16
Installation, Commissioning and Maintenance Manual
12.0 Operation
Type MHD mechanical manual override
Fig 12.8 Type MHD mechanical override up to actuator
cylinder size 200
Fig 12.9 Type MHD mechanical override up to
cylinder size 385
• ENGAGE PROCEDURE: Pull disengaging knob and
handwheel at the same time; rotate the handwheel until
the manual override gets engaged
• DISENGAGE PROCEDURE: Pull disengaging knob and
push the handwheel, at the same time
When the manual override is disengaged, the handwheel
operation is neutral and the actuator can be operated
pneumatically.
Instructions to engage or disengage the override are reported
on the plate installed on manual override:
Fig 12.10 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.
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Summary of Contents for LP/S Series
Page 89: ...Keeping the World Flowing 89...
