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Another Propane Gas Control Method
It looks like this may be a way to control this valve. OTOH, is the noise I'm hearing coming from the valve and is it very loud? If yes, I think I would go back to 1/sec with the pulse dampening you've got now and see if it's less abrupt on pulsing. It would be a lot easier on the valve.

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
Hi Russ,

I'm thinking about designs for a new drum roaster build. My current drum roaster is all manual and for the new build, I want to add various levels of automation. I really like to concept that you have demonstrated here! Have you had a chance to actually test this gas setup with a roast? I'm curious to see how well it works in practice (eg. Are you able to closely follow a defined roast profile).
Thanks Klix!

Unfortunately, I've been buried under a contract job for the last few months and haven't had time to work on the roaster.

In theory, the automated gas control scheme I'm testing should offer good control once the variables (combustion air intake flow, flame stability at different exhaust air / fan speeds, etc.) are accounted for. But I can't say for sure until it's actually browning beans 'on profile'.

My hope is that you, or anybody else can take some of these ideas and improve upon them for your own control setups.

Hi Russ,

Hopefully you get some time to continue work on your roaster! This thread amongst others has certainly inspired me and has given me some good ideas. I am currently trying to source some parts and I'm having a hard time finding the clippard valve that you used in your setup (ET-2-12-H). I cannot find anyone on eBay with the -H version and the clippard site says out of stock. Can anyone recommend an alternative? I have been looking online and many of the similar valves that I have found are either costly or just not right. Any help to either source the same valve or something similar would be appreciated.

Hey Klix,

I got lucky when searching eBay for mine. The "H" designation never turned up in search titles or descriptions, I had to look for it in the product photos.

I did find one in a eBay search this morning that includes a digital pressure gauge.

Here's the listing: http://www.ebay.c...26_rdc%3D1

Lylabrown attached the following image:
Can someone point me out where to source the manifolds and the needle valves to build a propane gas control like this one?.

check here or search the internet...



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