17
Competence in Functional Safety
Functional safety of globe valves, rotary plug valves, ball valves and butterfly valves
Responsibility
Media, especially degreasing, swelling and fibrous media, may affect the torque.
The operating conditions, e.g. switching interval and the medium temperature, have
an effect on the torques.
The mounting of the valve and actuator is of vital importance.
The permissible torques for the butterfly valve shaft, shaft adapter and bridge have
been verified by the manufacturer. As a result, the max. torque of the actuator
(air
or spring torque
) must
not
exceed these torques under any circumstances.
The corresponding specifications in accordance with DIN EN ISO 5211/DIN EN 15081
(NAMUR Recommendation NE 14) must be observed. See section 5.3 on ball valve
requirements.
Operator
Manufacturer
