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Maintenance
Revision: 1 – Nov 2019 Doc No: OMMB00301
7. For 5”, 6” and 8” steel BO valve, lightly grease ‘O’ ring (Item 17)
and slide over cap plate (Item 44). Secure housing to cap plate
with screws (Item 28) and Loctite 241. Go to step 11.
8. For BR valves. Lightly grease ‘O’ ring (Item 17) and slide over
override stem and seat into recess in the stem adaptor followed
by the ‘O’ ring retainer (Item 37).
9. Screw manual override housing onto override stem. Refit shims
(Item 24). Ensure indicator plates are facing outward, on 6BR one
row to face nameplate and two rows to face other side. Secure
housing to stem adaptor with screws (Item 28) and Loctite 241.
Fit indicator pin (Item 36) into override stem, ensuring element
assembly still closes.
10. Wind manual operator nut and check sliding valve fully closes
onto seat. Return valve to auto position and secure operating nut
with locknut (Item 38). Ensure washer (Item 32) is free.
11. Position lubricated gasket (where fitted) on upper housing joint
face, or lightly grease and fit replacement ‘O’ Rings in upper
housing joint face element recess(es). Position lower housing over
upper housing, and secure with nuts and washers (Items 12 &
11). For nut torque settings, see Table 4.
Size Code O ring O ring Gasket Gasket
Nm lb ft Nm lb ft
1 ½ 54 40 68 50
2 54 40 68 50
2 ½ 80 60 122 90
3 80 60 122 90
33 80 60 122 90
4 54 40 68 50
5 80 60 122 90
6
80 60 122 90
8 80 60 122 90
Table 4 - Tightening torques for housing nuts
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