I have a municipal water-powered sump pump that acts as a backup in the case of a power outage. However, the valve (a black plastic arm extending from the water line that holds a string with a float, feeding a garden hose that goes down to the pump housing) appears damaged and leaks a lot, so I'd like to replace it. I've been unable to find something that looks similar. All other float valves I've been able to find are intended for filling tanks, where a high water level shuts off the water flow, whereas I want the inverse behavior: maximum flow when the water level rises. Can I turn one of those upside-down or something that would give me the desired behavior?
I'd appreciate any suggestions for suitable float valve configurations I could use. In case it matters, I'm in Michigan, USA.
Edit: The water-powered sump pump looks very similar to this K2 Pumps model, and the part of interest is labelled "pump starting valve" at the bottom of page 6 of their manual.