Jon Tofte
TVWBB 1-Star Olympian
I had to do a NG to LP conversion - swapping out the orifices with the Whirlpool supplied LP ones - when we went from electric and installed a gas range (that I guess now they want to ban!). I think it has to be that the valves are "continuous" for a gas range. (I also think the owner's manual had so many warnings from Whirlpool that unless you brought in a licensed technician to swap the orifices Whirlpool would cite your failure to comply with their instructions.I think it's because other than the orifices themselves, the gas valves are the same no matter LP or NG. I think it's pretty clear in all the cases of Weber gas grill conversions gone wrong that it's not the same case with these Weber valves.
I believe Broilmaster grills, at least the older ones, had the same kind of continuous valves, so they were happy to sell you to swap the orifices. As Larry has noted in some discussions, some Weber grills have continuous valves, while some don't. Without taking them apart you would be very hard pressed to know.