Prevent Damage and Fines: A Comprehensive Guide to Draining Sprinkler System Backflow

As winter’s icy grip approaches, it’s crucial to prepare your sprinkler system for the cold weather ahead. Draining the backflow preventer is an essential step to prevent costly damage and ensure your system functions smoothly come spring.

What is a Sprinkler System Backflow Preventer?

A backflow preventer is a device installed in your sprinkler system to prevent contaminated water from flowing back into the municipal water supply. This is important to protect both your home and the city’s water system from potential health hazards.

Why Drain the Backflow Preventer?

During winter, freezing temperatures can cause water in your sprinkler system to expand and put pressure on the backflow preventer. This can damage the device or cause it to malfunction, leading to costly repairs or even system failure. Draining the backflow preventer removes this water and prevents such issues.

Step-by-Step Guide to Draining Sprinkler System Backflow

1. Gather Your Tools

You will need:

• Hose bib key
• Bucket
• Screwdriver or wrench (optional)

2. Turn Off Water Supply

Locate the main water shut-off valve and turn it off. This is usually found near the street or in your basement.

3. Open Sprinkler Valves

Turn on all the sprinkler valves in your system. This will release any remaining water from the pipes.

4. Locate the Backflow Preventer

The backflow preventer is typically located near the main water shut-off valve. It is a large, brass or plastic device with two or more valves.

5. Open Test Cock

Open the test cock on the backflow preventer. This is a small valve located at the bottom of the device.

6. Drain Water

Place the hose bib key on the backflow preventer and open the valve. Allow the water to drain into the bucket.

7. Close Test Cock and Valve

Once the water has stopped flowing, close the test cock and the valve on the backflow preventer.

8. Reassemble the Backflow Preventer (Optional)

If you removed any screws or bolts during the process, reassemble the backflow preventer now.

9. Turn on Water Supply

Slowly turn on the main water shut-off valve. Check for any leaks around the backflow preventer.

Additional Tips

• Use a bucket or hose to catch the draining water and prevent it from freezing on the ground.
• If you have a double-check valve backflow preventer, you will need to remove the caps and drain both valves.
• If you encounter any difficulties or leaks, consult a qualified plumber.

Benefits of Draining Sprinkler System Backflow

• Prevents damage to the backflow preventer and sprinkler system
• Protects your home and the municipal water supply from contamination
• Ensures proper system function in spring
• Saves you money on potential repairs

The Bottom Line: Winter-Proof Your Sprinkler System

Draining your sprinkler system backflow is a simple yet effective way to protect your property and ensure a trouble-free spring. By following these steps, you can prevent costly damage and enjoy a functioning sprinkler system when the warmer weather returns.

What You Need to Learn

Q: When should I drain my sprinkler system backflow?

A: Drain the backflow preventer before the first hard freeze of winter.

Q: How often should I drain the backflow preventer?

A: Once a year, before winter.

Q: What happens if I don’t drain the backflow preventer?

A: The backflow preventer can freeze and damage, leading to system failure.

Q: Can I drain the backflow preventer myself?

A: Yes, if you are comfortable following the steps outlined above. Otherwise, consult a plumber.

Q: What should I do if I have a double-check valve backflow preventer?

A: Remove the caps and drain both valves.

Q: Where can I find a qualified plumber?

A: Contact your local home improvement store or search online for plumbers in your area.