Dometic 320 water valve

I have a two year old Dometic 320 and it works great. I have a 2 gallon bladder tank at the pump and ive foam wrapped and anchored all the waterlines that I can get to. I hear the 320 water valve thump when it closes but no line rattle whatsoever. There are much better hammer arrestors than that Oatey. I’ve used some that were scaled down bladder tanks, about the size of a pint jar that I bought from commercial plumbing suppliers. Craig

Cummins12V98 wrote:

TXiceman wrote:
We tried a Dometic 320 and it was a piece of junk. Took it out, returned to dealer and got the parts to repair my old Thetford.

Ken

Curious as to what about it made you think it was a "piece of junk" ???

With proper water pressure and flow it would not sweep the bowl and you had to use the hand sprayer. After I got online looking for a resolution, I found it had problems with the pedal breaking and leaks as well as very limited parts were available. Basically, it is a throw away item.

Ken

ChuckSteed wrote:
If the water pressure is good (you are using a pressure regulator)... not a Camco piece of junk.... then replace the valve

And if you let that foot pedal snap up hard you WILL sooner or later crack the pedal mechanism and be buying a new toilet...

The pedal did break so I bought a 5/8" rod ABS spun it down to fit in the part glued it in.

TXiceman wrote:
We tried a Dometic 320 and it was a piece of junk. Took it out, returned to dealer and got the parts to repair my old Thetford.

Ken

Curious as to what about it made you think it was a "piece of junk" ???

We tried a Dometic 320 and it was a piece of junk. Took it out, returned to dealer and got the parts to repair my old Thetford.

Ken

Look up Wellxtrol WX-101 (140PR1), 2 Gal WELL-X-TROL In-Line Well Tank

You can get for under $100.

Cummins12V98 wrote:

rhagfo wrote:

ChuckSteed wrote:
If the water pressure is good (you are using a pressure regulator)... not a Camco piece of junk.... then replace the valve

And if you let that foot pedal snap up hard you WILL sooner or later crack the pedal mechanism and be buying a new toilet...

I doubt that replacing the valve will have much effect. I close the valve slowly, but still get a bit of hammer.

The real issue is that there are no built in air chambers in an RVs plumbing. I would suggest, and will likely buy one of these Hammer Arrestor. Simply replace an elbow with a Tee and install the arrestor.

That is a cheap first try. If that does not work a small expansion thank should do the trick.

Are you talking about the tank like the one on the water pump?
Den.

rhagfo wrote:

ChuckSteed wrote:
If the water pressure is good (you are using a pressure regulator)... not a Camco piece of junk.... then replace the valve

And if you let that foot pedal snap up hard you WILL sooner or later crack the pedal mechanism and be buying a new toilet...

I doubt that replacing the valve will have much effect. I close the valve slowly, but still get a bit of hammer.

The real issue is that there are no built in air chambers in an RVs plumbing. I would suggest, and will likely buy one of these Hammer Arrestor. Simply replace an elbow with a Tee and install the arrestor.

That is a cheap first try. If that does not work a small expansion thank should do the trick.

ChuckSteed wrote:
If the water pressure is good (you are using a pressure regulator)... not a Camco piece of junk.... then replace the valve

And if you let that foot pedal snap up hard you WILL sooner or later crack the pedal mechanism and be buying a new toilet...

NOT on this model. I have used mine full time since May 2105. I am a release and snap kinda guy!

The down side to the earlier models is the ball can crack and then you are buying a whole new toilet! NOT a replaceable item. Mine did crack but kept it working until last year with various glues until I finally caved in and bought a new unit.

ChuckSteed wrote:
If the water pressure is good (you are using a pressure regulator)... not a Camco piece of junk.... then replace the valve

And if you let that foot pedal snap up hard you WILL sooner or later crack the pedal mechanism and be buying a new toilet...

I doubt that replacing the valve will have much effect. I close the valve slowly, but still get a bit of hammer.

The real issue is that there are no built in air chambers in an RVs plumbing. I would suggest, and will likely buy one of these Hammer Arrestor. Simply replace an elbow with a Tee and install the arrestor.