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Leakage detector, a latching solenoid, a flow meter, and a liquid dispensing apparatus including same

  • US 6,502,451 B1
  • Filed: 10/27/2000
  • Issued: 01/07/2003
  • Est. Priority Date: 04/30/1998
  • Status: Active Grant
First Claim
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1. A liquid dispensing apparatus for dispensing a liquid, said apparatus comprising:

  • a flow meter having flow rate detection means;

    a latching solenoid valve operative with the flow meter for metering the liquid being dispensed;

    a leakage detection means for detecting liquid leaking from the liquid dispensing apparatus, the leakage detection means including a diaphragm located radially to a direction of flow of liquid through the liquid dispensing apparatus, a magnet provided on the diaphragm and displaceable by the diaphragm in sympathy with fluctuations in pressure exerted on the diaphragm, and a detection switch actuatable by proximity to the magnet located on the liquid dispensing apparatus for detecting displacement of the magnet towards the detection switch;

    processing means for comparing signals from said flow rate detection means and said leakage detection means; and

    control means for interrupting the flow of liquid, wherein said control means interrupts the flow of liquid when (1) said leakage detection means detects a flow of liquid, and (2) said flow rate detection means does not indicate at least a minimum predetermined flow rate.

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