Best Practices for Winterizing a Backflow Preventer in a Sprinkler System

Winterization is crucial for the longevity and functionality of your sprinkler system. One of the critical components to winterize is the backflow preventer, which prevents contaminated water from entering the clean water supply. This guide provides step-by-step instructions on how to properly winterize a backflow preventer to ensure it remains in peak condition through the winter months.

Understanding Backflow Assemblies on the Market

The market offers a variety of backflow assemblies, each designed to meet specific needs and conditions. These assemblies vary in type and complexity, leading to slightly different winterization procedures. Understanding the type of backflow preventer you have is the first step to effective winterization.

The Importance of Proper Winterization

Incorrect or improper winterization of a backflow preventer can lead to serious damage. Freezing temperatures can cause water inside the device to expand and crack the assembly's body. By following the steps outlined below, you can protect your backflow preventer and ensure your sprinkler system operates optimally in the spring.

Step-by-Step Winterization Process

Step 1: Turn Off the Water Supply

The first step in winterizing your backflow preventer is to shut off the water supply at the isolation valve. This is a crucial step to prevent freezing and potential damage. If your system does not have an isolation valve, consider installing one. This can be a simple and cost-effective solution. Expect a cost of $100 to $200 for installation.

Step 2: Drain the Backflow Assembly

Once the water supply is shut off, you need to drain the backflow preventer. This is done by opening the test-cocks, which vary in number depending on the type of assembly you have. There are typically two or four test-cocks, except for AVB (Air Vacuum Breaker) assemblies which have none. To open the test-cocks, insert a flat-head screwdriver and give each screw a quarter turn, aligning the slot with the port.

Step 3: Adjust the Ball Valves

Next, turn both ball valve handles to a 45-degree angle, positioning them to be half open and half closed. This helps ensure that any remaining water is properly drained from the assembly.

Step 4: Cover the Assembly

Finally, cover the entire assembly to protect it from the elements. This helps prevent any leftover moisture from freezing and causing further damage.

Common Missteps and How to Avoid Them

Many people mistakenly believe that simply closing the ball valves will protect the backflow preventer from damage. However, this is not the case. Closing the ball valves without turning off the water supply can trap water inside the device, leaving it vulnerable to freezing. Additionally, if you do not have an isolation valve, it's important to cover the backflow preventer or protect it with warning tape and a cover to ensure proper protection.

Conclusion

Properly winterizing your backflow preventer is essential for maintaining the integrity of your sprinkler system throughout the colder months. By following the steps outlined above, you can ensure your backflow preventer stays in top condition and is ready for the spring season. Remember, prevention is key, and a bit of care now can save you costly repairs later.