Pressure difference detector, a method for judging an abnormalit

Details Pressure difference detector, a method for judging an abnormalit Pressure difference detector, a method for judging an abnormalit

1994-07-12

1995-05-30

Raevis, Robert

Measuring and testing

With fluid pressure

Leakage

73707, G01M 308

Patent

active

054191823

ABSTRACT:
A pressure difference detector for detecting a pressure difference between atmospheric pressure and a fuel system vapor pressure to be measured, includes a pressure dampening member 17a for dampening the flow of atmospheric air between an introducing inlet 11a and a reference pressure chamber 12 to limit the air flow rate to a value smaller than a leakage flow rate between the chamber and a fuel system vapor pressure introducing inlet 11b due to a leaking 0 ring seal. This prevents an erroneous judgment that the fuel system is leaking.

REFERENCES:
patent: 3533293 (1970-10-01), Puckett
patent: 4452069 (1984-06-01), Hattori et al.
patent: 4668889 (1987-05-01), Adams
patent: 5275054 (1994-01-01), Park

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