I would have your friend in the trade have a look at it, If he or she is in the trade and are going to do the work anyway they will be able to get you the valve you need and will know the best parts source in your area.
Alot of folks here tend to shy away from giving advice on Gas valves and gas line installation to non-pro's due to the dangers involved( I am one of them).
Geester what type of Engineer are you?
Bill