Valve attachment
12
4
Valve attachment
This section deals with mounting the actuator on a valve, while detailing the specialit-
ies of the different version. Always check the actuator for damage first. Replace dam-
aged parts by original spare parts.
DREHMO actuators can be mounted in any position. Mounting is easiest if the vertic-
ally fitted valve shaft is freely accessible. To fix the DREHMO actuator to the final ele-
ment (valve), threaded holes are provided at the actuator mounting flange. The dimen-
sions of the actuator mounting flange with output drive types comply with
ENISO5210 (multi-turn actuators) or ENISO5211 (part-turn actuators) standards.
4.1
Handwheel operation
Both actuator or valve can be operated manually at any time via the handwheel in
case of power failure. Switching between motor operation and handwheel operation is
not required. Clockwise rotation of handwheel results in clockwise rotation of output
drive (for view on motor name plate).
NOTICE
Damage to actuator and mounted elements by handwheel operation!
à The set tripping torques do not limit the forces applied by the handwheel.
à Operation via handwheel only.
à Power drive for handwheel operation is only available on request with the manu-
facturer.
à Use of levers of any type is not permitted.
4.2
Dismantling and mounting of the stem nut (output drive type A)
For output drive type A, make sure that the unbored stem nut (delivered unbored if not
stated otherwise) must be provided with a thread bore in compliance with available
stem prior to mounting the DREHMO actuator onto the valve.
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