Australian Pipeline Valve - Installation, Operation and Maintenance Manual
9
FLOATING BALL VALVES - SLFSBV02 & SLBV02 SERIES
The most common area for leakage is around the stem packing, this is usually due to wear and can
normally be stopped by adjusting the packing. This procedure is performed by turning gland bolts or nut
(8) 1/2 turn at a time until leakage stops. Once leakage stops, continue tightening gland plate nuts an
additional 1/2 turn. If leakage cannot be halted by adjusting packing, repacking of the valve is indicated.
(Refer to field repair).
4.1 GLAND PACKING
In case of slight leakage from the gland, gland packing bolts can be lightly tightened up without
effecting torque. (see 4.0). See Figure 3 and table 1 in the Appendix.
Do not attempt to repack or replace stem while the valve is in service! Only
graphite packing is to be used for firesafe service, PTFE is not firesafe. SLFSBV02 is
firesafe only when fitted with graphite packing and graphite or spiral wound
graphite filled end gasket. Model SLBV02 is not firesafe. If there is not firesafe logo
on the label the valve is not firesafe. The part number code on the label will
indicate the stem packing and body gasket.
4.1.1 Stem Leakage – Stem Packing Replacement
The most common point for leakage is around the stem and packing this leakage can normally be stopped
by adjustment of the packing gland. If this does not stop the valve leakage, the valve will have to be
repacked.
The system and valve MUST be depressurised before attempting any repair work. After removing all
pressure from the valve and draining the system the following procedure should be used to repack the
valve.
1. Remove nuts or screw from the lever. Remove the lever and lock plate. Remove the gland plate bolts
and remove the gland plate and gland. If the gland retainer is a double nut type then remove both nuts
and anti vibration washer.
2. Remove old packing, taking care not to scratch or damage the stem of stuffing box. Note, the stem
design is anti-blow out so the stem cannot be removed up through the top of the valve.
3. Clean and inspect stem, stuffing box, and gland. If any scratches, nicks, or corrosion is found, the parts
should be replaced.
4. Slide each packing ring over the stem and into packing chamber. Carefully tap each ring into place and
continue installing rings until the recommended number of rings have been installed. A thin smear of
molybdenum sulfide anti-seize grease may be used on the stem and packing chamber wall for packing
lubrication.
5. Replace gland, gland plate, and gland plate bolts. Tighten nuts alternately in 1/2 turn increments until
a reasonable torque (refer table 2 in the Appendix) is applied to lightly compress packing. Lubricate
stem and cycle valve through a couple of complete cycles.
6. If slight stem leakage occurs after system is pressurised, continue tightening gland plate bolts in
