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What's the Difference between a Backflow Preventer and a Check Valve?



When it comes to plumbing, two terms often get tossed around: backflow preventer and check valve. While they may seem similar, they serve distinct purposes and offer different benefits. In this article, we'll delve into the world of plumbing and explore the differences between a backflow preventer and a check valve. From their functions to their applications, we'll cover it all. So, buckle up and get ready to learn about the differences between these two essential plumbing components!


A backflow preventer, also known as a backflow preventer device (BFPD), is a device designed to prevent contaminated water from entering the potable water supply. It's typically installed near the point of connection between the potable water supply and the fixture or appliance.


Backflow preventers work by creating a barrier between the contaminated water and the potable water supply, ensuring that the risk of backflow is minimized.On the other hand, a check valve is a type of valve that allows fluid to flow in one direction but prevents it from flowing in the other direction.


Check valves are commonly used in plumbing systems to prevent backflow, but they're not as effective as backflow preventers in preventing cross-contamination. Here are some key differences between backflow preventers and check valves:


  • Function: Backflow preventers are designed to prevent contaminated water from entering the potable water supply, while check valves are designed to prevent fluid from flowing in the wrong direction.

  • Installation: Backflow preventers are typically installed near the point of connection between the potable water supply and the fixture or appliance, while check valves are installed in various locations throughout the plumbing system.

  • Effectiveness: Backflow preventers are more effective than check valves in preventing cross-contamination and ensuring the safety of the potable water supply.

  • Certification: Backflow preventers are certified by the American Society of Sanitary Engineering (ASSE) and the International Association of Plumbing and Mechanical Officials (IAPMO), while check valves are not.


New Ideas and Advice:


  1. Don't confuse backflow preventers with check valves: While both devices are designed to prevent fluid from flowing in the wrong direction, they serve different purposes and have different functions.

  2. Install backflow preventers near the point of connection: This ensures that the device is closest to the potential source of contamination and can effectively prevent cross-contamination.

  3. Regularly inspect and maintain backflow preventers: This ensures that the device is functioning properly and can effectively prevent cross-contamination.

  4. Consider upgrading to a double-check valve: Double-check valves are more effective than single-check valves in preventing cross-contamination and ensuring the safety of the potable water supply.

  5. Consult with a professional plumber: If you're unsure about which device to install or how to install it, consult with a professional plumber who can provide guidance and expertise.


Conclusion: In conclusion, backflow preventers and check valves are two distinct devices that serve different purposes in plumbing systems. While check valves can prevent fluid from flowing in the wrong direction, backflow preventers are more effective in preventing cross-contamination and ensuring the safety of the potable water supply.


By understanding the differences between these two devices, property owners can make informed decisions about which device to install and how to install it. Remember to consult with a professional plumber if you're unsure about which device to install or how to install it.

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