Check valve for a leak detector

Details Check valve for a leak detector Check valve for a leak detector

1990-03-20

1990-10-30

Fox, John C.

Fluid handling

Systems

Flow path with serial valves and/or closures

137459, 13761417, F16K 3112

Patent

active

049661906

ABSTRACT:
A check valve for a leak detector used in conjuction with a gasoline dispenser maintains the delivery line under pressure to accelerate translation of the leak detector from the relaxed position through the leak position and to the non leak position unless there is a line leak resulting in flow above a predetermined flow rate. Upon cessation of fuel delivery at the outlet nozzle, the check valve isolates the leak detector from damage due to hydraulic hammer. In the event of leak in the delivery line, the bleed off of pressure locked in by the check valve will permit the leak detector to sense the low pressure when in the leak position and signal the station operator by restricting the flow rate.

REFERENCES:
patent: 1622069 (1927-03-01), Thomson et al.
patent: 3621872 (1971-11-01), Fisher

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