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12-04-2012, 08:36 AM
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#1
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Water pressure regulator?
Water pressure may vary greatly in different areas of water in motion, but the total pressure remains constant. So, why a "pressure regulator" on a shore hookup if the pressure is just the on shore pressure when the water is not moving?
I'm thinking that a "regulator" only restricts volume (it just goes through a smaller orifice). And if the on shore pressure is too high, decreasing volume does not protect against a rupture.
Your thoughts?
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12-04-2012, 08:46 AM
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#2
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Senior Member
Alpine Owners Club
Join Date: Jul 2011
Location: Durango CO
Posts: 582
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While a regulator may restrict flow (cheap ones are notorious for this) that is not the way they work. Static pressure can be up to 100+psi at some parks, Red Mountain in Silverton CO is 100-110psi, a regulator keeps pressure at a setpoint such as 45psi at all times, whether water is flowing or not. Most regulators have a pressure range and a GPM rating, as long as the flow is not over the GPM rating pressure remains constant.
Run a good regulator your pipes will love you for it.
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The above post is just my experience/opinion which is worth exactly what you paid for it.
[SIGPIC][/SIGPIC]
'05 Lance 845/'06 F-250 or '99 Alpine 36SDS Usually towing an '01 Wrangler locked on 35"s or moderate '98 Cherokee on 33"s (rear locker only)
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12-04-2012, 08:46 AM
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#3
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bnb1313@aol.com
Monaco Owners Club
Join Date: Feb 2008
Location: Western Montana on the Divide
Posts: 1,561
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I'm not the sharpest knife in the drawer, but I don't understand your statement regarding constant pressure. I'm currently in a park in Las Vegas and the unregulated water pressure is 105 PSI. I use a Watts pressure regulator that reduces the constant pressure to 55 PSI. The gauge is on the output side of the regulator and indicates a constant pressure of 55 PSI whether the water is moving or not. I could for see all sorts of issues with coach plumbing if I allowed a constant pressure of 105 PSI to enter the coach.
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Bob Retired Army Traveling alone now, had to put Charlie the Beagle down :(.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2020 1500 GMC Sierra Denali 4x4 Crewcab
Western MT in summer, AZ, NV in winter
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12-04-2012, 08:50 AM
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#4
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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Cheap insurance... One of the first things we bought...
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Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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12-04-2012, 08:51 AM
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#5
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Senior Member
Join Date: Jul 2011
Posts: 792
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Pressure regulators control pressure. If your theory was correct you would notice a surge when you first turned on your faucet. My regulator is hooked up at the faucet end of the hose so if the regulator allowed high pressure in without water flow I would notice a surge when first turning on a faucet in the RV.
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2011 Itasca Suncruiser, Jeep Grand Cherokee toad
MSgt retired USAF 1988, AA retired 2005
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12-04-2012, 09:30 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Mar 2012
Location: Angola State Prison - Murder
Posts: 4,230
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There are water restrictors, which many mfgs have used on MHs over the years. These are just flow restrictors and can mimic a pressure regulator when the faucet is turned on. But when turned off, if there is 100psi on the line, that will also be in the coach.
I took my restrictor off and put on a Watts pressure regulator. Now the coach only sees 50psi regardless of park pressure.
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John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
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12-04-2012, 10:04 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jan 2011
Location: Huson, MT
Posts: 1,043
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Craig & Donna
2005 Beaver Monterey Laguna IV (aka The Hotel Monterey)
2011 Jeep Liberty Limited
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12-04-2012, 11:43 AM
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#8
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Quote:
Originally Posted by clyon51
There are water restrictors, which many mfgs have used on MHs over the years. These are just flow restrictors and can mimic a pressure regulator when the faucet is turned on. But when turned off, if there is 100psi on the line, that will also be in the coach.
I took my restrictor off and put on a Watts pressure regulator. Now the coach only sees 50psi regardless of park pressure.
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Interesting!
There is a physics principle and an associated equation that make this confusing:
1. Pascal's principle: The pressure applied at one point in an enclosed fluid under equilibrium (static) conditions is transmitted equally to all parts of the fluid.
2. Bernoulli's equation: The sum of the pressure, the kinetic energy per unit volume, and the potential energy per unit volume have the same value throughout the pipe.
I wonder how a Watts regulator actually decreases pressure. It must not be a constrictor.
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12-04-2012, 12:03 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Mar 2012
Location: Angola State Prison - Murder
Posts: 4,230
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It uses a spring on a valve. If you want to allow more pressure in, you relieve pressure on the spring. If you want to decrease pressue you put more pressure on the spring.
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John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
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12-04-2012, 12:12 PM
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#11
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Quote:
Originally Posted by TN Bill
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Hey, thanks.
Now that makes sense! Watts it is for me.
Hope everyone else realizes that a simple constrictor does NOT reduce static pressure!!!
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12-04-2012, 02:39 PM
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#12
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Senior Member
Workhorse Chassis Owner
Join Date: Feb 2005
Location: western wa.
Posts: 563
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ok guys, which watts do you use?
seems to be alot of numbers out there.
thanks, dave
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2018 Jayco redhawk E 22
chevrolet express 4500 chassis
6LT
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12-04-2012, 02:51 PM
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#13
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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This is how I did mine with a watts 3/4" regulator, mounted in wet bay. Guages for incoming and pressure to the coach. Work really well. Bought all the stuff at lowes.
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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12-04-2012, 03:22 PM
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#14
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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IF you only park in one park, Your logic is good but your plan sucks.
If you move about...Well some numbers.
The two parks I summer at run 50-55 PSI max
My House, when I had one, 80
The spot I'm typing in as high as 120 PSI
The seals on the flush valve for the some toilets are rated Sixty
your flow restrictor does NOTHING to lower the static system pressure, it does make taking a shower less pleasant.
A WATTS "whole house' regulator, at least 1/2 inch with hose adapters, if working properly, WILL control the pressure.
It won't sreriously restrict the flow though so the shower is still good.
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