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Check Valve 101: Do You Need One with Your Backflow Unit?



Backflow units are a crucial component of any plumbing system, as they prevent contaminated water from flowing back into the clean water supply.


However, many people are unaware that there's another essential component that can enhance the performance of their backflow unit: the check valve. In this blog, we'll explore the importance of check valves, how they work, and whether you need one with your backflow unit.


What is a Check Valve?


A check valve is a type of valve that allows fluid to flow in one direction, while preventing it from flowing in the reverse direction. In the context of backflow prevention, a check valve is used to ensure that water flows only from the clean water supply line to the backflow unit, and not from the backflow unit back to the clean water supply line.


Why Do I Need a Check Valve with My Backflow Unit?


There are several reasons why you may need a check valve with your backflow unit:


  • Prevents Backsiphonage: Check valves prevent backsiphonage, which occurs when water flows backwards through the backflow unit, potentially contaminating the clean water supply.

  • Prevents Backpressure: Check valves also prevent backpressure, which occurs when pressure builds up in the backflow unit and flows back into the clean water supply.

  • Enhances Performance: Check valves can improve the performance of your backflow unit by ensuring that water flows smoothly and efficiently through the unit.

  • Reduces Maintenance: Check valves can reduce maintenance costs by preventing damage to the backflow unit and other components in the plumbing system.


How Do I Know if I Need a Check Valve?


To determine if you need a check valve with your backflow unit, consider the following factors:


  • Type of Backflow Unit: If you have a double-check valve or a reduced pressure zone (RPZ) backflow unit, you may not need a check valve. However, if you have a vacuum breaker or a pressure vacuum breaker backflow unit, a check valve is highly recommended.

  • Water Pressure: If you have a high water pressure system, you may need a check valve to prevent backpressure and backsiphonage.

  • Plumbing System Design: If your plumbing system is designed to allow for backflow, you may need a check valve to prevent contamination of the clean water supply.


New Ideas and Advice


  • Consider a Check Valve with a Built-in Regulator: Some check valves come with a built-in regulator that can help maintain a consistent pressure in the plumbing system.

  • Choose a Check Valve with a High Flow Rate: If you have a high-flow application, choose a check valve with a high flow rate to ensure that water flows smoothly and efficiently through the system.

  • Consult with a Professional: If you're unsure whether you need a check valve with your backflow unit, consult with a professional plumber or backflow prevention expert.


Conclusion:


In conclusion, check valves are an essential component of any backflow prevention system. They prevent backsiphonage, backspressure, and enhance the performance of your backflow unit.


By understanding the importance of check valves and how they work, you can make an informed decision about whether you need one with your backflow unit. Remember to consider the type of backflow unit, water pressure, and plumbing system design when determining whether a check valve is necessary.

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