Truma Pressure Relief Valve Leaking

[MAX Burner]

14 hours ago, jd1923 said:

Before every trip, I fill mine at home where house pressure is known.

Same here.  We use our FWT exclusively for our water needs, as mentioned in other threads.  Filling at home with a known pedigree of our (delicious) well water is standard practice for us.  Granted, D still filters the well water through a Travel Berkey, but she does the same thing at home with the Big Berkey -- works out fine for our style of camping, FYI.

[John and Debbie]

On 1/1/2025 at 8:15 AM, Rich and Jane Walker said:

Thanks to both for the information. I will go out and get a regulator today. Appreciate the help! Greetings from LeFleur Bluffs State park!

I believe Oliver provided a pressure regulator with the supplies that came with the trailer.  I have the regulator with the dial also, but use the regulator that came with the trailer.  It's a piece that's about 3-4 inches long that regulates to 40psi.

John

[dewdev]

On 2/15/2025 at 12:24 PM, John and Debbie said:

I believe Oliver provided a pressure regulator with the supplies that came with the trailer.  I have the regulator with the dial also, but use the regulator that came with the trailer.  It's a piece that's about 3-4 inches long that regulates to 40psi.

@John and Debbie John:

I believe what you are calling a pressure regulator is actually a backflow preventor. There are two backflow regulators located just under the floor board in the rear storage compartment. They are adjacent to the Fresh Water Connection and another one just adjacent to the City Water Connection. The blackflow regulators can be seen on the plumbing drawing in the 2022 Owner's Manual on the Oliver University page. Check out the drawing to see if that is what you are referring to.

A backflow regulator does not regulate pressure.

@Ronbrink @John and Debbie I stand corrected; see Ronbrink's post listed below.

Edited Monday at 09:56 PM by dewdev

[Geronimo John]

On 2/14/2025 at 4:05 PM, jd1923 said:

I truly enjoyed your post, but I would just increase the pressure and blow those LBs out! 🤣

Seriously though, every Oliver owner should know this line is clear, since every time we fill the tank until it overflows and pressure cannot build in an open system. Before every trip, I fill mine at home where house pressure is known. We have an adjustable regulator in the basement.

Oh boy, this response is going to be a lot of fun.

Pressurization of our fresh water tank (FWT) can be realized with well or city water lines. The above post and response is one way.

However, the Poly water tanks I am aware of are not rated pressure tanks. It is for this reason that 99% of them do not post a working pressure rating.  But that does not prevent some people thinking otherwise.  Ok, so lets assume you are filling your FWT with a non-functioning vent.  And you "increase the pressure and blow those LBs out!"   What would happen if you did?  Actually this has been done, tested, and documented.  The results are always the same.  One such test report can be found at:    

https://blog.polyprocessing.com/blog/tank-pressurization-and-your-chemical-storage-tanks-service-life

Here is a short version: 

"Poly Processing performed a test to failure with XLPE vs HDPE. We pressurized both tanks with water to the point of failure. The linear polyethylene tank catastrophically failed at 9 psi of water pressure. The cross-linked tank failed at 10 psi.    

So this is likely why OTT has very large FWT vent hose and separate ports for boon docking and FWT Fill.  The Boondock line is not designed to be hooked up to a pressure system (ever).  The Fresh Water Fill is a direct path to the FWT and it has an oversized vent.  Just be careful to slow down the fill rate as you approach a full tank.  

Oh, and I recommend to not never use a "Bigger Hammer" just cause you can. It generally gets the job done, but with unintended results.....   

Ouch!  Gotcha!   LOL

GJ

 

 

[jd1923]

7 hours ago, Geronimo John said:

And you "increase the pressure and blow those LBs out!"   What would happen if you did?

I was joking! 🤣

[Ronbrink]

On 2/15/2025 at 11:53 AM, dewdev said:

I believe what you are calling a pressure regulator is actually a backflow preventor.

Actually, I too had a small pressure regulator supplied upon delivery as @John and Debbie described, and it does look very similar to the back-flow preventer you mentioned. I used it a few times and still carry it as backup, but reverted to the Valterra adjustable regulator with a gauge. The supplied regulator is similar or same as this:

 

Edited Monday at 12:39 PM by Ronbrink

[jd1923]

4 hours ago, Ronbrink said:

Actually, I too had a small pressure regulator supplied upon delivery

Yep, though it's better to call these water restrictors. They restrict flow vs. regulate pressure. Ron's choice of a true adjustable/gauged pressure regulator is what you want. I've posted this picture before, but to show our hull came with BOTH restrictors and back-flow preventers (check valves) on both incoming water lines. However, the OTT plumbing diagram shows only back-flow preventers. There are likely several configurations out there!