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Old 05-30-2013, 07:45 PM   #1
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Low water flow, new PRV, 90psi static


I had the water district out yesterday to diagnose a low water flow problem. Static water pressure measured at water heater is 90 psi, but when we showered it would drop to 25 psi, same with outside hose bib, starts out strong then drops to 25psi.

Water district replaced the broken spring in the PRV at the water meter.

Result is better at all inside valves but still drops to 40psi. Shower is noticeably better though at 40psi.

However, now outside hose bib alone becomes practically useless, dropping to 13psi, with no other open valves.

Secondly, if we use two indoor valves (toilet and shower or sink and shower) water flow pressure reduces, then returns when one of them is turned off.

We built the house in 2000, so pipes should be clean. Live in Seattle with soft water, no water softener. We looked for another PRV but did not find one where the water enters the house.

We did notice that we have a 1 inch water line, but the meter says 5/8". The water district switched over to electronic meters a couple years ago, but why would we only notice this water flow change now?

Neighbors on both sides do not notice any water pressure problems.

Original propane water heater, no evidence of failure.

Any other solutions for outside hose bib water flow problem and using two valves inside the house. We've never experienced this over the past 13 years.

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Old 05-30-2013, 08:21 PM   #2
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Low water flow, new PRV, 90psi static


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Originally Posted by GEAF View Post
We did notice that we have a 1 inch water line, but the meter says 5/8".
A 1" service line from the street into the house?

Second... is the PRV in your home or at the meter?
Third... what pipe size is your house plumbing?

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Old 05-30-2013, 08:50 PM   #3
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Low water flow, new PRV, 90psi static


Yes, a 1 inch service line from the water meter to the house, which is about 400 feet long. Then it connects to a 1 inch copper pipe going into the house under our kitchen sink.

It looks like a 3/4 inch pipe to the water heater. Pipes running to bathrooms, I believe are 1/2 inch copper.

The PRV is at the water meter (400 feet from house, at road) and this is the spring that the water district replaced. They may have even replaced the whole PRV.

No other PRV in house. We think the water pressure has been reduced for a couple years now in the showers, but now the drastic hose bib and two open valves reduction is within the past couple weeks.

Is their a strainer/ filter that needs to be cleaned somewhere?
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Old 05-30-2013, 09:40 PM   #4
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Low water flow, new PRV, 90psi static


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Originally Posted by GEAF View Post
The PRV is at the water meter (400 feet from house, at road) and this is the spring that the water district replaced. They may have even replaced the whole PRV.
You didn't mention 400 LF of pipe in the first post (tsk!)
Will the city tell you what the pressure is BEFORE the meter box and their PRV?

I think you're on the right track when you mentioned the 5/8...
choking the flow down before it goes into the 1" pipe isn't good.

I suspect you need a larger meter box (on the property owners dime usually) to allow more volume to flow and maybe another PRV in the house.

Take a look at this page:
http://www.fordmeterbox.com/products...bSec=Yokeboxes
You'll notice that Ford makes different sizes
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Old 05-31-2013, 04:17 PM   #5
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Low water flow, new PRV, 90psi static


Ever consider it might not be a pressure issue but a supply issue?

If your main feed from the street has a kink your pressure will still be good. But the amount of water will be little... I hope I explained this well for you.

I would suggest seeing how many gallons of water feed you get when it enters your house per min. Look up your pipe size and see what you should have at your house pressure.
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Old 05-31-2013, 11:56 PM   #6
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Low water flow, new PRV, 90psi static


Thanks guys. The water district came out again today, while I was at work. It loos like they replaced the PRV at the meter. My water flow is now excellent, better than ever actually.

My overall water pressure is now 65 psi static and barely reduces with any use.

Happy ending.

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