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USER MANUAL
9.5
Planned maintenance tasks
Table 9-2: Planned maintenance tasks
Task
Recommended action
Inspect
Implement a periodic inspection program to ensure all parts
are free from damage during its use due to process, ambient
or other abnormal conditions.
•
Internal components: cylinder, piston, spring, cylinder
head, seat retainer
•
Control valve body
•
Bolting
Clean
Use a non-toxic metal cleaning solvent.
Do not use common petrochemical solvents like Benzene,
Toluene or Xylene as they can pose potential health hazards.
Monitor corrosion / erosion / wear
A careful review of the control valve proving history, such as
control valve factor control charts, can reveal potential
problems bearing drag due to wear or increased internal
cross-sectional area due to erosion.
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 -65° F
to 400° F (-54° C to 204° C).
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.
Planned maintenance
User manual
November 2020
P/N 3-9008-553
62
Daniel Series 700 Control Valve