A check valve on a pool pump system is typically installed at the connection point where the pump pushes water into the rest of the circulation system.
Based on the reference provided, a check valve is usually mounted at the part where the pool's pump is connected to the main water supply line.
Understanding the Location
In a standard pool plumbing setup, the "main water supply line" connected to the pump typically refers to either the pipe bringing water from the pool to the pump (suction side) or the pipe carrying water from the pump to the filter and other equipment (discharge side).
While check valves can serve different purposes depending on their location, the reference points to the connection at the pump. The most common and practical application near the pump is on the discharge side, immediately after the pump's outlet port. This line then leads to the filter, heater, and other components.
Why Install a Check Valve Here?
The primary purpose of a check valve is to allow water to flow in only one direction. Installing it at this point prevents water from flowing backward from the filter, heater, or return lines back towards or through the pump when the pump is turned off.
- Protects Equipment: Prevents chlorinated or heated water from flowing back and potentially damaging the pump impeller or filter components.
- Maintains Prime: Helps the pump maintain its prime, especially if the pump is located above the pool's water level.
- Prevents Draining: Can prevent water in the plumbing lines (like heaters or raised spas) from draining back into the pool or through the system when the pump stops.
Common Installation Point Diagram
| Component | Flow Direction | Check Valve Location |
|---|---|---|
| Pool Skimmer/Drain | > | |
| Suction Line | > | |
| Pool Pump | > | Immediately after the discharge port |
| Check Valve | > | |
| Filter | > | |
| Heater (Optional) | > | Often another check valve before here |
| Return Line | > | |
| Pool Return Jet | > |
Note: The reference specifically mentions "at the part where the pool's pump is connected to the main water supply line," which aligns closely with the discharge side connection point leading to the rest of the system.
Practical Insights
- Type of Check Valve: Common types include swing check valves or spring check valves. Swing check valves are often preferred for high flow applications with minimal pressure drop.
- Orientation: Ensure the check valve is installed with the flow arrow pointing away from the pump, towards the filter and pool returns. Incorrect orientation will block water flow.
- Specific Needs: While the general location is after the pump discharge, specific system designs (e.g., multi-level pools, spas, solar heaters) may require additional check valves in other locations to manage unique flow dynamics.
In summary, based on the provided reference, the check valve is typically installed where the pump connects to the main circulation pipe carrying water away from the pump, which is the discharge side.
