Originally Posted by HopSong
A needle valve is just that. Simply a valve. This is a secondary valve that throttles the gas at the burner. However.. it does nothing to supply the proper mixture and volume at the burner. He needs some info on where to purchase or how much to enlarge the orifice on his current burner.
My suggestion would be to go >> HERE
<< It is a slightly different discussion.. but, has a lot of pertinent information.
Right, sorry I wasn't really referring to the needle valve as an orifice. I meant that Blichmann sells a kit with the proper orifice and a needle valve. It looks like he has the needle valve from the kit, so I assume he has the proper orifice as well since it's included in the kit. I was trying to say that maybe the supplier included the wrong orifice in his NG conversion kit.
Here's the kit I'm referring to for the Blichmann Burner NG conversion kit. http://www.midwestsupplies.com/blichmann-natural-gas-conversion-for-toptier-floor-burner.html