VIR butterfly valves ref.4000 WAFER type are suitable to most of HEVAC and Industrial systems and have different body options: cast iron or ductile iron or epoxy coating.
The inner disc is ductile iron made or stainless steel made with EPDM or VITON seats and O-rings upon request.
The stem is always stainless steel made.
The ISO5211 plate suitable to electric or pneumatic actuators.