multi selection manifold

Dear all,

Can anybody throw some light on multi selection manifold/valve now a days used in place of convention test manifold and production manifold.What are the testing requirement,codes available,who all are the major manufacturers etc.Discussion or opinion on this will be highly appreciated.

Warm regards,
sandcauli

[Non-text portions of this message have been removed] Received on Fri Oct 05 08:00:00 2007