Everything You Need to Know About Backflow Prevention

Backflow prevention is an important aspect of plumbing designed to prevent contamination of city water supplies. Roanoke, Virginia, like many other cities, requires the installation of backflow preventers on certain types of plumbing systems to ensure water supplies remain safe and contaminant-free.

What is backflow?

Backflow occurs when the normal flow of water in a plumbing system reverses, causing unsafe water or other substances to flow back into the clean water supply. This can happen when the water pressure in the freshwater supply suddenly drops, or when the pressure in the non-potable water supply increases, for example when a fire hydrant is opened or when a water main bursts.

• Reflux can be caused by several factors, including:
• connections between potable and non-potable water sources,
• Improper plumbing fixtures
• equipment malfunctions.

What are Backflow prevention devices?

Backflow preventers are designed to prevent backflow by creating a physical barrier between the fresh water supply and the service water supply. There are several types of backflow preventers commonly used in plumbing systems, including air gaps, check valves, and vacuum zone devices.

Air Gaps

Air gaps are among the simplest and most effective types of backflow preventers. They work by creating a physical separation between the fresh water supply and the service water supply, usually by creating a distance between the two water sources that is at least twice the diameter of the water pipe. This prevents backflow as there is no physical connection between the two water sources.

Double-check Valves

Check valves are another type of check valve commonly used in plumbing systems. They work by creating a physical barrier between the fresh water supply and the reclaimed water supply using two check valves installed in series. Check valves are designed to only allow water to flow in one direction, preventing backflow.

Reduced Pressure Zone

Reduced pressure devices are the most complex and demanding type of backflow prevention device. They work by creating a physical barrier between the fresh water supply and the process water supply using a series of valves and chambers. The unit is designed to maintain a lower pressure in the domestic water supply than in the clean water supply, creating a pressure differential that prevents backflow.

Where are Backflow prevention devices Installed?

Roanoke, Virginia requires the installation of check valves on certain types of plumbing systems to ensure the water supply remains safe and contaminant-free. Specific requirements for backflow preventers vary depending on the type of plumbing system, building location and risk of contamination.

For example, backflow preventers should generally be installed in irrigation systems to prevent contamination of city water supplies by fertilizers, pesticides, and other chemicals commonly used in landscaping. Likewise, backflow preventers should be installed in sprinkler systems to prevent contamination of the city’s water supply with flame retardants and other chemicals commonly used in firefighting. fires.

Backflow preventers are not only required by law, they are also an important part of ensuring the health and safety of city dwellers. Contamination of the water supply can lead to a variety of health problems, including gastrointestinal disorders, respiratory infections and skin irritation.

Frequently Asked Questions (FAQs) about Backflow Prevention:

Clearing Common Doubts

Q1: What is the main cause of backflow issues? 

Backflow can be caused by changes in water pressure, such as during water main breaks or high demand. Plumbing system failures, improper connections, and cross-connections can also lead to backflow.

Q2: Are backflow prevention devices mandatory? 

In many jurisdictions, backflow prevention devices are mandatory for certain types of properties, especially those with a higher risk of contamination. Check local regulations to determine whether these devices are required for your property.

Q3: Can I install backflow prevention devices myself? 

It’s recommended to hire a licensed plumber to install backflow prevention devices. Proper installation and testing are essential to ensure these devices function correctly.

Who installs backflow prevention devices?

Backflow preventers are typically installed by licensed installers who are trained in the proper installation and maintenance of these devices. Regular maintenance and testing of backflow preventers is essential to ensure they are working properly and providing adequate protection against backflow. At Wisler Plumbing & Air, our licensed plumbers can properly install backflow preventers in your home or business. Contact us today for an offer!