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Proportional Solenoid or Needle valve?
For those who prefer dealing with electronics versus plumbing in a needle valve and want to manually control the gas pressure to your burner, there's an option for you if you haven't already thought of it.

Build or buy a 3 terminal adjustable DC supply to control a 0-10 volt proportional solenoid (Kelly, Clippard, Humphrey)

Mount the dc supply with the pot mounted to the front of your roaster and a good pressure gauge nearby and you're set to go. You'll still want to choose the orifice size correctly for your proportional solenoid so you have smooth control while varying the 0-10 volts. The smallest available will suit most builds up to 5 lb batches (.009" to .025") I wouldn't go over .025" unless you'll be using a BBQ style regulator with low pressure output. If you use one of those, you'll need to do a BTU calculation to make sure you choose the best orifice size.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana

Would something like this work with the adjustable DC supply you linked?
Not trying to butt in, and I hope I am not, but I looked at your link and noticed this:

in the info on the page for that it says "not For Flammable Liquids or Gas. It is not explosion proof.

I see there is conflicting information on that page. Might need to contact the seller and see if they have one for what gas you are going to use.

• 110V AC
• Working Pressure: 0-100PSI (7Bar)
• Normally Closed (Opens when powered)
• Semi-Direct lift valve. Suitable for gravity feed.
• Temperature Range: 23F to 176F
• Orifice: 16mm
• Length: 2-3/8"
• Width: 2"
• Height: 4"
• 1/2"NPT Both Ends

WARNING: Not for use with flammable gas or liquid. This valve is NOT explosion proof.
Edited by BobbyS on 11/26/2018 11:32 AM
Good catch on this BobbyS.

I'll dig around on the site and see if I can find a specific valve from one of the brands mentioned in the OG post.
The solenoid you linked to is not a proportional solenoid that can modulate but is a simple on/off solenoid.

The proportional valves we've found that can be purchased fairly easily are made by Kelly and Clippard.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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