For optimal performance of a jet pump system, the first check valve should be installed directly above the pump.
Primary Check Valve Location
Based on best practices for jet pump installations, the initial check valve plays a critical role in maintaining prime and ensuring efficient operation.
- Primary Location: The recommended placement for the first check valve is directly above the pump.
This placement helps prevent water from flowing back down the pipe into the well when the pump shuts off, which is essential for a jet pump to function correctly upon restarting.
Considerations for Well Depth
While the first check valve is located directly above the pump, the overall system design may require additional check valves depending on the well's depth and the pump's position relative to the water level.
- Maximum Height Above Water Level: A check valve should never be installed more than 25 feet (7.5 meters) above the lowest pumping level in the well. This is because jet pumps rely on the pump being within 25 feet of the water surface to lift water effectively using suction principles. Installing a check valve too high above the water level can lead to suction issues.
- Deeper Settings: For settings where the pump is positioned significantly deeper than 25 feet above the lowest pumping level, it is recommended that a line check valve be installed every 200 feet in the drop pipe. These additional check valves help reduce the weight of the water column on the lower check valve and the pump, improving efficiency and preventing potential issues in very deep installations.
Summary of Check Valve Placement
Here's a quick overview of check valve placement for jet pump systems:
| Location | Purpose | Condition |
|---|---|---|
| Directly above pump | Maintain prime for restart | Standard for all jet pump installations |
| Below 25 ft water level | Ensure suction is maintained | Check valve must be within 25ft of lowest level |
| Every 200 ft (drop pipe) | Reduce water column weight | Recommended for deep well installations |
Proper check valve placement is crucial for the reliability and performance of your jet pump system, ensuring it holds prime and operates efficiently. Always follow manufacturer guidelines and local plumbing codes when installing pump system components.
