Can you install two check valves at different heights on a sump pump line?

Yes, you can install two check valves at different heights on a single sump pump line, and it is a recommended practice in certain situations, such as in deep well systems or for added redundancy.

What happens if the check valve height is wrong on a sump pump?

If a check valve is installed too high, water from the discharge pipe will drain back into the sump pit, causing the pump to cycle on and off frequently (short cycling). This can lead to premature wear and failure of the pump.

Which check valve type suits vertical setups at the right height?

For vertical setups, spring-assisted (axial flow or silent) check valves and vertical lift check valves are generally recommended, with spring-assisted valves offering the most flexibility regarding installation height and flow conditions.

How do you know if your check valve is installed backward?

You know your check valve is installed backward because the sump pump will run, but no water leaves the pit. The reversed valve acts like a completely closed barrier, stopping the discharge flow. The pump quickly builds up pressure, overheats, and burns out the motor very fast. One must look for the flow arrow on the valve body; it absolutely needs to point up and away from the pit.

Why does your sump pump run constantly even after you installed a check valve?

Your sump pump runs constantly even after you installed a check valve because a persistent leak exists either inside the valve or within the pump system. The valve itself might not seal fully due to debris caught in the flapper, allowing water to trickle back. Alternatively, the water source entering the pit exceeds the pump's capacity. That continuous running signifies a severe blockage or a broken component, causing inefficiency.

What Height to Install Check Valve on Sump Pump

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