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Old 10-23-2018, 12:32 PM   #1
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2016 23' Flying Cloud
Fanwood , New Jersey
Join Date: Sep 2016
Posts: 196
Water pressure regulator used to regulate air pressure?

I have no idea how a regulator works, but we always put one between the trailer and the water filter when we have water hook-up even though we were told that our 2016FC23D is equipped with its own water pressure regulator.


Anyway, can I use the same regulator to regulate air pressure when we do winterizing?


Would the regulator protect the lines from over pressurization?


Thanks,


Atsushi
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Old 10-23-2018, 12:38 PM   #2
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2017 30' Classic
2022 Interstate 24X
Carlisle , Pennsylvania
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Hi

A water regulator *might* work with air, but there are no guarantees. I assume you are headed off to blow water out of the lines. The proper approach is to get a legit air regulator (and air filter) to do the job.

Most compressors that are big enough to do a good job at blowing out the lines have a tank and regulator on them already. A reasonable one is a sub $100 item at Lowes or Home Depot. A bigger one is still under $200. They plug into 120V power and are designed for heavier duty use than a tire inflator.

Bob
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Old 10-23-2018, 12:46 PM   #3
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Water and air pressure regulators work in a similar manner. They have a spring that presses on a rubber diaphragm inside the housing. The diaphragm moves a valve in the body that lets water or air into the chamber under the diaphragm. As the pressure under the diaphragm increases, the spring compresses, and the valve closes when the pressure under the diaphragm is greater that the spring pressure. The spring is adjusted by a bolt or knob that is a part of the regulator. The output of the regulator is from the chamber under the diaphragm. When you draw water or air out of the chamber, the diaphragm releases the pressure holding up the spring, and the spring moves the diaphragm down to open the valve to refill the chamber.

I do not think a water pressure regulator will regulate air pressure correctly. The valve and its orifice may not seal tight enough with just air in it. Usually air compressors have their own dedicated pressure regulator, so the way to use it is to set the air pressure from the compressor to be to no more than 50-60 pounds, which is the maximum pressure rating for the Airstream plumbing system.

BTW, the best place for your campground water pressure regulator is at the campground water spigot, then connect your hose and filter to the output side of your regulator--that also protects the hose against overpressure and possible bursting...
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Old 10-23-2018, 12:56 PM   #4
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Thanks guys!
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Old 10-24-2018, 09:24 AM   #5
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2005 31' Classic
Gretna , Nebraska
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Thanks!

I have wondered about this issue.

Thanks for answering, and for the discussion of how regulators operate.

Dwight
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Old 10-24-2018, 03:21 PM   #6
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2002 25' Safari
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So I have to beg the question...has anyone ever tried to hook up the air to the regulator water inlet side?....this would seem to simplify the process of properly draining the system. Hope to try this and see what happens.

Thx for your input.
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Old 10-24-2018, 03:45 PM   #7
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Quote:
Originally Posted by ednmarian View Post
So I have to beg the question...has anyone ever tried to hook up the air to the regulator water inlet side?....this would seem to simplify the process of properly draining the system. Hope to try this and see what happens.

Thx for your input.
Thats how I would do it, I think the question was more about whether or not that reg would regulate the incoming air pressure.
As said most any compressor will already have a regulator on them so throttle it down to 40 or 50 psi and go to work.
You will want to have fixtures open anyway so over pressure is not likely.

I just had the unpleasant experience of air blowing and flushing the water system of a nine bathroom house that the water softner failed on sending resin throughout and plugging up nearly ever fixture in the house. 45 hours later it's all clear from the 62 seperate outlets within the house.
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Old 10-26-2018, 06:06 AM   #8
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Oil>water>gas

This is the one I installed on my water pressure regulator.
The reg was adjustable but didn't have a gauge...

Bob
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Old 10-26-2018, 07:16 AM   #9
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Most of the cheap water pressure regulators regulate flow not pressure. If you turn off all the faucets, the pressure will rise. Your trailer should have a good one but they can get dirty and bypass pressure as well. Pressure is the enemy. Best to have a gage on the water line down stream of the regulator. You want to stay below 60 psi.



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