Thanks, the reason I wondered about that is because there are some CGA580 valves with a burst disc, where AFAIK CGA580 is only for noble gases and mixtures of noble gases with CO2.Handling Cylinders
BOC gas cylinders are designed and constructed in accordance with national and international standards and specificationswww.boconline.co.uk
granted thats for us UK folk , maybe your local regulations may be different , but burst discs are on fuel gas cylinders only , and even then its only on lower pressure cylinders ,,
I guess as you mentioned this has something to do with variying regulations.