April 2022
Installation, Operation and Maintenance Manual
E-90090007 Rev. 0
23
Section 7: Maintenance
Maintenance
NOTE:
For FS operator, the spring cartridge located below the piston can only be removed after
piston and drive rod is removed from the operator.
10.
Go to the next step (that is step 11) if the piston center seal (52) will not be
replaced. There is no need to separate the piston from the drive rod.
Remove drive rod hex nut/jacknut (90), piston (11), piston seal (72), piston wear
ring (42), and piston center seal (52). When removing the hex nut, fix the drive rod
by clamping the flat surface at its bottom securely with some mechanical means
(for example, bench vise), to prevent the drive rod from turning with the nut.
To remove a jacknut, remove all jackscrews first then unthread the jacknut.
11.
Remove lower cylinder seal (55), drive rod guide (40), drive rod seal (70), and
wiper (44) from the cylinder plate of pedestal assembly (140).
NOTE:
Operator seal can be replaced with the pedestal assembly (140) remained on the valve.
7.3
Inspection and Cleaning
•
All parts indicated are noted in Figure 7 and Figure 8. Before starting the
reassembly process, perform the following:
•
Thoroughly clean all parts except gaskets (if supplied) with Varsol or equivalent.
•
Inspect all parts, checking in particular any parts/features on parts that seal or rub
against another part.
—
Check internal surface of the cylinder (17) for scoring, scratches,
or other wear.
—
Check all metal parts for wear, corrosion, and physical damage.
•
Ensure cleaned parts are covered if stored outside.
