Elkhart Brass 70133000 Electric Valves - Manual (Page 37)

37
V MAINTENANCE
Routine maintenance or lubrication is not required
VI TROUBLESHOOTING
TROUBLESHOOTING
Symptom Probable Cause Solution
Valve opens only a few
degrees and stops (it will
not open to the full angle
desired). Improper installation. The
valve is improperly aligned.
• Loosen the flange bolts, realign the valve
with flanges, and retighten the flange bolts
to correct torque per ANSI requirements.
Leakage past the flange
face. Flange bolts are not evenly
torqued.
• Loosen the flange bolts and tighten the
flange bolts to correct torque per ANSI
requirements.
Improper flanges
• Refer to “Flange requirements” on page 1.
Leakage in the closed
position (leakage in the
pipeline). The disc is not closing fully:
Actuator is not properly
adjusted or seating torque
exceeds actuator output
capacity.
• Refer to actuator adjustment procedures or
consult the factory (or local rep.).
Damaged seat.
• Replace seat.
Line pressure exceeds valve’s
working pressure.
• Reduce line pressure to valve working
pressure.
Damaged valve disc. • Replace disc.
Leakage at the valve
stem. Packing/bushing failure.
• Refer to “Valve Disassembly” procedures.
Leakage at body split
connection. Stem hole in seat (secondary
seal) damaged during
assembly. • Replace seat.
Water hammer. The valve is closing too
quickly.
• Adjust the actuator.
Excessively high torque. Obstruction in the pipeline.
• Remove valve from pipeline and remove
obstruction.
Valve stem or disc bent.
• Return valve to factory for disc/stem
replacement (check for water hammer or
freezing of line material).
Scale buildup on disc or seat.
• Open and close the valve several times.
Operate the valve at least once a month.
Check the valve seat for deterioration.
Seat damage.
• Check seat for damage and replace if
necessary.
Valve improperly installed.
• Disassemble valve and re-assembly per
instructions.