2 PIECE BODY BALL VALVES - FS660 SERIES
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
11
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 the gland nuts.
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 and tighten gland nut(s) alternately in 1/4 turn increments until a reasonable torque 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
1/4 turn increments until leakage stops. Once leakage stops, continue tightening gland plate nuts and
additional 1/4 turn. There is also a PTFE seal ring/bearing and some models also have an elastomer
o-ring. However, these parts can only be replaced during complete disassembly of the valve. If a stem
o-ring is fitted it can be replaced with an elastomer o-ring suitable for the service medium and
temperature. Should replacement of packing fail to prevent the leakage, complete reconditioning of
the valve may be required.
Personal injury may result from sudden release of any process pressure. APV
recommends the use of protective clothing, gloves and eye wear when performing
any installation or maintenance. Isolate the valve from the system and relieve
pressure prior to performing maintenance. Disconnect any operating lines providing
air pressure, control signals or electrical power to actuators.
