KROHNE VFM 3100 EN - Manual (Page 44)

6.2. Replacing or Installing an Isolation Valve
The VFM 3100 does not need to be removed from the pipeline to
replace the isolation valve. However, the pipeline must be shut down
and emptied before loosening the mounting bolts.
• If the VFM 3100 is wired with rigid conduit, it may be necessary
to disconnect the input wiring and conduit connections.
• Remove the bolts holding the connector and the valve body.
• Remove and discard old gasket and flow dam. Install a new
gasket and flow dam on the lower section of the valve body and
assemble the valve into the VFM 3100 body. Refer to Figure 38
or Figure 39. These are the same gaskets and flow dams used
with sensors. For standard range valves, use gasket L0121DT
and flow dam L0112KT. For extended range valves, use gasket
K0146HL and flow dam K0146HK.
• Install the four bolts on the bottom flange and tighten, using the
procedure starting on page 38.
• Install a new gasket and flow dam on the sensor. Hold the
sensor, mechanical connector, and housing together and
carefully slide the sensor into the top of the valve body.
• Install the four bolts on the top flange and tighten, using the
procedure starting on page 38.
NOTE: The gasket must be uniformly sealed and the bolts properly
tightened on both the mechanical connector and valve body to assu-
re a leak-tight seal. Failure to follow these steps could result in perso-
nal injury due to gasket leakage.
• Reconnect the conduit and external wiring. Refer to instruction
starting on page 13.
• Replace the covers and resume operation.
44
Mechanical
connector
O-Ring
Sensor
Gasket
Flow dam
Isolation valve
Wrench flat
Open
Close
Gasket
Flow dam
Figure 38. Isolation Valve