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Block Valves: Instruction Manual for All Sizes
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15. Turn the bottom nut counterclockwise using the wrench. The nuts should not rotate with
respect to the stem, instead the stem rotates with respect to the seal disc. Continue
turning the stem until it separates from the seal disc.
16. Remove the nuts from the stem (8).
17. Separate the remaining component: bellows and seal disc (11) by hand.
18. Using plastic tweezers or other non-destructive instrument, remove O-ring (12; 14) from
the seal disc and the O-ring (13; 15) from the valve body.
19. Proceed to:
❑
Step 20, if an air leak is suspected in the solenoid.
❑
Otherwise, disassembly is complete.
CAUTION
When cleaning the parts of the bellows/stem assembly, wipe
only the surface area of the bellows and seal disk exposed to
the vacuum system. Soaking the bellows/stem assembly in an
alcohol bath damages the O-ring (8) and causes it to outgas
under vacuum.
20. Clean the metal components using an alcohol-dampened cloth or a light abrasive cloth
such as Scotch-Brite™.
21. Wipe all surfaces with an alcohol-dampened cloth and allow components to dry
thoroughly.
1.3.5.4 Reassembly
Refer to Figure 1-5 on page 1-11 for this procedure.
NOTE
In this procedure, the components (shown in Figure 1-5,
identified in Table 1-5 and Table 1-6) are enclosed in
parentheses, using the following convention:
❑
A single number or a series of numbers not separated by a
semi-colon refer to both the small and large valve.
❑
In a set of numbers separated by a semi-colon:
❑
The first item number identifies an item in the
small block valve.
❑
The second item number identifies an item in the
large block valve.
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