1. Valve Cap
2. Belleville Washers (6 total)
3. Allen Screws (3 total)
4. Teflon Disc Seal Diaphragm
5. Dacron Cushion Diaphragm
6. Plungers (6 total)
7. Ferrule Top
8. Ferrule Bottom
9. Connector
10. Port Tubing
12. Air Loaded (Upper) Piston
13. Valve Plunger Body
14. Cylinder Base
15. Spring Loaded (Lower) Piston
16. Allen Screws (3 total)
17. Belleville Washers (6 total)
18. Inner (small) O-Ring
19. Outer (large) O-Rings
20. Large Belleville Washers (3 total)
Figure 4-16 Exploded View of Model 20 Valve
4.4.2.7 M20 Procedure - Cleaning of Parts
All parts must be inspected for cleanliness, including catalyst or polymer buildup on the valve
cap. Before re-assembly, faces of the plunger valve body (13) should be wiped clean using
hexane, acetone, or methanol and a lint free cloth.
An ultrasonic cleaner filled with a recommended cleaning solvent or detergent is recommended
for cleaning all components. However, after cleaning, there must not be any remaining residue.
If cleaning solution becomes contaminated during cleaning, it must be replaced with an
uncontaminated supply.
A syringe and appropriate solvent can be used to flush the ports of the valve cap. This is
described in the procedure.
Valves
4.4 Model 20 Valve
Maxum II Valves and Oven Components
62 Service Manual, 10/2018, A5E42019844001
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