Australian Pipeline Valve - Installation, Operation and Maintenance Manual
8
BALL VALVES - FS900 SERIES
Do not attempt to replacing packing or replace stem while the valve is in service!
(The stem is blowout proof and can only be removed by disassembling the valve).
Only graphite packing is to be used for firesafe service, PTFE is not firesafe. A FS900
valve is firesafe only when fitted with graphite packing and graphite gasket. Check
the full part number on the label to ensure the valve is specified as firesafe. If the
port number indicates PTFE packing or body gasket the valve is not firesafe.
4.1 GLAND PACKING REPLACEMENT
In case of slight leakage from the gland, gland packing bolts can be lightly tightened up without
effecting torque. (Refer to Section 5.0 for Bill of materials).
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 and removed from the line 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 locking tab. Remove
the gland nut.
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, and gland nuts. Tighten gland nut alternately in 1/2 turn increments until a reasonable
torque (Refer to Section 5.0 for Bill of materials) 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 nut in alternating
1/2 turn increments until leakage stops. Once leakage stops, continue tightening gland plate nuts and
additional 1/2 turn. There is also a thrust washer however, this part can only be replaced during
complete disassembly of the valve. Should replacement of packing fail to prevent the leakage,
complete reconditioning of the valve may be required.
