Azbil ACN Series, User Manual

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4-2
4-2-1. Disassembly and assembly of plain (-17 ≤ t < 230 °C) and extension 1 (-45 ≤ t <
17 °C) bonnet type valve body
4-2-1-1. Disassembly procedure
Step Procedure
1 Loosen the packing flange nut of the packing flange.
2 Remove the hex nuts (1) of the bonnet (extension bonnet).
3 Lift bonnet and remove. If the valve plug and cage (upper) are extracted
together, turn the plug and cage (upper) to remove them from the bonnet,
exercising care not to damage the stem. Then turn cage (upper) to extract plug
from the cage (upper) exercising care not to damage seat ring. Seat ring and
scraper ring may be damaged if the plug is extracted from the bottom of cage
(upper).
4 Pull out the plug and then pull out the cage from the valve body.
4-2-1-2. Inspection
Inspect the disassembled parts for damage. If any damages is found, replace the parts. (When
ordering parts, mention also the Prod. No. of the valve which is indicated on the nameplate.)
(1) Do not re-use the removed gland packing. Use fresh packing when reassembling the valve.
(2) Check and ensure that there is no scar on sliding portions of plug, cage (upper) cage
(lower), seat face and stem.
(3) Check and ensure that there is no scar on sliding parts of seal ring and scraper ring. For a
guideline on parts replacement, Refer to "Chapter 14. Recommended spare parts".
(4) Check and ensure that there is no scar on body, bonnet and gasket faces. Do not reuse the
gasket once its removed. Always use a new one when reassembling. For a guideline on
parts replacement, Refer to "Chapter 14. Recommended spare parts".