Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-18-2011, 07:25 PM   #1
Fleetwood Owners Club
Join Date: Mar 2010
Posts: 47
Adjustable water regulator

This morning I purchased a water regulator with a pressue gauge. I visited with a fellow RV'er for hints for installation. When we opened his plumbing the bay door the first thing I noticed was his pressure gauge was pegged past the 120 PSI point. He said it was because he had used his shower before he left the coach. He went on to say as the water heats pressue builds throughout the system and until released it will stay at the 120+PSI. He opened a valve in the bay and the pressure dropped to 50 PSI. QUESTION: Is this normal?? Is there a relief valve that can be inserted into the system to prevent this pressure build up?? The "pop off"
valve at the water heater is rated at 150 PSI providing no relief of pressure until the entire system would already be jeopardized.

Thanks in advance


PS: Happy Fathers Day to all us Dad's and our Dad's

nam.64 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-18-2011, 07:43 PM   #2
Senior Member
Join Date: Apr 2010
Location: Full Timer / Vagabond
Posts: 609
I am retired after 50 years of plumbing and heating.

IMHO every RV with a water heater should have an accumulator (pressure) tank to stop this sort of thing.
There is supposed to be an air bubble in the top of the water heater for expansion but it never works and I think it is a dangerous thing to rely on.

The RV companies either go about this in ignorant bliss or more than likely are cutting corners for a larger profit. They should also build in a water pressure regulator.

Ralph & Snickers
2006 3500 Chevy Dually - 8.1 - Allison
2006 30' New Horizon - Solar
ralper is offline   Reply With Quote
Old 06-19-2011, 07:28 AM   #3
Moderator Emeritus
Gary RVRoamer's Avatar

Fleetwood Owners Club
Freightliner Owners Club
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 16,432
There is no normal reason for pressure to build up like that in an RV system. The air "head' in the water heater is normally sufficient to cushion the modest pressure build-up from the heater. Many (but not all) RVs have a check valve on the cold inlet to the tank anyway and this prevents the pressure from pushing back into the rest of the system.

My guess is that the rig you looked at had lost the air cushion in the water heater tank. It is easy to restore by letting the tank cool off, shutting off the external supply (pump or city water), opening a faucet to relive any internal pressure, and then opening the PT relief valve to let water drain out to the level of the PT valve.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
Gary RVRoamer is offline   Reply With Quote
Old 06-19-2011, 07:47 AM   #4
Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 3,968
The simplest way to keep a air cushion is to drain the water hose each time you put it up. When you get to the next campground, hook up the hose and turn on the hot faucet. the air will go into the HWH and replace the air cushion.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
ga traveler is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Valteera adjustable water pressure regulator with gauge SargeW MH-General Discussions & Problems 29 03-29-2009 07:19 PM
Kit Kamper Projects - Project #14, Water Heater Replacement RedneckExpress Vintage RV's 5 10-28-2008 04:31 PM
Low Hot Water Pressure rv-time Winnebago Industries Owner's Forum 7 05-06-2008 06:53 AM
Watts water pressure regulator for sale gypsynut Winnebago Industries Owner's Forum 2 01-22-2008 08:16 AM
Water Pressure Regulator - DSDP 4304 JavaJelly Newmar Owner's Forum 8 10-18-2006 11:22 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:36 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.