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10.1 Bellows Valve Disassembly
(Figure 19)
Note:
Spiral wound gaskets are standard in the 21000
BS Series design. IT IS RECOMMENDED THAT NEW
GASKETS ARE INSTALLED EACH TIME THE VALVE IS
DISASSEMBLED.
10.1.1 Threaded Trim
After removing the actuator, disassemble the body S/A using the
following procedure:
•
Disconnect the leak-off circuit from the bonnet (if this option
is included). Remove nuts (27) and bonnet studs (26) from
the bonnet (25).
•
Remove packing flange stud nuts (3), packing flange (4)
and packing follower (5). Remove bonnet (25).
•
Remove existing packing (6).
•
Remove body stud nuts (10).
•
Remove bonnet extension (29), stem bellows S/A (30) and
plug (16) at the same time.
•
Remove the plug pin (17), then remove the plug (16) from
the plug stem (30). (See section 10.2.1.1 for unpinning the
plug stem).
Figure 16 - 21000 Series
3/4" to 2" Valve Sizes ANSI Class 900 to 2500
Figure 17 - Angle Body Design
3/4" to 6" Valve Sizes ANSI Class 150 to 600
3/4" to 2" Valve Sizes ANSI Class 900 to 2500
•
Remove stem bellows S/A (30) by the top of the bonnet
extension (29). If necessary, disengage the upper bushing of
assembly (30) using a screwdriver in the groove provided for
this purpose.
CAUTION
CAUTION
WARNING
DANGER
Be careful not to damage the seating surfaces of the
bellows bushing.
•
Remove the bonnet and spacer gaskets (28) and the body
gasket (11).
•
Bonnet extension (29), plug (16), guide bushings and seat
ring (14) may now be inspected for wear and service damage.
After determining the maintenance required, proceed to the
appropriate section of these instructions.
10.1.2 Quick-Change Trim
Removal of the quick-change trim is accomplished using the
same procedures as removal of the threaded trim.
However, after the bonnet extension (29) has been removed
from the body, remove the cage (13), the seat ring (14) and the
seat ring gasket (15).
