b'FLOATING BALL VALVES - SLFSBV01 & SLBV01 SERIESA good program of inspection and maintenance cannot be overstressed. It is recommended that the valve be periodically and at least partially stroked/function tested to ensure the valve functions and prevent seizure/sticking of any mating surfaces. Duration depends on service, criticality etc. However it also must be factored in that if there are impurities or particulates in the line each operation could reduce seat life proportionately. Periodic inspection of critical leak-path areas such as body/bonnet joint, end connections, seating surfaces, and around the stem packing should be a requirement.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 PACKINGIn case of slight leakage from the gland, gland packing bolts or nuts can be lightly tightened up without effecting torque. (see 4.0) See Figure 3 and 3.1 and 4 and table 3 in the Appendix for the bolted style glands.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. SLFSBV01 is firesafe only when fitted with graphite packing and graphite or spiral wound graphite filled body gasket. The part number code on the label will indicate stem packing and body gasket. Model SLBV01 is not firesafe, only SLFSBV01 is firesafe.4.1.1 Stem LeakageStem Packing ReplacementThe 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 or nut 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 10 Australian Pipeline Valve - Installation, Operation and Maintenance Manual'