The Type 365 shall be a lug style butterfly valve rated for bidirectional use and dead-end service.  The disc material shall be PFA encapsulated stainless steel.  The disc and shaft shall be single-piece stainless steel and blow-out proof.  The disc liner shall be constructed of virgin PTFE material with a minimum thickness of 3mm.  All PTFE seals shall utilize a non-wetted elastomeric backing.  The body shall be of a two-piece design, constructed of ductile iron with a polyester coating.  The shaft bearings shall be self-lubricating.  The shaft seals shall be of virgin PTFE material construction and Belleville disc springs shall compress these seals against disc hubs with a uniformly distributed load through pushers on both sides of the disc.  Flange bolt patters shall comply with ANSI B16.5 class 150 standards. All valves shall be cleaned and double bagged in a class 10,000 cleanroom.  All valves shall be rated for bubble-tight shut-off.