Industrial valves - Actuators - Part 4: Hydraulic part-turn actuators for industrial valves - Basic requirements; German version EN 15714-4:2009— 26 стр.
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges; German version EN 1092-1:2007— 130 стр.