9-3
9-1-2. Disassembly and assembly
(1) Detach the actuator from the valve as described in Section 4.1.
(2) Loosen the packing flange nut.
(3) Loosen the hex nut (1) of the bonnet, using the wrench.
(4) Raise the bonnet and remove the gasket (2).
Note: When raising the bonnet, press down the stem so that it will not come up together
with the bonnet.
(5) Remove the hex nut (2) which fixes the extension, using the wrench. Detach the extension
together with the stem from the valve body.
Note: The stem section has the valve plug, bellows flange, bellows assembly and pin,
assembled together.
(6) The procedure of this step differs depending on Cv value and presence/absence of the
PTFE insert as described in Steps (6)-1 and (6)-2.
(6)-1. For Valves with Cv. 4 (See Figure 9-1.)
• Remove the stem from the extension.
• Holding the valve plug using a vise or other tool, remove the pin by using a chisel.
Detach the stem from the valve plug by turning the stem counterclockwise.
Note: To turn the stem, put back the stem connector onto the stem.
(6)-2. For Valves with Cv ≥ 6.3 and with PTFE Insert (See Figure 9-2.)
• Hold the valve plug with a vise or other tool, pull out the valve plug until the
pin comes out of the extension, remove the pin by using a chisel or other tool,
and then detach the stem (together with the extension) by turning the stem
counterclockwise.
Note: To turn the stem, put back the stem connector onto the stem.
(7) Remove the gasket and seat ring. (See "4-2. Disassembly and assembly of valve body")
For assembly of the control valve, follow the disassembly procedure in the reverse order.
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