Blow Out Sprinklers Through Backflow Preventer: A Gardener’s Guide
Backflow preventers are essential components of any irrigation system, safeguarding water quality by preventing the backflow of contaminated water into the municipal water supply. However, these devices can pose a challenge during winterization, as they can trap water within the sprinkler system, leading to freezing and potential damage. To avoid such issues, it’s crucial to properly blow out your sprinkler system through the backflow preventer.
Backflow preventers are designed to block the backward flow of water. They typically consist of a series of check valves and pressure-reducing valves that work together to prevent contamination. While these devices are highly effective, they can also trap water within the system, especially in areas with low elevation or where the sprinkler system is not properly drained.
Water left in sprinkler systems during freezing temperatures can expand, causing pipes to burst and potentially damaging other components. Blowing out the system removes this water, ensuring that it’s safe from freezing damage. By blowing out through the backflow preventer, you can effectively clear the entire system, including the pipes leading to the backflow device.
To blow out your sprinkler system through the backflow preventer, you’ll need a high-pressure air compressor and a suitable air hose. Here’s a general step-by-step guide:
1. Turn Off the Water Supply: Ensure that the main water supply to your home is turned off.
2. Locate the Backflow Preventer: Identify the backflow preventer on your irrigation system.
3. Attach the Air Hose: Connect the air hose to the blow-out port on the backflow preventer.
4. Turn on the Air Compressor: Start the air compressor and gradually increase the air pressure.
5. Monitor the System: As you increase the air pressure, carefully observe the sprinkler heads. Water should begin to expel from them.
6. Adjust Air Pressure: If water is not expelling from all sprinkler heads, increase the air pressure as needed.
7. Check for Leaks: Once the system is completely drained, inspect all connections and pipes for any signs of leaks.
8. Disconnect the Air Hose: Turn off the air compressor and disconnect the air hose from the backflow preventer.
To ensure a successful blow-out, consider these additional tips:
Consult a Professional: If you’re unsure about the process or have a complex irrigation system, consult a professional irrigation technician.
By following these guidelines and taking the necessary precautions, you can effectively blow out your sprinkler system through the backflow preventer, protecting your investment and ensuring a trouble-free start to the next irrigation season.
