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Old 02-21-2012, 07:44 PM   #1
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pressure and volume question


i have a second floor bathroom i just remodeled it has 3/4" copper going up to 2 floor where it then branches to 1/2" put in new 1/4 turn stops on sink and toilet and new supplies with new fixtures also put in new tub and delta scald guard valve turned water back on at shut offs downstairs
no leaks i am so glad but here is my problem when i first turn on sink or tub i have good pressure for like a second or 2 so then it drops off to very little so little that when i try to turn the shower head on it just trickles out. but if i shut evrey thing off for like 2 minutes i get pressure again but then does the same thing. any suggestion to what it could be??

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Old 02-21-2012, 08:02 PM   #2
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pressure and volume question


My first guess is your valves aren't open all the way.
I'm sure someone will be along shortly to give you a full explanation though.

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Old 02-21-2012, 08:11 PM   #3
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pressure and volume question


i turned valves all the way until handle stopped
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Old 02-21-2012, 09:52 PM   #4
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pressure and volume question


Where is the 3/4" copper fed from?
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Old 02-21-2012, 09:55 PM   #5
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pressure and volume question


from basement everything before and after the t that goes upstairs is fine
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Old 02-21-2012, 09:59 PM   #6
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pressure and volume question


Your 3/4" is being fed from a 1/8" main......
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Old 02-21-2012, 10:00 PM   #7
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pressure and volume question


nope this is real it happened
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Old 02-21-2012, 10:04 PM   #8
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pressure and volume question


I have some ideas but I think I will sleep on it.

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Old 02-21-2012, 10:08 PM   #9
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pressure and volume question


I don't get it.
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Old 02-21-2012, 10:10 PM   #10
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pressure and volume question


If its both hot and cold, the main shut off is either partially closed or the valve washer has torn off and is in the seat of the valve blocking flow, this would allow pressure to build, open one of the points of use and the pressure releases but there is no flow.
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Old 02-21-2012, 10:15 PM   #11
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pressure and volume question


Do you have shut offs on both sides of meter,are they both back on?
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Old 02-21-2012, 10:16 PM   #12
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pressure and volume question


jack you were close broken gate valves amazing what happens with all the facts quick and easily with no confusion found and fixed the issue
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Old 02-21-2012, 10:18 PM   #13
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pressure and volume question


no not main but branch valves on upstairs branch
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Old 02-21-2012, 10:20 PM   #14
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Id have a ball valve installed imediately if not sooner.
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Old 02-21-2012, 10:25 PM   #15
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pressure and volume question


It has high resistance probably way upstream...perhaps in the basement. Once you deplete the high pressure, the steady state flow is slow. The reason it flows well initially is with no flow, the pressure equilibrates; no flow means no resistance, so you get full pressure initially. The reason you have good flow for a short while is there is probably some air in the line somewhere upstairs, and until the air is decompressed by releasing some water, it continues to provide high pressure to keep the flow good for a short while. If it takes 2 seconds to slow, I suspect a considerable amount of air in the pipe. After the air has been decompressed, your flow is back to slow due to the restriction somewhere. It could be a small fitting, or perhaps way too much solder somewhere, but somewhere there is a high resistance spot. Could there be an older dome or gate valve that is failing?

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