Australian Pipeline Valve - Installation, Operation and Maintenance Manual
10
FLOATING BALL VALVES - SLFSBV02 & SLBV02 SERIES
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 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.
FIG 3. CONSTRUCTION FOR GLAND PARTS
(Bolted yoke type packing retainer shown)
4.2 BODY SEAL
Sealing between the end cap insert and body is provided with a gasket (Teflon, spiral wound or graphite)
and both valve segment surfaces also provide threaded metal to metal sealing.
If a gasket seal is disturbed while removing or adjusting gasketed parts, APV
recommends installing a new gasket while reassembling. A proper seal is required
to ensure optimum operation.
4.3 INSPECTION AND REPLACEMENT OF TRIM COMPONENTS
Disassembly: -
1. Place the valve in the half open position and remove all pressure and drain the system. Make sure that
leakage of any residual material is caught in an appropriate container and disposed of properly.
2. For gear operator or power actuator operated: - remove the bolt fastening the gearbox or power
actuator. Remove the gear operator or power actuator. Remove the bolt fastening the yoke or yoke nut
(depending on size/class).
