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Recommended Spare Parts Holding by product<br />
Class I – Start-up/Consumable<br />
Class II – 1–5 Years<br />
Operational Spares<br />
Class III – 5–10 Years<br />
Major Overhaul<br />
Parallel Check Valves Bled Steam Feed Heater Reheater<br />
Slide Valves Check Valves Isolation Isolation<br />
Device Devices<br />
Class I Bonnet Gasket ● ● ●<br />
Closure Seal ●<br />
Gasket ●<br />
Gland Packing ● ●<br />
Hinge Pin Gasket ● ●<br />
‘O’ Rings ●<br />
Pressure Seal ● ● ● ● ●<br />
Class II Discs ●<br />
Disc Assembly ●<br />
Disc Clips ●<br />
Disc/Disc Assembly ●<br />
Disc Springs ●<br />
Gland ● ● ●<br />
Gland Ring ●<br />
Hinge Pin ● ●<br />
Hinge Pin Bush ● ●<br />
Hinge Pin Housing ● ●<br />
Neck Bush ● ● ●<br />
Stems ●<br />
Stem/Belteye Assy. ●<br />
Stem Stop ● ●<br />
Valve Head ●<br />
Valve Head Nut ●<br />
Class III Bonnet ● ● ● ●<br />
Bonnet Collar ●<br />
Collar ●<br />
Cover ● ● ● ● ●<br />
Distance Piece ● ● ● ● ●<br />
Gland Flange ● ● ●<br />
Pillars ● ● ●<br />
Screwed Plug ●<br />
Segment Ring ● ● ● ●<br />
Split Ring ● ●<br />
Thrust Plate ●<br />
Yoke Bush ●<br />
101
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