I would be happy to help if I could I've made a couple using information from my mentor Tim Hancock, Wayne Coe and Eric Fleming. Here's a shot of my two, as they say a picture is worth a 1000 words.
There's a constant flow controlled by the lower needle valve I try to keep that one just below my target temp. The second needle valve controls the solenoid, that one is on fairly low dependingon what I'm doing.