pressure P1 by breaking the flowing water detection path 10 when the primary side water pressure P1 is equal to the secondary side water pressure P2 is installed in the flowinf water detection path 10, and a flowing water detection means 17 for detecting a flowing water state by magnetically detecting a position in the flowing water detection path 10 of the float body 14 is provided.
SONODA MASABUMI
HIRASAWA MASAYUKI
TANAKA NORIAKI
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