Stacking The Belleville Springs - ABB PGC2000 Operation And Service Manual

13. Stack the 15 Belleville springs onto the 1/4-inch thin wall plastic tubing, as shown in Figure 8-7.
14. Using the tubing only as a guide, slide the Belleville springs over the stem into the bore of the
body.
15. Install the rear valve seat over the stem and let it rest against the Belleville springs. Do not
allow the seat to scratch the stem.
16. Clean all the exposed area of the stem with acetone to ensure the stem and groove are free of
grease and contamination.
17. Slide the first cleaned seal over the stem using the "A" end of Seal Insertion Tool TL-791A006B.
The 30° angle (pointed end) of the seal must face the Belleville springs.
18. Slide the cleaned sample chamber over the stem onto the seal.
19. Slide the second cleaned seal over the stem using the "B" end of Seal Insertion Tool TL-
791A006B. The 30° angled (pointed end) of the seal faces out, away from the sample chamber.
20. Install the vaporizer chamber into the flange.
21. Lightly lubricate the threads on the body.
22. Retract the stem until it is flush with the front of the seal.
23. Screw the body into the flange against the vaporizer chamber until tight.
24. Push the stem into place.
25. The sample chamber should be loose in the assembly at this point. If not, back out the sleeve
until the sample chamber is loose. Use the end of a 0.156 Allen wrench in the slot of the sleeve
to adjust to the point of eliminating the longitudinal play of the sample chamber.
26. Tighten the sleeve in 24 1/4-turn increments (6 turns total) to preload the seals.
27. Lightly lubricate the inside bore of the cylinder.
28. Align the fittings on the cylinder with the sample chamber tubes, or with air lines if servicing.
29. Slide the cylinder onto the piston and the body.
2000-OSM, F1
Figure 8-7. STACKING THE BELLEVILLE SPRINGS
8-11