Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-09-27
1992-08-04
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
13754317, 220203, F16K 1502
Patent
active
051350246
ABSTRACT:
A pressure relief or rollover valve is utilized on the tank of a fuel delivery truck to vent or relieve an abnormal internal pressure within the tank, such as that generated by an accidental deformation of the tank wall, while preventing spillage of fuel during the venting. A tubular valve housing is mounted in the top of the tank with a cover at the exterior of the tank releasably locked in sealed engagement with the upper end of a passage through the housing which opens at its lower end into the tank interior. A valve plate within the housing is biased downwardly to a valve closed position against an upwardly facing valve seat in the passage by springs engaged between the closed cover and the valve plate. A flexible bladder is sealed to the bottom of the cover to define an air chamber sealed from the passage, and openings through the cover vent this air chamber to atmosphere. A shield plate rests on the top of the cover to overlie the vent openings.
REFERENCES:
patent: 4768675 (1988-09-01), Coleman
"Round Manhole With Hatch" Sales Brochure, Liquip Sales Pty., Ltd. pp. 3/1-3/2, 1983.
Oil Equipment Fittings Catalog No. 89 Brochure, Clay and Bailey Mfg. Co. p. 49 (Undated).
Custom Fabrication Brochure For Manholes and Vents, Tiona Betts, Inc. Warren, Pa. (Undated).
NFPA Compliance Manholes, Knappco, Kansas City, Mo. p. 13 (Undated).
PPV Pressure Vacuum Vent For MC306 Tank Vehicles, Tiona Betts, Inc. Warren, Pa. (Undated).
Johnson Bruce R.
LeBlanc Leo J.
EBW, Inc.
Nilson Robert G.
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