How Does a Backflow Preventer Work?
A backflow preventer is a crucial component in plumbing systems to prevent the contamination of clean water by backflow. Let’s explore how it works and the different types available.
Function of a Backflow Preventer
One-Way Valve: A backflow preventer allows water to flow in only one direction. When water flows from the main supply line into your home, the valve opens, allowing clean water to enter. However, if water tries to flow back in the opposite direction (due to changes in pressure or other factors), the valve closes, preventing any backflow.
Types of Backflow Preventers
- Double Check Valves:
- These devices have two check valves to keep contaminants out of the clean water.
- If one valve sticks open, the second check valve acts as a backup.
- Commonly used in fire, lawn, and boiler systems.
- Reduced Pressure Zones (RPZ):
- RPZ backflow preventers also have two check valves.
- Additionally, they include a relief valve that opens to release contaminated water.
- Used in cities and suburbs to protect against backflow.
- Pressure Vacuum Breakers (PVB):
- Designed for lawn irrigation systems.
- Prevents contaminated water from sprinkler systems from entering the clean water supply.
Signs of a Broken Backflow Preventer
- Discolored Water:
- A malfunctioning backflow preventer can lead to discolored or cloudy water.
- This can pose health risks, such as nausea and diarrhea.
- Water Leaks:
- Age and wear can cause backflow preventers to malfunction.
- Leaks may occur, leading to mold and unpleasant odors.
Inspection and Maintenance
- Building owners are obligated to protect the drinking water system by installing a backflow prevention device.
- Annual inspections are essential to ensure proper functioning.
- Residential buildings with fewer than 9 units or less than 3 stories are exempt from this requirement.
- If contamination originates from a building, the owner may face criminal prosecution and cleanup costs.
Remember to have your backflow preventer inspected regularly by a certified professional. If you suspect any issues, reach out to Pars Plumbing for reliable plumbing repair services in Montreal.
