Gas-pressure relief valve unit, particularly for fuel vapors

Details Gas-pressure relief valve unit, particularly for fuel vapors Gas-pressure relief valve unit, particularly for fuel vapors

1998-01-14

1999-07-20

Hepperle, Stephen M.

Fluid handling

Control by change of position or inertia of system

With second control

137 43, 1375133, F16K 1736

Patent

active

059244380

ABSTRACT:
A gas-pressure relief valve unit, particularly for fuel vapours, comprising a body defining a chamber which communicates with first and second environments upstream and downstream of the unit respectively, through first and second apertures. The body is provided with a first and a second assemblies, the first assembly including a valve seat interposed between the apertures and an obturator urged by a resilient thrust element and movable between a position of engagement with the seat and a position spaced from it. The obturator can move away from the valve seat, overcoming the action of the resilient element, when a predetermined threshold value of the pressure differential between the environments is reached. When the obturator is engaged with the seat and the pressure differential between the environments is less than the predetermined threshold value, the valve means define a narrow passage which allows a small, continuous flow of gas between the first and second environments.

REFERENCES:
patent: 2860656 (1958-11-01), Eshbaugh
patent: 3036594 (1962-05-01), Salisbury
patent: 3756273 (1973-09-01), Hengesbach
patent: 4646772 (1987-03-01), Bergsma
patent: 4760858 (1988-08-01), Szalaga
patent: 5004002 (1991-04-01), Kobayashi
patent: 5028244 (1991-07-01), Szlaga
patent: 5065782 (1991-11-01), Szlaga
patent: 5156178 (1992-10-01), Harris
patent: 5261439 (1993-11-01), Harris
patent: 5449018 (1995-09-01), Harris

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