| 摘要 |
A valve installed in a sewer pipe or drain pipe extending from a house or other building to a street sewer pipe or the like which will automatically close when sewage backs up from the street sewer pipe toward the house or building structure thereby preventing back flow from the sewer pipe into the house thereby protecting the basement or other lower portions of the house or building structure from becoming flooded due to sewer backup. The valve is motor actuated and includes a vertically reciprocal gate controlled by a float operated switch structure disposed downstream of the valve to quickly and positively move the valve to fully closed position upon flood conditions existing in the lateral sewer pipe downstream of the valve thereby preventing back flow and flood conditions occurring on the house side or upstream of the valve. A motor operated pump and chopper unit communicates with the sewer pipe on the house side of the valve and discharges through a bypass line with a one-way flap valve therein to the street side of the valve in order to pump sewage around the valve when it is closed thereby enabling sewage to be discharged from the house side of the valve to the street side of the valve even when the gate valve is closed thereby enabling normal operation of the facilities in the house or other building which discharge sewage into the sewer line.
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