The check valve on a sump pump is installed on the discharge pipe, specifically 6" above the pump discharge.
When setting up a sump pump system, the proper placement of the check valve is crucial for efficient and reliable operation. According to the provided reference, you should install the check valve on the discharge pipe that carries water away from the pump.
Why Placement Matters: 6 Inches Above the Discharge
The reference specifies placing the check valve 6" above the pump discharge when the pump is installed inside the sump basin. This seemingly precise measurement serves a practical purpose related to preventing air lock.
Here's a breakdown:
- Location: On the discharge pipe connected to the pump.
- Height: Approximately 6 inches above the point where the pipe exits the pump.
Function and Benefits of This Placement
This specific placement allows for the drilling of air release holes or weep holes in the discharge pipe below the check valve but above the pump's discharge outlet.
- Air Lock Prevention: Sump pumps can sometimes get air locked, where air trapped in the pump or discharge pipe prevents water from being pumped out. Weep holes relieve this trapped air.
- Protection: By placing the check valve above the weep holes, it ensures that water draining back down the pipe (after the pump shuts off) goes out the weep holes back into the sump basin instead of potentially bypassing the air lock mechanism below the valve.
- For Specific Pumps: This setup is particularly important for sump pumps that do not have a built-in system for air lock prevention.
Summary of Check Valve Placement
| Component | Location | Reason |
|---|---|---|
| Check Valve | On the discharge pipe | Prevents water from flowing back into the sump basin after pump cycles. |
| Specific Height | 6" above the pump discharge (within the basin) | Allows for strategic placement of weep holes below the valve. |
| Weep Holes | In the discharge pipe, below the check valve | Relieves trapped air to prevent air lock, directing water back to basin. |
Installing the check valve correctly at this height ensures that the weep holes can function effectively, maintaining the reliability of your sump pump system and protecting your basement from potential flooding.
