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Old 07-20-2013, 09:47 AM   #16
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Whistling / Noisy Pressure valve on water main


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Have you never heard a squealing flushometer on a urinal or toilet?
E... Yuup... plenty.... just never heard a whisling from a PRV.... but my experience as a GC is limited in plumbing... and I've probably had to replace only maybe 5-6 in my life....

but I'll recognize that symptom now in the future if I encounter it... Thanks

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Old 07-20-2013, 02:13 PM   #17
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Whistling / Noisy Pressure valve on water main


Make sure you adjust your water pressure to about 65 pounds static after your install. They come at 40 pounds usually.
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Old 07-20-2013, 03:44 PM   #18
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Whistling / Noisy Pressure valve on water main


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Make sure you adjust your water pressure to about 65 pounds static after your install. They come at 40 pounds usually.
Ghost... Ya know what I can never remember... is which direction the screw goes for more/less pressure.... guess I don't adjust them that often or regularily....

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Old 07-20-2013, 04:12 PM   #19
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Whistling / Noisy Pressure valve on water main


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Great advice from everyone.... as to solving the PRV pressure problem....

but has ANYONE ever heard of a whistling noise from a PRV valve..


.... just plain curiosity
Yeah, that was my original post. Mine was whistling super loud when my toilet was filling. Eventually it turned into replacing it when I tested the pressure to see if it was bad.
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Old 07-20-2013, 04:16 PM   #20
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Whistling / Noisy Pressure valve on water main


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Good question mtn remodel. I really don't know the answer, but I would take a guess it comes from debris stuck to it, by increasing the pressure and thus reducing the restriction, it could go away temporarily.

You could try to either clean the PRV inlet or better yet just replace the whole thing with a new one. Wichever is easiest for homeowner.
So I replaced my valve today. The old one had a rock against the strainer on the inlet side, maybe 1/4" in diameter. So I wouldn't be surprised if dirt that at some point got into the city's line might've come through and junked up or got stuck somewhere in my valve, possibly the cause of its failure. I guess water can whistle just like air given the right circumstances, anything to cause a vibration in the audible range.
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Old 07-20-2013, 04:18 PM   #21
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Whistling / Noisy Pressure valve on water main


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Pinpointing noises like this are often difficult, but the first thing I would do is replace the fill valve on the toilet. It's the most likely culprit and a fairly easy repair. I would try that first before you adjust, rebuild or replace the prv valve.

One thing to try is to turn the water off to each toilet, one at a time, and check if the noise stops. If the noise stops when you shut off a particular toilet then change the fill valve in that toilet tank.

There are of course other possible causes. You could have a faulty pressure reducing valve (as you have already stated) on the water main or a faulty back flow preventer or and outside faucet with a back flow preventer that has minimal flow.
Quote Dan "Yeah, that was my original post. Mine was whistling super loud when my toilet was filling. Eventually it turned into replacing it when I tested the pressure to see if it was bad. "


Dan... yes, I guess I thought there was a question as to what was whistling.
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Old 07-20-2013, 04:29 PM   #22
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Whistling / Noisy Pressure valve on water main


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It's called "Double Union Solder" - the Watts representative I talked to said the N55BDUS should be able to replace the N35BDUS at the unions.

Same ratings otherwise.

Local plumbing supply house says they have them in stock. So I'll try one tomorrow and see how it goes!

Thanks again.
So I promised I'd report back. I went to the local supply house, took the faulty Watts N35B 3/4" valve with me.

They had both the N45B and N55B valves in stock (among others) - it was clear that either one would fit the union joints, and they both were factory set to 50 PSI with a range from 25 to 75 PSI. N55B was all metal, N45B had some plastic part on it. Asked the guy at the shop which he recommended. He just shrugged his shoulders and said, "They both work. We sell a lot of both of them."

I went with the N55B for $70. The model they had was just the threaded side of union on one side, and full union joint with solder joint on other. I wanted to replace the o-rings in the union joints too - since only one side had both sides of the union there was only one o-ring. He just took another out of a box and handed me the o ring from that one too. Very nice.

The union joints were a piece of cake. One side is flat copper, the other side is flanged slightly with a groove for the o-ring. No paste, no thread tape. Took 2 minutes to get the old off, 2 minutes to get the new on, and no leaks or anything. I took a fine file to both the flat copper sides and a brillo to clean them shiny again.

Water pressure tested at 45 PSI. I turned it up a little, to around 50 PSI. We'll leave it there and see how it goes for a couple weeks.

Oh - and last but not least, no whistle when the toilet fills!
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Old 07-20-2013, 04:31 PM   #23
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Whistling / Noisy Pressure valve on water main


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Ghost... Ya know what I can never remember... is which direction the screw goes for more/less pressure.... guess I don't adjust them that often or regularily....

Best
On my model (N55B), it was clockwise (CW) for more pressure
counterclockwise (CCW) for less pressure.
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Old 07-20-2013, 04:34 PM   #24
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Whistling / Noisy Pressure valve on water main


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Quote Dan "Yeah, that was my original post. Mine was whistling super loud when my toilet was filling. Eventually it turned into replacing it when I tested the pressure to see if it was bad. "


Dan... yes, I guess I thought there was a question as to what was whistling.
I didn't do anything about the toilet, even though that was the advice on the first thing to try. I had other suspicions about the pressure because a while ago the manifold started leaking, and I had to really crank down the joint to get it to stop, and the joint by my water expansion tank was leaking a little too. Seemed like pressure gauge to double check was the easiest first step. The rest followed.
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Old 07-20-2013, 04:35 PM   #25
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Whistling / Noisy Pressure valve on water main


Thanks everyone for all your great help and advice. I hope this is a useful thread to searchers in the future. Particularly to know what replacements work with the N35B - I searched all over the internet and nothing said. I had to call the Watts rep. Now at least the compatibility is recorded here - if Google ever ventures to find it!
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Old 07-20-2013, 04:44 PM   #26
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Whistling / Noisy Pressure valve on water main


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Quote Dan "Yeah, that was my original post. Mine was whistling super loud when my toilet was filling. Eventually it turned into replacing it when I tested the pressure to see if it was bad. "


Dan... yes, I guess I thought there was a question as to what was whistling.
Oh, I get it now. I never realized that nuance in ''jmon's" first post. I always read it as "pinpointing the _cause_ of whistling" - and I read it as that I guess because it was so clearly coming from the PRV. I knew the noise was the PRV, I could stand next to it and I'd have to plug my ears. Anywhere else in the house (including by the toilet or along other pipes) I could hear it coming from over by the PRV.

So I think not only was the cause of the whistling the PRV, but the whistling itself was also coming from the PRV.

When I think about it, I suppose it's also possible that the toilet valve's idiosyncrasies coupled with the failing PRV also caused the noise too, but as to where it was coming from I had no question.

I'm glad you brought it up I really hadn't thought about it that way.
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Old 07-20-2013, 08:48 PM   #27
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Whistling / Noisy Pressure valve on water main


The only reason I said 65 lbs pressure is that is the design pressure of most fixtures for optimum working order.
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Old 07-22-2013, 09:23 PM   #28
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Whistling / Noisy Pressure valve on water main


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The only reason I said 65 lbs pressure is that is the design pressure of most fixtures for optimum working order.
I did notice that the handle on our kitchen sink faucet, which lifts up, will "drift" downward at anything under about 55 and eventually turn off. Sounds like that might be related to the 65 PSI optimum pressure. We turned it up a little past 55 and it stopped drifting downward. Thanks for the tip.

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