Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1994-01-04
1995-09-12
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
137 43, 137859, 220746, F16K 17196
Patent
active
054490189
ABSTRACT:
An apparatus is provided for controlling venting of fuel vapors from a vehicle fuel tank. The apparatus includes a housing having an inlet receiving fuel vapor from the fuel tank and an outlet discharging vapor to a vapor treatment device and a valve having a central portion and an outer annular portion. The valve is movable in the housing and cooperates therewith to define a first vent chamber communicating with the fuel tank and a second vent chamber communicating with the vapor treatment device. A first vent opening is formed in the central portion of the valve. The apparatus also includes a member partitioning the first vent chamber into a central region exposed to pressure from the second vent chamber and an outer annular region exposed to pressure from the inlet. A spring normally biases the valve into engagement with the partitioning member to block flow of fuel vapor from the outer annular region of first vent chamber through the first vent opening to the second vent chamber.
REFERENCES:
patent: 3827456 (1974-08-01), Sheppard
patent: 3929158 (1975-12-01), Rodgers
patent: 4113300 (1978-09-01), Schenk
patent: 4760858 (1988-08-01), Szlaga
patent: 4953583 (1990-09-01), Szlaga
patent: 5099880 (1992-03-01), Szlaga et al.
patent: 5156178 (1992-10-01), Harris
Nilson Robert G.
Stant Manufacturing Inc.
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