Installation, Commissioning and Maintenance Manual
14
12.0 Operation
7 2.1 6 4 1
Fig 12.3 GP/D (cast body) main components
7 2.2 6 4 1
Fig 12.4 GP/D (welded body) main components
Table 2: GP/D Parts list
IT DESCRIPTION QTY
1 Mechanical stop bolt 1
2.1 Centre body (cast iron) 1
2.2 Centre body (welded) 1
4 Cylinder tube 1
6 Mechanical Visual Indicator 1
7 Centre body closure flange 1
12.2 Operating Description
Please refer to the Operating Diagram supplied for the
specific actuator.
In case of use of GP/D actuators in SIL applications the System
Integrator must fulfil all requirements reported in par. 11.2.11
of standard IEC61511-1.
Do not use the actuator outside 90° ±5° operating
range.
12.3 Manual Override
The GP series can be fitted with an emergency manual
override suitable to operate the actuator in the event of fluid
supply failure.
This device can be of mechanical screw type operated by
means of a handwheel, or of hydraulic type, with a hydraulic
cylinder operated using a hydraulic hand pump.
A maximum operating time of the manual
override of 24 hours, for maintenance or testing, is
recommended.
Note: The use of manual override is not recommended
in SIL applications. If it is necessary, strictly follow
instructions reported in the following paragraphs.
Before operating the mechanical manual override, ensure
that the cylinder is not pressurized and that the actuator is in
the fail position, then proceed as indicated in the following
paragraphs.
Important:
It is recommended to regularly clean the “M”
jackscrew and grease it afterwards. Use a Molykote HSC
PLUS grease.
After each use, verify that the manual override has
been disengaged before returning to remote operation
The manual override can be of mechanical type or
hydraulic type.
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