Instruction and Operation Manual
- 11 -
Failure (risk)
Cause Troubleshooting
Leakage of packing
1.
Gland flange nuts loose
2.
Rings of packing not
enough
3.
Packing aged or failure
4.
Stem sealing damaged
1.
Equally tighten eyebolt nuts
2.
Add packing
3.
Replace packing
4.
Stem shall be maintained
periodically by reparation or
replacement conjunction with
the maintenance of pipeline
Leakage between sealing
surfaces
1.
Dirties between sealing
surfaces
2.
Sealing surfaces damaged
1.
Clean sealing surface
2.
Repair the sealing surfaces
Operation failure
1.
Packing too tight
2.
Thread of stem nut over
worn
3.
Stem bent
4.
Foreigner existence between
stem and stem nut or gland
1.
Proper loose gland flange nuts
2.
Replace stem nut
3.
Rectify or replace stem
4.
Clean foreign matter
Leakage between bonnet
flanges
1.
Bonnet bolts loose
2.
Bonnet gasket failure
1.
Proper tighten bonnet nuts
2.
Replace bonnet gasket
Body and bonnet broken
and leaked
1.
Water hammer
2.
Fatigue
3.
Freezing broken
1.
Carefully operation to prevent
suddenly stopping pumping and
rapidly shutting
.
2.
Replace valve that exceeds
guarantee period or is found with
early fatigue defection
3.
Drain away water in winter
12.
Quality Warrant
12.1
SPECS warrants its valves
the date of delivery to the original customer, against defects in material and workmanship under
proper and normal use and service and not caused of resulting from improper
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