ABB PGC5000 Series Service Instructions Manual page 65

PGC5000
PGC5000 Series Service Instructions
Lightly lubricate the tensioning nut O-Ring and the Tensioning Nut threads, internal threads and bore of the body with
3.
High Vacuum Grease.
4. Install the O-ring onto the Tensioning Nut.
5. Screw the tensioning nut into the body until the bottom of the nut grooves is approximately flush with the ears on the
back of the body.
6. Lightly lubricate the piston rod O-ring and the threads of the piston rod.
7. Install the piston rod O-ring onto the piston rod. Do not allow grease to enter the small hole through the center of the
piston.
8. Insert the stem into the rear of the piston rod.
9. Screw the piston rod into the piston and tighten to 27 to 30 in-lb. Do not overtighten or bend the rod or stem! Do not
allow grease to contact the stem.
10. Lightly lubricate the body O-rings.
11. Install the body O-rings onto the body and the piston.
12. Insert the piston and the piston rod into the sleeve, being careful not to cut the O-ring. Fully insert the piston until it
contacts the stops.
13. Stack the 15 Belleville springs onto the 1/4-inch thin wall plastic tubing, as shown in Figure 7.10.
Fig. 7.10. Stacking the Belleville Springs
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.
SI/PGC5000-EN, Rev B
7 Subassembly repair
65