E - Fixed Constructions – 03 – F
Patent
E - Fixed Constructions
03
F
E03F 7/06 (2006.01) E03F 7/04 (2006.01)
Patent
CA 2052084
A back water valve system to be installed at the entrance of the city sewer system into a dwelling eliminates a series of secondary conventional back water valves. The valve system includes a one-way check valve and an opening thereabove partly obstructed by a screen for allowing for free circulation of sewer gases through the valve system. The screen prevents the entrance into the dwelling of small animals such as rats from the city sewer system. A pair of upper flappers each provided with a float are pivotally mounted on the dwelling side and on the city sewer side of the opening. Therefore, the one-way check valve prevents spillage into the dwelling of sewer back-ups. The upper flapper on the city sewer side is adapted to close the opening and its screen also upon sewer back-ups to prevent spillage on the dwelling side of the valve system and also to prevent fouling of the screen. The flapper located on the dwelling side of the opening is adapted to close the opening and its screen when there is a sufficient flow of waste water coming from the dwelling for preventing fouling of the screen. Therefore, the opening and its screen allow for free passage of the sewer gases while protecting the dwelling against intrusion of rats or other pests. The one-way check valve includes a double-hinge flapper which is normally closed and protects the dwelling against sewer back-ups while facilitating the use of fish wires when cleaning the valve system.
Pludowski Robert
Swabey Ogilvy Renault
LandOfFree
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