HIGH PERFORMANCE BUTTERFLY VALVES - MODEL SLHBF & SLHBFFS
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
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seating surfaces during valve operation.
• Verify that the space available for installation is adequate to allow the valve to be installed and to be
operated.
Note
Ensure sufficient clearance for the stem in the full open position. Inadequate
clearance for valves may add mechanical loading to the valve ends.
6 . 0 M A I N T E N A N C E
No maintenance is required unless the valve leaks. However, routine inspection is recommended for safety
and a longer lifetime. Maintenance should only be performed by an experienced valve maintenance
specialist & with knowledge of high performance butterfly valves. Normal maintenance for a Superseal
HPBV is limited to adjustment of the shaft packing by tightening down evenly on the gland flange using
the gland flange studs and nuts. Over tightening of the gland should be avoided since this will shorten
the life of the packing. During commissioning, it is common for dirt and foreign objects to be left in the
pipeline during construction. This debris can damage the HPBV seat or disc edge which will prevent the
valve from providing tight shut-off. In such cases seat replacement may be necessary.
- Inspect the body, disc and packing after the valve has been in service for a long period of time.
- Check the valve if any abnormal sounds or resistance is noticed during operation.
- Regularly ensure the tightness of each body bolt.
It is recommended that the valve be periodically at least partially stroked to ensure the valve functions
and will prevent seizure/galvanisation of any mating surfaces in stem chamber or seat area (or in the
case of resilient seats) memory moulding of the seat. Duration depends on service, criticality, etc.
However, it also must be factored in that if there are impurities or particulates in the line each operation
could reduce seat life proportionately.
Information in this IOM is only a general guide to serve as an example. The design is different depending
on size, class, seat option, trim type, body style, service & client specification. Refer the as-built drawing
for actual parts.
6.1 PACKING
Leakage from the packing area of the valve can be prevented by tightening of the gland flange’s nuts and
bolts. If the leakage doesn’t stop, packing replacement may be required instead. In this case, see 6.5 for
the method of packing replacement.
