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· 02/06/2020 7:24 AM
Searched but no can find, but does anyone on here use the roasters made by CRC (Coffee Roasters Club) in Connecticut?

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Proportional Solenoid or Needle valve?
allenb
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)

https://www.amazon.com/GEREE-Adjustab...B019YXLWZA

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
 
CoffeeInterest
Allen,

Would something like this work with the adjustable DC supply you linked?

https://www.ebay.com/itm/HFS-12V-Dc-1...:rk:1:pf:0
 
BobbyS
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.

SPECIFICATIONS:
• 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
 
CoffeeInterest
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.
 
allenb
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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