Summary
This article explains how to winterize a sprinkler system backflow preventer to help protect it from freezing damage. A short video at the top demonstrates the steps involved.
When to use this
Use this guide if you are:
Preparing a sprinkler system for freezing temperatures
Protecting outdoor plumbing during winter
Unsure how to shut off and drain the sprinkler system
Trying to prevent damage to the backflow preventer
Video: Winterizing a Sprinkler System Backflow Preventer
This video demonstrates how to shut off the water supply, drain the system, and protect the backflow preventer from freezing.
Overview
A backflow preventer is a critical component of a sprinkler system that prevents contaminated water from flowing back into the main water supply. Because it is typically installed above ground, it is especially vulnerable to freezing temperatures.
Proper winterization helps reduce the risk of cracking or internal damage.
Common Questions Covered in the Video
What Is a Backflow Preventer?
The video explains that a backflow preventer is a valve assembly designed to protect the potable water supply from contamination.
Why Winterization Is Necessary
Freezing temperatures can cause trapped water inside the backflow preventer to expand, leading to cracks or failure. Winterizing helps prevent this damage.
Identifying the Water Shut-Off Valve
The video demonstrates how to:
Locate the sprinkler system shut-off valve
Determine whether the valve is on or off based on its position
Steps to Winterize the Backflow Preventer
The video explains how to:
Turn off the water supply to the sprinkler system
Open test cocks or drain points to release trapped water
Position valves to allow remaining water to drain
Additional Freeze Protection Measures
The video discusses extra precautions, including:
Insulating the backflow preventer
Using protective covers designed for winter conditions
Ensuring valves remain partially open as recommended
Troubleshooting
Water does not drain → Valve may not be fully shut off
Unsure valve position → Check handle alignment with piping
Concern about freezing → Additional insulation may be needed
FAQs
Q: Do I need to winterize the backflow preventer every year?
A: Yes. Annual winterization helps prevent freeze damage in colder climates.
Q: Can insulation alone prevent freezing?
A: Insulation helps but does not replace proper draining and shutoff.