Installation, Commissioning and Maintenance Manual
16
Instructions to engage or disengage the override are reported
on the plate installed on manual override:
Fig 12.9 Instructions plate for MHD manual override
Fail to close, single-acting actuator:
•
Rotate the handwheel counter-clockwise to open
the valve
Fail to open, single-acting actuator:
•
Rotate the handwheel clockwise to close the valve
Before re-starting the actuator with air supply,
rotate the jackscrew again to set the actuator in its
original position.
12.5 Mechanical Manual Override
Double-Acting Actuator
The mechanical manual override is type MD: manual
handwheel declutch able.
Type MD mechanical manual override
Fig 12.10 Type MD Mechanical Override
•
ENGAGE: rotate lever (7) by 180°
•
DISENGAGE: rotate back lever (7) by 180°
When the manual override is disengaged, the handwheel
operation is neutral and the actuator can be operated
pneumatically.
Instructions are reported on the plate installed on
manual override:
7
Fig 12.11 Instructions plate for MD manual override
•
Rotate the handwheel counter-clockwise to open
the valve
•
Rotate the handwheel clockwise to close the valve
12.6 Hydraulic Manual Override for
Single- and Double-Acting Actuators
For the hydraulic manual override installation and operation
procedures refer to PUB016-004-00.
After each use, verify that the manual override has
been disengaged.
12.0 Operation
A4US
US
A4
US A4
US
A4
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