NBN EN 12570:2000

This EN specifies the requirements for establishing the minimum size of the operating element supplied with an industrial valve regarding the force applied by one person to operate the valve under specified working conditions. This standard applies to manual operating elements of sizes from 100 mm to 1000 mm: - directly mounted on valves; - mounted on valve reduction gearboxes; - used for manual operation of power actuated valves. This standard does not apply to: - impactor handwheels; - T-keys; - chainwheels.