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Welcome to Plbg.com (also known as PlumbingForum.com) where plumbing advice, education, information, help and suggestions are provided by some of the most experienced plumbers and plumbing contractors anywhere who all wish to "give back" to society. Since 1996 we have been free without popup or other invasive ads and known to be the best online STRICTLY PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to find and/or purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't track you. We absolutely do not sell your personal information. We are made possible by:  

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 Is this normal for a PRV?
Author: SewageMountain3000 (PA)

House had an old PRV that was leaking so I replaced it with this:

[#$%&]

The old valve was defective so I have nothing to compare it to, there was no gauge, and plumbing had to be redone so the water was always off since all of the leaks were discovered.

I installed the valve in the exact same place per the instructions (i.e. no water in the line) and preset it to 50 PSI. Turned the water on and it holds at 50 PSI with all of the fixtures as it should. It drops to about 42 if I open up a faucet in the kitchen or the bathroom which I assume is normal. My only concern is that the valve is silent when none of the fixtures are open. But when I open any fixture, there is an audible hiss coming from the valve. Is the noise part of normal operation or is this a faulty valve?

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 Re: Is this normal for a PRV?
Author: bsipps (PA)

In my experience a low audible hiss is normal until the system charges to static pressure

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