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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Electric and Gas Heat Sources

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Proportional Solenoid or Needle valve?
allenb	#1 Posted on 01/28/2018 11:30 AM
Administrator Posts: 3725 Joined: February 23, 2010	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.amazo...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	#2 Posted on 11/26/2018 10:23 AM
Newbie Posts: 16 Joined: November 23, 2018	Allen, Would something like this work with the adjustable DC supply you linked? https://www.ebay....:rk:1:pf:0


BobbyS	#3 Posted on 11/26/2018 11:22 AM
1/4 Pounder Posts: 179 Joined: July 02, 2011	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	#4 Posted on 11/26/2018 11:54 AM
Newbie Posts: 16 Joined: November 23, 2018	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	#5 Posted on 11/27/2018 7:12 PM
Administrator Posts: 3725 Joined: February 23, 2010	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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