Australian Pipeline Valve - Installation, Operation and Maintenance Manual
12
FLOATING BALL VALVES - BV100 SERIES
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(s) 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
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 PTFE seal ring/bearing and larger sizes/higher classes
also have an elastomer o-ring. However, these parts can only be replaced during complete disassembly
of the valve. If a PTFE stem o-ring is fitted it can be replaced with an elastomer o-ring suitable for the
service medium and temperature. PTFE stem o-rings may require pre softening in hot water prior to
fitting. 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.
NO. DESCRIPTION
8
11
1
10
2
3
4
5
9
6 7
12
1
Thrust Seal Washer
2
Stem Packing
3
Gland
4
Belleville Spring Washers
5
Stem
6
Gland Nut
7
Spring Washer
8
Handle Nut
9
Packing Nut Lock Clip
10
Stem O-ring
11
Anti-Static Device
12
Lock Device
FIG 2. CONSTRUCTION FOR GLAND PARTS
(example only, refer to as-built drawing)
4.2 BODY SEAL
Sealing between three body segments is provided by a gasket (Teflon, spiral wound or graphite) and both
valve segment surfaces also provide metal to metal sealing. In larger sizes or higher pressures an
elastomer O-ring may also be used. In case of slight leakage the body fastening bolts can be lightly
tightened up.
