When the pump shuts off, gravity wants the water that is in the discharge pipe to fall back into the pit. The check valve is there to prevent that from happening. The check valve prevents the pump from having to re-pump that water out which could result in short cycling.
Can I put a check valve on sump pump?
A check valve prevents water from running back down into your sump pump after draining it. To install a check valve, you’ll need the valve, 2 PVC couplings, 2 PVC nuts, PVC cement with an applicator, and a hacksaw. Make sure your valve is the same diameter as your drainage pipe to ensure it fits right.
What happens when sump pump check valve fails?
When a check valve is not installed on your sump pump’s discharge line, a back flow of water can cause the pump impeller to rotate backwards and unscrew off the motor shaft. If this occurs, the motor in your sump pump will sound like it is running but it will not be pumping any water out the discharge line.
Can you have 2 check valves on a sump pump?
So with two check valves in parallel, you protect against the stuck-closed scenario (as it is unlikely that both check valves will fail in the same manner), but are actually more likely to have a stuck-open fault, since if either check valve fails open the discharge water can flow back into the sump well.
Where should a check valve be installed?
The check valve must be installed at the outlet of the pump and in front of the outlet control valve for maintenance. Generally, the first outlet of the pump is the soft connection (shock absorber), the next is the check valve, and then the block valve.
Is a check valve necessary?
Check valves are an important component of every submersible pump water system. Why are check valves important? First, they allow your water system to maintain pressure when the pump shuts off. They also prevent backspin, up thrust and help minimize water hammer (more on this later!).
How often should a sump pump check valve be replaced?
On average, sump pumps need to be replaced every 7 to 10 years.
Why is my sump pump check valve so loud?
If you hear a loud noise every time you pump stops, you have a Standard Check Valve installed. That noise is the check valve closing which creates a slamming effect when the water flow reverses in the discharge pipe after the pump stops.
How do you know if a check valve is bad?
Symptoms of a Failing Check Valve
For example, failing check valves will start to vibrate and even lose some internal parts when problems begin to arise. Other symptoms of check valve failure include reverse flow and excessive component wear and damage. Check valves will also emit noises as they start to break down.
How much does it cost to replace a sump pump check valve?
The average cost to replace a sump pump check valve is $15 to $30 for just the parts. A check valve is installed to prevent water from flowing back into your sump basin when your pump is off.
How do I know if my check valve is bad on my sump pump?
How to Know If You Have Check Valve Failure
It Is Taking Longer Than Usual to Discharge the Water.Check for Leaks or Moisture on Seals, Connection & Valve.Fill the Pit With 1/4 to 1/2 of Water and See If it Drains.Look Out for Water Running Back Down During Rain.
Can two sump pumps use the same discharge pipe?
Two pumps discharging into one pipe can restrict water flow. The third reason is that when both the standard electric sump pump and the emergency backup need to run simultaneously, they will be putting two pumps worth of water into only one pipe.
Do all submersible well pumps have check valves?
The check valve will help your water system maintain pressure when the pump shuts off and also prevent backspin, upthrust, and water hammer. It is recommended that at least one check be installed in all submersible well pump installations. Many well pumps have built-in check valves.
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