DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
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Problem
Possible Causes
Remedy
Gland nuts are loose
Tighten gland nuts
Leakage through
the stem packing
Gland is binding against
the stem
Check to ensure that the gland is centered
and evenly tightend
Inadequate amount of
packing rings
Install additonal packing rings
Packing is hard and dry
Replace with new packing
Leakage through
the stem packing
Packing was not properly
cut and staggered
Replace with new packing
Stem is damaged
Repair or replace as required
Stem is binding
during travel
Remove dirt and lubricate stem with grease
Hand wheel is
difficult to turn
Stem packing is exerting
excessibe force on stem
Check torque on gland nuts
Stem is damaged
Examine stem through full open and close action.
Repair or replace as required.
Internal components
may be damaged
Disassemble the valve.
Inspect and repair as needed.
TROUBLESHOOTING