Mounting an Offset Rotary Valve to a WSM


 

Jim P.

TVWBB Fan
I recently aquired a new HeaterMeter and an Offset Rotary Valve. To make a long story short, due to some limitations on my end and to make sure everything actually worked, I contacted forum member Jas E to see If he could assemble a new HeaterMeter set-up for me. He could, he did, and I couldn't be happier. The whole process went perfectly from start to finish. Thanks again Jas.

Now that I had my new HM it was time to learn how to use it. Lots of reading of this forum, the GitHub Wiki, watching YouTube, and test of my new unit ensued. I haven't done that much homework in a long time. Well worth it though. One of the things I needed to accomplish was to get my blower attached to my WSM. After much searching around and not finding exactly what I wanted but getting some ideas, I tried to figure out something for myself. My requirements were that it had to be a simple design and it had to be easy to put together with a minimum of tools. Did I mention it had to be easy?

This is what I came up with.
wsmhm6.jpg


I ended up using a universal weber adaptor from BBQ Guru. Not a perfect solution but I will see how it goes for several cooks. The most difficult part of the whole build was fitting the copper fitting into the stainless adaptor. The id of the adaptor is not a standard size, the 1" side of the copper fitting was too big and the 3/4" was too small. I bought some o-rings to try to make a tight fit. Unfortunately the o-ring would not stay in place when I was trying to press fit the pieces together. My inelegant solution was to score the copper fitting with a pipe cutter just enough to give the o-ring enough bite to not slide up the fitting. To my utter amazement it worked! It has even stayed in place as of this post. More experimentation might be in the future. The rest of the build is just two 90 degree, 1" to 3/4" copper adapters. Everything is just press fit together for easy disassembly. Not at all because I don't want to solder anything. There aren't any air leaks that I can detect. So far, so good.

A couple of more pics.

If you look closely you can see the black o-ring in the adaptor.
wsmhm2.jpg


Disassembled.
wsmhm3.jpg


Onto make some great smoked food. I can't wait!

Jim
 
You could also get a small piece of nomex gasket material and wrap that around the copper. Definitely would not melt. Just an idea.
 
Bob's nomex idea sounds like a much better solution, having a rubber o-ring that close to your heat source sounds like a bad idea to me.... rubber and fire don't go together well...
 
Thanks to all for taking a look at and commenting on my design. I was quite happy when first testing and it worked! Not having a lot of technical knowledge led to several trips to Home Depot to test fit various parts to see what would work. Looking at other designs here also was very helpful.

As for the o-ring issue I also was concerned about high temps and melting. During testing I made a point to check the temp of all of the pieces of the unit. To my surprise the highest temps I measured were right around 100 degrees. That was after long periods of the blower being off with the pit temps running over 325.

Having said that I am definitely going to be looking into the Nomex solution. I don't know why I didn't consider that route originally. The only reason I can think of is I was so focused on getting the adapter working with the o-ring I was blind to everything else. Especially since I had some extra Nomex and food grade RTV adhesive sitting in front of me which was left over from a just installed gasket kit. Doh! Onto more testing.

So thanks again for all of your comments. They have been quite useful. And Ralph, the only other modification I am considering is an airburner if the adapter doesn't provide enough air flow. If anyone else has any ideas or comments, let me know.

Thanks again.

Jim
 
Another possibility might be the plumber's blanket from the hardware store, used when sweat soldering copper pipes close to something flammable.
 

 

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