Fluid handling – Line condition change responsive valves – Pop valves
Patent
1983-08-17
1985-02-12
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Pop valves
1374936, 220203, 220303, F16K 17196
Patent
active
044984936
ABSTRACT:
A pressure/vacuum valve assembly for a fuel tank filler neck comprises a pressure-release valve member, a vacuum-relief valve, and a pressure-release control member in a vent passageway. The vent passageway has an axially outwardly facing surface and a radially inwardly facing surface. A yieldable control spring urges the pressure-release valve member normally to close and seal the vent passageway. The pressure-release control member has an axially inwardly facing surface which forms a first restricted opening for the flow of fuel vapors. The control member has a radially outwardly facing surface which forms a second restricted opening with the radially inwardly facing surface of the vent passageway. The pressure-release valve member is urged in opposition to the control spring to open the vent passageway in response to a predetermined superatmospheric pressure and allow fuel vapor to flow in the first and second restricted openings. A relatively small increase in pressure in the restricted opening produces a large force against surfaces of both the pressure-release valve member and the pressure-release control member in opposition to the control spring to rapidly increase the flow of fuel vapor through the vent passageway. The combined surfaces of both the valve member and control member is about 350% greater than the surface of the valve member which is initially exposed to the vapor pressure.
REFERENCES:
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patent: 2295931 (1942-09-01), Caminez
patent: 2401237 (1946-05-01), Gamble
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patent: 4011848 (1977-03-01), Coddington
patent: 4046163 (1977-09-01), Novak
patent: 4091955 (1978-05-01), Sloan, Sr.
patent: 4133346 (1979-01-01), Smith et al.
patent: 4142549 (1979-03-01), Autry
Nilson Robert G.
Stant Inc.
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