Why not high pressure???

Looking to finish my single tier build and I am wondering why everyone uses low pressure? Looks like all the solenoid valve operating pressures range from 0-120psi. Must BG-14 are only around 20-40 psi. So why go low pressure and drill everything? Please help before I go the wrong direction.

i think people use low pressure so they can use selenoid valves and controllers on theyre burners. I could be wrong

it's so you can utilize home furnace valves, like this. They allow you to automate the entire burner sequence, from pilot ignition to full burner to off. The valves operate at 1/2PSI, so you have to use low pressure LP with them.

wow that would get expensive to controll 2 or 3 burners.....

If you go the low pressure route then standing pilot furnace valves are about $63, a pilot burner $18, and thermocouple $4. If you want maximum bling then the electric ignition method is the ticket.
If you buy new brass ASCO solenoid valves for the gas to the burners they run more than the furnace valve setup and offer no safety cutoff.

The part numbers to look for are;
Honeywell VR8200 valve http://www.pexsupply.com/Honeywell-VR8200A2132-1-2-24-Vac-Standing-Pilot-Gas-Valve-11588000-p
Honeywell Q314 pilot burner http://www.pexsupply.com/Honeywell-Q314A4586-Honeywell-Q314A4586-Pilot-Burner-4113000-p
Honeywell Q390 Thermocouple http://www.pexsupply.com/Honeywell-Q390A1046-24-Thermocouple-1721000-p

Do you have any pictures of your gas setup?? Also what size pipe did you use?