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Block Valves: Instruction Manual for All Sizes
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1.3.5.3 Disassembly and Cleaning
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 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. Using a 5/8 wrench, turn the solenoid valve fitting (15; 17) counterclockwise and
remove the complete solenoid valve assembly as one unit.
2. Place the solenoid valve assembly (15; 17) aside.
3. Unscrew the four cap screws (2) and remove the air cylinder cover (1).
4. Pull the air cylinder (6) away from the valve body (14; 16). All components except for
the O-ring (13; 15) remain with the air cylinder.
This group of components is collectively referred to as the trim assembly. If only the
main seal is to be replaced, do so at this time, then reassemble the valve. For more
information, refer to “Reassembly” on page 1-16.
5. To disassemble the trim assembly, pull the red visual indicator cap (3) off the valve
stem (8).
6. Using a 7/16" deep socket wrench, turn the stop nut (4) counterclockwise while
gripping the bellows seal disc (11) in the other hand.
7. Remove the stop nut (4) and pull the air cylinder (6) away from the valve stem (8).
8. Proceed to:
❑
Step 9 if disassembly of the air cylinder is necessary (e.g. an air leak is suspected).
❑
Step 12 on page 1-15, if disassembly of the air cylinder is not required.
9. Place the air cylinder upside down on a flat surface with the large bore and piston
cup insert (5) facing down.
10. Remove the piston cup insert from the air cylinder (6) by inserting the eraser end of a
pencil (or similar non-destructive object) into the center bore of the air cylinder and
pushing the piston cup out the other side.
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