PIETRO FIORENTINI HBC 975, Manual

Page: 99 / 156

99
HBC 975
Use, maintenance and warning manual
SLAM-SHUT VALVE | MAINTENANCE AND FUNCTIONAL CHECKS | REV. 00
EN
Step Action
49
Remove the O-ring (42) from the stem (6) and replace it, taking care to lubricate it with synthetic grease.
NOTE!
Before inserting the replacement O-ring, clean the retaining slots with a cleaning solution.
50
APPLICABLE FOR DN 6”- 12” ONLY
Undo and remove the screws (86).
51
APPLICABLE FOR DN 6”- 12” ONLY
Take out the plug guide (72).
NOTE!
In this step, tighten some M6x50 screws into the threaded holes of the plug guide; screw them in
for vertical removal so that the plug guide remains always aligned.
52 Remove the screws M6x50.
53
APPLICABLE FOR DN 6”- 12” ONLY
Remove the O-ring (87) from the plug guide (72) and replace it, taking care to lubricate it with synthetic grease.
NOTE!
Before inserting the replacement O-ring, clean the retaining slots with a cleaning solution.
54
APPLICABLE FOR DN 6”- 12” ONLY
Put the plug guide (72) in place.
55
APPLICABLE FOR DN 6”- 12” ONLY
Insert and fix the screws (86) according to the following tightening torques:
• DN 6” > tab. 9.51;
• DN 8” > tab. 9.52;
• DN 10” > tab. 9.53;
• DN 12” > tab. 9.54.
NOTE!
Tighten the screws according to the cross diagram in paragraph 9.4.2.2.
56
Insert the stem (6) together with the key (28) in the stem guide (20).
NOTE!
Lubricate the rod surface with silicone grease; make sure that the key (28) is in the correct posi -
tion in the stem (6).
57 Insert the stem guide (20) together with the stem (6) into the plug guide (70).
58
Fit the flange (73).
NOTE!
Match the chamber pressurisation hole with the plug guide hole (70)