Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1989-06-22
1991-04-09
Walton, George L.
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
137433, 4287, 251 85, 251 87, F16K 3122, F16K 2500
Patent
active
050056034
ABSTRACT:
A retrofittable drain insert for existing bell shaped traps and other type drains is provided. The drain insert enables an existing bell trap or pipe drain to be modified and upgraded easily by not only preventing the backflow of sewer gases but also by substantially reducing the backflow of fluid through the drain into the drained area. The drain insert includes a housing with a valve means suspended by an expandable suspension means which easily fits into and can be mounted within the existing drain opening. The valve means has a larger diameter than the housing so as to form a gas tight and fluid tight seal, however, it has a smaller diameter than the existing drain opening so as easily to be retrofittable and fit therein.
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Amundson Eric K.
Manners Herbert C.
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