Keeping the World Flowing
15
12.0 Operation
12.5 Mechanical Manual Override
Single-Acting Actuator
The mechanical manual override can be of two types:
• Type MH: With a jackscrew with protection pipe
• Type MHD: With a jackscrew with protection pipe and a
declutch able handwheel
Type MH mechanical manual override
Fig 12.5 Type MH mechanical override up to actuator
cylinder size 200
Type MH mechanical manual override
Fig 12.6 Type MH mechanical override up to actuator
cylinder size 385
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
Instructions to engage or disengage the override are reported
on the plate installed on manual override:
Fig 12.7 Type MH manual override plate
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...
