We would like to size and select API526 and EN4126 valves within our company and not rely on the manufacturer only. Hope this answers your question sufficiently. We work with PetroChem and Pulp&Paper clients.
thank you for your kind replies. maybe I should be more specific. We would prefer to buy a software package to size safety valves for our own use. we don't want to use a specific manufacturer's one. thanks again for your replies.