Based on my 8 years of experience in Oil & Gas industry I can claim that you can find here All what you need to know about Valves. This is an introduction to understand more about their:- - Classification. - Selection - Most common Types. You can find also more at: http://hassanelbanhawi.com/staticequipment/valves All the data and the illustrative figures presented here can be found through two reference books:- ENGINEERING DATA BOOK by Gas Processors Suppliers Association Process Technology - Equipment and Systems by Charles E. Thomas Thank you.