FLOW-TEK SERIES 19 SEGMENTED BALL VALVE
Installation, Operation, and Maintenance Manual
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10.0 PREVENTATIVE MAINTENANCE
10.1
At least once every six months, check for proper operation by
following the preventative maintenance steps outlined below.
These steps may be performed while the valve is in line and
without interrupting service. If an internal problem is suspected,
refer to
Troubleshooting
section in this document.
10.2
Look for signs of gasket leakage through the end flanges and
post. If necessary, re-torque end flanges and post cover.
10.3
Examine the valve for damage caused by corrosive fumes or
process drippings.
10.4
Clean the valve and repaint areas of severe oxidation.
10.5
Check packing gland retainer bolting for proper tightness. If there
is a persistent leak that cannot be stopped by tightening of the
gland nuts, replace the packing. (Refer to
Disassembly/Assembly
section in this document.)
CAUTION
Do not over tighten packing. This can cause excessive packing
wear and high stem friction that may impede stem movement.
Reference
Tables in Appendix A
for recommended and maximum
torque values. Do not exceed maximum torque values.
10.6
If possible, stroke the valve — checking for smooth, full stroke
operation. Unsteady stem movement may indicate an internal
valve problem.
10.7
Check the calibration of the positioner/controller if available.
For further preventative maintenance, see the instructions in
the Installation, Operation, and Maintenance manual for the
applicable positioner/controller.
10.8
Ensure all accessories, brackets and bolting are securely fastened.
10.9
If possible, remove power source (air supply/electrical signal) and
observe actuator for correct fail-safe action.
10.10
Check the actuator and all air connections for leaks.
10.11
If an air filter is supplied, check and replace the cartridge if
necessary.