F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/8
F16K 17/36 (2006.01) B65D 90/34 (2006.01) F16K 17/196 (2006.01)
Patent
CA 1238835
PRESSURE AND VACUUM RELIEF VALVE MECHANISM FOR A FLUID STORAGE TANK ABSTRACT OF THE DISCLOSURE A pressure and vacuum relief valve mechanism which can be installed in a vent opening in the top wall of a fluid storage tank. The valve mechanism includes a valve housing with a central bore therethrough. One end of the bore communicates with the vent opening to ambient atmosphere and the opposing end communicates with the interior of the tank above the stored fluid. A single, integral valve member is movable in the bore of the housing. The valve member has a plurality of valve seats formed thereon and valve operable closure means cooperably engaged respectively with the valve seats. There is a valve seat and closure means for relieving excessive pressure and a valve seat and closure means for relieving excessive vacuum in said tank interior, these valving arrangements normally being biased closed. There is a third overturn valve seat and cooperable valve closure means normally operable to maintain this valving arrangement open but operable to close the same when the tank is tilted or overturned so as to prevent leakage of stored fluid through the vent opening. -1-
495689
Borden Ladner Gervais Llp
Kccb Inc.
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