Block Valves: Instruction Manual for All Sizes
1-8
D
R
A
FT 9/
21
/04
1.3.4.1 Disassembly and Cleaning
Refer to Figure 1-4 on page 1-6 for this procedure.
NOTE
In this procedure, the components (shown in Figure 1-4,
identified in Table 1-3 and Table 1-4) are enclosed in
parentheses using the following convention:
❑
A single number refers 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.
To disassemble and clean the valve:
1. Loosen the set screw (2) with a 3/32 Allen wrench and pull the knob (1) off the valve
stem (5; 6).
2. Remove the four Allen head cap screws (3) and pull the top plate (4) and bellows/valve
stem assembly (7, 8, 9, and 10; 5) from the valve body as one unit. If only the main seal
O-ring (8) is to be replaced, do so at this time and then reassemble the valve
(“Reassembly” on page 1-10).
3. Holding the valve stem (5; 6) of the bellows/valve stem assembly ((8, 9, and 10; 5)
between the fingers of one hand, unscrew the top plate (4) with the other hand and
remove the plate from the valve stem (5; 6).
The bellows/valve stem assembly (7, 8, 9, and 10; 5) is treated as a single unit; its
separate components, however, are listed on the parts list.
4. Remove the O-ring (8; 11) from the seal disc and the O-ring (9; 12) from the valve body
(10; 13). Use plastic tweezers or a similar non-destructive instrument to remove the
O-rings so as not to mar O-ring groove surfaces.
13
Valve Body
L6600001
L9970401
L9971401
Valve Body,
Nickel-plated
L6600003
L9970003
L9971003
Table 1-4
Large Block Valves: Manual Valve Parts List (Continued)
Description
Vacuum Technologies Part No. or Equivalent
Item
NW50
ISO63
ISO80
Содержание L6280
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