For optimal performance and maintenance accessibility, install a check valve on an irrigation pump at the outlet, specifically in front of the outlet control valve.
According to instructions from bronze pressure reducing valve manufacturers, the recommended placement for a check valve is at the outlet of the pump and in front of the outlet control valve. This positioning is crucial for facilitating maintenance procedures on the system.
Why This Location Matters
Installing a check valve at this specific point serves several important functions in an irrigation system:
- Prevents Backflow: The primary role of a check valve is to stop water from flowing backward into the pump when it turns off. This prevents potential damage to the pump and avoids draining pipes, which could lead to air entering the system.
- Protects the Pump: Backflow can cause the pump impeller to spin backward, leading to wear and potential failure. Placing the check valve immediately after the pump protects it from this risk.
- Aids in Maintenance: By placing the check valve before the outlet control valve, you can isolate the downstream piping for repairs or maintenance without losing the prime on the pump or draining the main supply line back through the pump.
Recommended Installation Point
Based on expert recommendations, the check valve should be located as follows:
- Directly at the Pump Outlet: Connect the check valve to the discharge port of the irrigation pump.
- Before the Control Valve: Any downstream isolation or control valves should be placed after the check valve.
Consider this simple flow path:
Pump Outlet → Check Valve → Outlet Control Valve → Irrigation System
Types of Check Valves for Irrigation
Several types of check valves are suitable for irrigation systems, each with its own advantages:
- Swing Check Valve: Uses a hinged disc that swings open with forward flow and closes with backflow. Often requires minimal pressure to open.
- Spring Check Valve: Uses a spring to assist in closing the valve, making it effective in various orientations (horizontal or vertical). Helps prevent water hammer.
- Ball Check Valve: Uses a ball that is lifted by forward flow and rolls back to seat, stopping backflow.
Choosing the right type depends on factors like pipe size, flow rate, pressure, and installation orientation.
Key Takeaway
Following the recommended installation point—at the outlet of the pump and in front of the outlet control valve—ensures the check valve performs its function effectively, protects your pump, and simplifies future maintenance tasks on your irrigation system.
