Hi all masters,
I've been reading around to collect knowledge on these new terms by API 6D, DBB and DIB valve. some of them used DPE valve (double piston effect).
in this, there are lots of experts here, so i would like to have some discussion on this.

1. Could someone could explain the pro and cons for these valves? DIB and DBB (as per stated in API 6D)

2. DBB what is normally used is a configuration of 2 valves with a bleed. how to differentiate between DBB as per API and DBB valve configuration.

3. with DIB now used in API, is there any live evidence that the configuration is really work? For high pressure application such as 900lb and above, is the DIB valve can with stand to handle the pressure if one the seat is leaking?

4. currently in market, DBB plug valve and DBB gate valve is call the DIB. what is the similarity of these 2 valve with new API 6D DIB ball valve?

Hope to have some nice discussion regarding this matter.