Febco Backflow Preventer Winterization
Febco backflow preventers play a key role in keeping contaminated water out of irrigation systems. Although these units are built for durability, proper care of these units is important—especially in areas with cold winters. If you want to protect your system from freezing temperatures, this Febco backflow preventer winterization guide will walk you through the process from start to finish.
These instructions apply to 765 pressure vacuum breaker, 850 double check valve, 860 reduced pressure zone and 880 reduced pressure zone models.
Supplies
- Adjustable Wrench
- Screwdrivers
- Bucket
- Cleaning Cloths/Towels
- Compressed Air Source (if using the blowout method)
- Air Hose with Fittings (if using the blowout method)
Standard Instructions
- Step 1. Close the main shutoff valve - Turn off the main shutoff valve to keep water from flowing into the system.
- Step 2. Open all inlet and outlet drain valves - Unseal the inlet and outlet drain valves so that water can drain out of the system.
- Step 3. Place a bucket under any indoor valves (if necessary) - Prevent water damage by putting a bucket or other container under any indoor ports.
- Step 4. Open the ball valves to 45° (if needed) - See if the assembly has ball valves; if so, turn them until they’re at a 45° angle (half open, half closed).
- Step 5. Unseal the testcocks - Release pressure within the system by opening the testcocks.
- Step 6. Drain the water - Allow the water to flow out of the system.
- Step 7. Leave most of the valves open - Keep the inlet and outlet drain, testcock, and ball valves open at a 45° angle so that any remaining water can evaporate. Note that the shutoff valve should remain closed.
Blowout Procedure
- Step 1. Close the main shutoff valve - Prevent water from entering the system by turning off the main shutoff valve.
- Step 2. Open the outlet drain valve - Unseal the outlet drain valve.
- Step 3. Connect the air supply to the outlet drain valve - Attach the air hose to the outlet drain valve.
- Step 4. Inject air into the system - Blow compressed air through the system to push out residual water.
- Step 5. Open the ball valves to 45° - Relieve pressure and release moisture by opening the ball valves at a 45° angle.
- Step 6. Leave most of the valves open - Make sure the outlet drain and ball valves stay open at a 45° angle after completing the blowout procedure so that any residual moisture can evaporate. Note that the main shutoff valve should remain closed.
Winterization FAQs
What Is Backflow Preventer Winterization?
Backflow preventer winterization is the process of draining water from the valve and surrounding plumbing to prevent freeze damage during cold weather. Although the water is usually allowed to drain out naturally after opening certain valves, compressed air can also be used to push water out of the system.
Why Winterize Backflow Preventers?
Winterization is crucial for preventing damage caused by freezing water—if water freezes inside a backflow preventer, it can crack the valve body or internal components, leading to costly repairs or replacements.
When Should You Winterize Backflow Preventers?
Winterize your backflow preventer in the early fall, about 1-2 weeks before temperatures reach 32°F (0°C) for the first time that season. The average date of the first freeze varies by location, so use a first freeze map to determine when it’s best to perform the winterization process in your area.
What’s the Difference Between the Standard and Blowout Procedures?
The standard winterization procedure involves opening the drain valves so that water can flow out of the system on its own. On the other hand, the blowout method uses compressed air to push the water out of the system.