Backflow preventer (protecting potable water supply)

Jan 13, 2019 3 Replies
D

I seem to see three types of backflow preventers:


  1. valve + vacuum breaker
  2. double-check-valves
  3. double-check-valves + pressure regulator

If I don't need or want pressure regulation how do you compare 1 vs 2 above?



This would be for lawn irrigation or water-powered sump pump.



Examples:



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E

If you've not done so already, check your local codes to see if they specify one type. Some do not allow double check, others do.

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D

Will do. I think the vacuum-breaker approach seems more logical.

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T

That's what's used here, NJ for irrigation connection. I would bet it's probably part of the widely used national plumbing code.

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