Leslie Controls D Series - Manual (Page 5)

CFTIIP-015
Rev.0
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reproduced in one form or another.
Page 5 of 15
5 Valve Maintenance
At least once every six months, check for
proper operation by following the
preventative maintenance steps outlined
below. These steps can be performed while
the valve is in-line and, in some cases
without interrupting service. If an internal
problem is suspected, refer to the “Valve
Disassembly and Reassembly” section.
1. Look for signs of gasket leakage through
the end flanges and bonnet. Re-torque flange
and bonnet bolting (if required).
2. Check for fluid leakage to the atmosphere
through the body drain plug, if applicable.
3. Examine the valve for damage caused by
corrosive fumes or process drippings.
4. Clean valve and repaint areas of severe
oxidation.
5. Check packing box bolting for proper
tightness.
6. If the valve is supplied with a lubricator
fitting, check lubricant supply and add
lubricant if necessary.
7. If possible, stroke the valve and check for
smooth, full-stroke operation. Unsteady stem
movement could indicate an internal valve
problem.
NOTE: Due to excessive friction, graphite
packing can cause the plug stem to move in a
jerky fashion.
WARNING: Keep hands, hair and
clothing away from all moving parts when
operating the valve. Failure to do so can
cause serious injury.
8. Ensure all accessories, brackets and
bolting is securely fastened.
9. If possible, remove air supply and observe
actuator for correct fail-safe action.
10. Clean any dirt and other foreign material
from the plug stem.
11. If an air filter is supplied, check and
replace cartridge if necessary.