New check valve for sump pump leaks - OK?

I replaced my sump pump, including the check valve. With the new pump, the system made a lot more noise, like water flushing. I checked and discovered that the new check valve leaks - it lets the water go both ways. I disconnected the output pipe a few feet above the valve, on the output side. (Interestingly, the pipe was empty when I disconnected it. I poured water in the output end of the pipe, and it ran out of the input openings on the pump. I poured water into the output side of the valve directly, and it ran out the other end immediately. I was careful to be sure the valve wasn't backwards.
I checked the old valve, which is similar. It leaked, too. I checked a third valve with a different design, and it didn't leak.
The new valve has the brand name Parts2O Sump Pump Check Valve FP0026-6D. It's black plastic, about five inches long. It looks like some kind of adapter, with one end threaded and the other unthreaded. Each end fits two or more different diameters. In my case, it screws directly into the sump pump. It has a rubber flapper inside, which is open a little even with no pressure.
Is a leak like this OK? I can see how the valve might close if there was more pressure behind it.
Thanks.
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Might be the parameters of your valve don't quite match the system. If so, it would be logical to experiment with a different design or two to find a more effective set up. Your third valve sounds like the best candidate.
Joe
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If it's OK, then what would the point to having a check valve be? It's only there to stop water flowing back into the sump pit when the pump shuts off. If water runs through it as you describe, then it's useless. How important a check valve is depends on the discharge line length and routing. In some installs, not much water can run back in anyhow, so it's less important. In others a lot of water can run back in.
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I'll get a check valve that works. Thanks.
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