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Old 01-11-2018, 09:18 AM   #1
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Location: Hewitt, Tx
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Quick question regarding water pressure

I don't know why, but for some reason in my mind I have 55psi as the max pressure I should allow for incoming water from the city water connection. Can anyone confirm this off the top of their head?


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Old 01-11-2018, 09:20 AM   #2
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I've always been told 40.

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Old 01-11-2018, 09:31 AM   #3
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Don't have a real answer for you but most of the pressure reducer fittings I've seen, and use, regulate the pressure between 40 and 50 psi.
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Old 01-11-2018, 09:53 AM   #4
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50 psi not enough pressure for a decent shower. I use a pressure regulator and set as I need.
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Old 01-11-2018, 01:40 PM   #5
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Definitely want to invest in a water pressure regulator. It's a small investment for your large investment. I just looked at one,,,$12.39
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Old 01-11-2018, 01:47 PM   #6
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I do have one. I have been using the cheap camco one most people use. I recently purchased an expensive adjustable regulator to try to increase the pressure to improve my showering experience. Hahahaha

Just trying to figure out how high I can set it with enough tolerance to not damage any components.
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Old 01-11-2018, 01:54 PM   #7
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My regulator was preset at 55 psi which, if the park has that high, makes for a good shower. Most parks have very low pressure, in my opinion, but we've been to several that have had 80+psi & a real regulator was required.
Pex piping is rated at 100+/- psi but not sure about the plastic fittings.

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Old 01-11-2018, 03:14 PM   #8
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I've seen different views on max pressure coming into the RV. I had heard 40 psi., 50 psi and even up to 65 psi. I don't think pex cares about any of those numbers but I do worry about all the connections. I ran 135 psi thru our house in the mountains with pex and had no problems (for a short period) but our connections there are much more robust that those in the trailer.

I used the non adjustable type on the RV for a while but it is just not acceptable. We found that water pressures in RV parks seem to be pretty much regulated any more.....way regulated to about 40 psi....maybe. Then, when there is high usage you're lucky to get enough to make a shower head work. When adding the non adjustable regulator it knocked the pressure down no matter what. What might have been a weak flow would be decreased to maddeningly slow. It did come in handy in those few places that had high pressure -all you have to do is turn on the spigot and you can tell 40-50 psi from 100.

We now use an adjustable pressure regulator and voila'! things work no matter where we go. I would highly recommend one if you are using the non adjustable type like you buy at Walmart.
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Old 01-11-2018, 05:11 PM   #9
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We use an adjustable regulator. Had a Valterra one that developed problems with flow, forgot it at a park in Wyoming, so no loss. Bought a better Watts regulator at a hardware/plumbing supply store, along with fittings to connect to hose ends. It regulates the pressure much better and with the larger adjustable regulators, you get the better water flow, which is the downside to the cheap fixed regulators for RVs. I went with a LFN45B model with 3/4" threaded ends that I could thread the hose fittings onto. Works great. http://www.watts.com/pages/_products...s.asp?pid=6807
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Old 01-11-2018, 05:31 PM   #10
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I'm no plumber, so someone jump in here if I don't explain this correctly. "Satisfactory shower head performance" depends on two factors. First is pressure. Typically any pressure greater than about 35 or 40 PSI is suitable. The second, and just as important, maybe even more important is volume. If you don't have sufficient volume of water flowing through the pipes, it will just trickle out of the shower head no matter if the pressure is 40 or 80 PSI.

Now, most "non-adjustable" tube type (CHEAP) pressure regulators, the $5 plastic ones and the $10 brass ones, usually restrict water flow so much that the volume of water flowing into the trailer is less than 3 or 4 GPM. That sounds sufficient, but when flowing through a 25' half in hose, into the city water connector, through several valves, fittings, being split so half goes to the cold water side and the other half goes to the hot water side and is further restricted by the valves there, it doesn't take much volume reduction to make an otherwise suitable shower turn into a "dribbler".....

I'd suggest getting a good, high volume pressure regulator, one that flows 6 or 8 gallons per minute and adjust it to 40 PSI. You'll likely see a much improved shower experience with a quality shower head. Oh, and don't think that Keystone installs quality shower heads in most of their trailers. A trip to an RV store for an Oxygenics head will almost always bring a smile in the shower.

Think of it this way. Aupply 400 PSI of water pressure through a "pinhole" at the faucet, connect a 25' hose and all you'll get out the other end is a dribble. Now, increase that pinhole to a 1/2" hole and you'll get enough pressure at the other end of the hose to knock the decals off your trailer..... It takes both pressure AND volume to be "workable" for most open ended water functions such as a shower head.


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water, water pressure

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