December 2019
136
Installation, Operation and Maintenance Manual
VCIOM-08500-EN
Appendix
Appendix
B.8.2 Disassembly and Re-assembly
CAUTION
Using a fastener other than the approved type may result in damage to the actuator or
valve. Refer to Table 7.
CAUTION
Failure to use proper torque values can result in damage to the actuator and/or valve.
If disassembly and subsequent re-assembly of the explosion-proof enclosure is required,
take the necessary care to maintain all parts in their original condition.
To achieve this, the following steps must be taken:
• Do not damage the explosion-proof mating surfaces on the housing or on the
electrical enclosure cover.
• Reinstall all the screws that came with the dismantled parts and coat them with a
lm of molybdenum-based grease. This will prevent the screws from sticking and
make future maintenance operations easier.
• If the screws need to be changed, the new screws must be of equal dimensions
and at least equal material quality to the screws originally supplied with the unit.
• Replace the weather-proof seals that may have been removed, i.e. O-Rings for
the cover.
• In particular, be sure to spread a lm of Aeroshell grease over the joint surfaces of
all enclosures.
B.8.3 Repairs
When needed, repairs must only be carried out using spare parts supplied by the
manufacturer. All accessories must comply with approved specications and follow the
application and site requirements.
WARNING
Installation, conguration, commissioning, maintenance, and repairs must be performed
by approved and qualied personnel only.
WARNING
The values of gaps of explosion-proof joints are lower than the maximum specied on
Tables of IEC/EN 60079-1 Standard and the values of widths of the explosion-proof joints
are greater than the values specied in the tables of the Standard IEC/EN 60079-1. Should
maintenance require the replacement of any component that forms part of an explosion-
proof joint, only an original spare provided by Emerson can be used. Direct repair or
reconstruction of the above components is not permitted without Emerson authorization.
Not performing this procedure will invalidate the product safety and contractual guarantee.
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