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Old 04-30-2007, 09:23 PM   #1
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What is the Maximum water pressure our RVs should operate on? Just installed a onboard ajustable regulator with gauge and am not sure if I can set it higher than the standard 38-40 range of the over the counter hose type regulators.
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Old 04-30-2007, 09:23 PM   #2
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What is the Maximum water pressure our RVs should operate on? Just installed a onboard ajustable regulator with gauge and am not sure if I can set it higher than the standard 38-40 range of the over the counter hose type regulators.
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Old 04-30-2007, 10:49 PM   #3
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I have always read that the standard regulator that comes with most coaches (the freebie brass shotgun shell looking one) is 40-45psi. I keep mine a bit higher at 45-50psi.

Have you checked for a recommendation in Mr. Manual?


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Old 04-30-2007, 11:26 PM   #4
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The manual does not give a pressure amount, just to make sure to always use a regulator...
From 40-45 shouldn't hurt, I was hoping I could go higher to increase the water pressure. What is "Mr. Manual"

TKS, LarryD. 06 39L
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Old 05-01-2007, 01:00 AM   #5
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Onthroad, welcome to iRV2.com. We are glad to have you join us here and look forward to reading of your adventures and experiences. You will want to have the pressure regulator on the hose bibb feeding the hose connected to the RV since this is the weakest link. I use a Watts whole house regulator set at about 50 psi. The plumbing is the RV is probably good for 70 0r 80 psi; the pipe itself is good for 160 psi. Good luck with the regulator and let us know what else we might be able to help with.
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Old 05-01-2007, 01:35 AM   #6
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Thank you so much for your website and the quick response to my question. I have installed a guage and the regulator on my RV at the water in-let connection, where the water hose connects. Hope this is what you called the "Bibb".

Thank you,
Larry & Darlene
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Old 05-01-2007, 04:16 AM   #7
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If you can get to it easily, look at the output pressure printed on your onboard water pump, or read the manual. Mine is the Shur-flo 5900 Smart Sensor 5.7, the following statement is listed in the Installation & Operation Manual:

" Pump shut-off pressure is 65 PSI [4.5 Bar]. System must be designed to handle 65 PSI [4.5 Bar].

Obviously this pressure is not normally reached, but I do know there is more pressure (flow) of water when using the pump then when hooked up to city water.
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Old 05-01-2007, 05:21 AM   #8
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If the pump lists "shut-off pressure" as 65 psi, then this is the pressure in the line that the pressure switch, in the pump, will see before it shuts off. Therefor 65 psi is normaly reached whenever the pump is in use. I have used 65 psi on a on a Watts series N45B-M1 5/8" regulator (with dual filters and a 0-150 pressure gauge on the incoming line) for several years on both Fleetwood and Monaco units. So far no problems. Both Fleetwood and Monaco pressure test water lines over 65 psi. But anything can happen. If you operate over 55 psi be prepared.

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Old 05-01-2007, 06:10 AM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Onthroad:
Thank you so much for your website and the quick response to my question. I have installed a guage and the regulator on my RV at the water in-let connection, where the water hose connects. Hope this is what you called the "Bibb".

Thank you,
Larry & Darlene </div></BLOCKQUOTE>

The hose bibb mentioned is where your water hose connects to the RV park water supply. That way the hose is also protected from too much pressure.
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Old 05-01-2007, 06:28 AM   #10
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AS I understand it, RVIA standards require that RV water systems be pressure tested at 80 psi. I don't know if that means each RV is actually tested at that or whether that is a design spec.

I have my big external regulator set at 60 psi with no problems at all in three different coaches. Typical demand pumps run at about 45-48 psi and the variable speed pumps operate in a broader range of pressures, depending on demand. As was mentioned earlier in this thread, some operate to 65 psi.
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Old 05-01-2007, 06:38 AM   #11
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Great Informaion! Thanks to all for the tips, I feel a max safe is 60 and start testing with 55.

Thank You!
Larry & Darlene
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