Emerson Daniel 788DVC, User Manual

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Table 9-3: Planned maintenance tasks
(continued)
Task Recommended action
Part (seal) replacement Visual inspection of the O-rings is recommended once a year
and replacement of the O-rings is recommended at least
once every five years. Follow internal procedures for part
replacement. Do not twist or overstretch the O-ring during
assembly.
Corrosion monitoring Daniel recommends visually inspecting the control valve for
corrosion in the internal components at least once a year.
Follow internal procedures for corrosion. The valve was
designed without corrosion allowance. Periodically inspect
the valve's metal parts for corrosion and erosion, and inspect
the seals and O-rings for wear and chemical damage.
Lubricant information High-viscosity silicone oil with a temperature range of -54° C
to 204° C (-65° F to 400° F).
Proper lubrication procedure Lubricate the entire surface of the O-ring before installation
with a thin layer of high-viscosity silicone oil. Remove excess
lubricant.
User manual Planned maintenance
P/N 3-9008-556 October 2019
User manual 81