Functional Safety of Globe Valves, Rotary Plug Valves, Ball Valves and Butterfly Valves - This manual is intended to assist planners and operators during the integration of control valves into a safety loop as part of the safety function and to enable them to safely operate control valves. This manual contains information, safety-related characteristics and warnings concerning the functional safety in accordance with IEC 61508 and concerning the application in the process industry in accordance with IEC 61511 - from Samson Controls.