Planned Maintenance Tasks - DANIEL 762 User Manual

CONTROL VALVES 762, 763, 765, 766 AND 767
Planned maintenance
8.
9.
10.
11.
12.
9.5

Planned maintenance tasks

Table 9-4:
Task
Inspect
Clean
Monitor corrosion / erosion / wear
Part (seal) replacement
Corrosion monitoring
Lubricant information
Proper lubrication procedure
94
94
www.Daniel.com
Reinstall and tighten nuts.
Remove (2) long rods. Reinstall studs.
Re-establish nitrogen line connections to the valve.
Open all product flow to the valve.
Return the valve to service.
Planned maintenance tasks
Recommended action
Implement a periodic inspection program to ensure all parts
are free from damage during its use due to process, ambient
or other abnormal conditions.
•
•
•
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.
A careful review of the control valve proving history, such as
control valve factor control charts, can reveal potential prob-
lems bearing drag due to wear or increased internal cross-
sectional area due to erosion.
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 re-
placement. Do not twist or overstretch the O-ring during as-
sembly.
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 de-
signed 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.
High-viscosity silicone oil with a temperature range of -54° C
to 204° C (-65° F to 400° F).
Lubricate the entire surface of the O-ring before installation
with a thin layer of high-viscosity silicone oil. Remove excess
lubricant.
Internal components: cylinder, piston, spring, cylinder
head, seat retainer
Control valve body
Bolting
Daniel Models 762, 763, 765, 766 and 767 Control Valves