12
5.3 OVR Cartridge Replacement
1
2
3
4
1
Outlet flange
3
Inlet Manifold
2
M12 Manifold fixings
4
OVR Cartridge
1
Close the isolation valves.
2
Slowly open the drain valve on the pre-filter to
depressurise the OVR and filters.
Move away from the OVR during depressurisation.
3
Whilst supporting the outlet piping, carefully
remove the outlet flange from the inlet
manifold.
4
Unscrew the M12 manifold fixings and unscrew
the fixings.
5
Carefully lift the inlet manifold of the OVR and
store it safely.
6
Lift the cartridges out of the columns and discard.
7
Inspect the columns and ensure that they are clean, dry and not
damaged.
8
Fit the replacement cartridges into the columns.
9
Refit the manifold and secure the M12 fixings in sequence,
starting with the bolts in the centre of the manifold and working
outwards. The fixings should be secured in two stages Stage 1:
27Nm (20 ft.lb) and Stage 2: 40Nm (30 ft.lb).
10
Reattach the outlet flange ensuring that the flange o-ring is
located correctly. If required use a light coating of Molykote III
grease on the o-ring to hold it in position. Secure the flange nuts
to 40Nm (30 ft.lbs).
The inlet manifold is heavy and depending upon the
model of OVR may require lifting equipment.
