Whistling and hammering new pressure reduction valve

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Plangfield

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We're selling a 3-year-old, new-build home. We've never had any plumbing issues and had several inspectors look at the house both as a buyer, and now as a seller. The current buyer's inspector identified that the water pressure is too high (about 100psi), and the buyer required installation of a pressure reducing valve, which I did. Now the new valve whistles and bangs loudly when any toilet is flushed (as the water is running, not when it stops). I've double-checked that the arrow is pointing in the direction of the water flow, and it is. The more I restrict flow, the worse it gets, but it's pretty bad even when the flow is as open as it gets. Thoughts?
 

Reach4

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Take it up with the provider of the PRV. I think yours is not working right.
 
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