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Sump pumps

Sump pumps are normally electrically powered utilizing water level sensors to activate electric motor driven pumps. Because sump pumps are most frequently called upon during and immediately after storms, electric service may not be available throughout the time period in which the pump is required to act. While it has been known to provide battery backup systems to supply electric power during power outages, such backup systems are quickly drawn down, are difficult to maintain at optimum charge and require periodic replacement of the batteries.
It has been proposed to utilize water-powered pumping systems where a connection to a water supply, such as a municipal water system, may be available to provide an uninterrupted pressured flow even during times of electrical outage. Such devices may include venturi devices or turbine vane pumps.
While such devices may work during periods of electrical outage, they are relatively inefficient, having small pumping capacities in comparison to the volumes of water required, may have small operating heads, and provide back flow contamination problems, particularly in those situations, such as venturi devices, where the high-pressure water, generally potable water, mixes directly with the gray water from the sump.
It therefore would be an advance in the art to provide a non-electrically driven sump pump having relatively higher efficiencies than current water-powered sump pumps.
It would be a further advance in the art to provide a relatively high efficiency water-powered positive displacement sump pump which avoids back flow problems.
It would be a further advance in the art to provide a water-powered sump pump utilizing a reciprocating positive displacement pump having a pumping chamber submerged in the sump with a drive chamber connected to a pressure water supply, the drive chamber spaced from the pumping chamber and employing a reversing valve to reciprocate the positive displacement pump.