A constantly running sump pump can be frustrating, not to mention expensive in terms of electricity and wear on your pump. If your sump pump seems to be “short cycling,” the culprit is often a faulty check valve.
This one-way valve is a small but crucial component that stops water from flowing back into the sump pit after it has been pumped out.
Understanding how it works and what to do when it fails can save you money and prevent costly water damage.
How The Check Valve Works
A sump pump check valve is installed on the discharge pipe. It features a flap or spring-assisted mechanism that opens when the pump pushes water out and closes immediately to prevent backflow.
This ensures that water doesn’t return to the pit and trigger the pump to run again unnecessarily.
Common Check Valve Problems
Backflow
When the check valve fails to seal properly, the water in the discharge pipe drains back into the sump pit. This raises the water level, causing the pump to cycle repeatedly.
Debris Build-Up
Sediment or debris can lodge in the valve flap, preventing it from closing fully and allowing water to flow backward.
Wear and Tear
Frequent use over time can cause the valve components to wear out, reducing its effectiveness.
Improper Installation
Installing the valve backward, which is easy to do if the arrow is ignored, will prevent proper water flow and can render the pump nearly useless.
Preparing For Check Valve Repair
Unplug The Pump
Always disconnect your sump pump from power before working on it to prevent electrical accidents.
Drain The Pit
Let the pump run one last time or use a tool to push up the flap to clear any remaining water in the discharge pipe.
Prepare For Spillage
Keep a bucket or wet/dry shop vacuum nearby, as some water will spill when removing the valve.
How To Replace A Sump Pump Check Valve
Remove The Old Valve
Locate the cylindrical check valve on the discharge pipe and remove it. Depending on your system, you may need to loosen hose clamps or cut the PVC pipe.
Purchase The Right Replacement
Ensure the new valve matches your pipe size, usually 1 1/4 or 1 1/2 inches, and consider a quiet, spring-assisted model to reduce water hammer noise.
Install The New Valve
Follow the arrow direction for correct water flow, and secure the connections using clamps or PVC cement.
Test The Installation
Plug the pump back in and pour water into the pit. Watch for leaks and ensure the pump shuts off correctly without water cycling back.
For expert sump pump repairs and maintenance in Los Angeles, trust Adeedo Drains, Plumbing, Heating, & Air.
