DIN EN 50216-8:2007 Power transformer and reactor fittings - Part 8: Butterfly valves for insulating liquid circuits; German version EN 50216-8:2005 + A1:2006
EN 1092-1:2001 Flanges and Their Joints - Circular Flanges for Pipes, Valves, Fittings and Accessories, PN Designated - Part 1: Steel Flanges
DIN EN 50216-8:2007 history
2007DIN EN 50216-8:2007 Power transformer and reactor fittings - Part 8: Butterfly valves for insulating liquid circuits; German version EN 50216-8:2005 + A1:2006