8
2 BO 70 en
3.5
Demounting
Make sure that:
□
the pipeline is pressureless, flushed and empty.
□
the valve mentioned is undocked from the process.
□
The valve is in a defined position (normally closed).
For demounting the valve, proceed in the following order:
□
Close the valve.
□
If you detach the actuator to demount the valve, tag the
actuator to the valve body with a waterproof marker.
□
This way you can easily find the correct position of the
actuator on reassembly, and the actuator cannot cause
a malfunction.
Further instructions for detaching the actuator in Chap-
ter 4!
Switch off the energy supply of the actuator.
□
Detach the actuator.
□
Support the valve carefully with a hoist. Place lifting
ropes in a correct position on the body (not on the shaft)
of the valve.(see Figure 10)
□
Demount the valve by unscrewing the opposite pipe
flange bolts crosswise.
□
Lift and transport the valve carefully to protect it from
damage.
Figure 9
Correct position of lifting ropes
3.6
Cleaning and maintenance interval
Type BO high performance butterfly valves are extensively
maintenance-free.
For cleaning, use only a soft and lint-free cloth. Do not
under any circumstances use pointed or sharp tools (knife,
file, screwdriver, etc…) or sandpaper. Similarly, do not use
any cleaning agents that may cause undesirable chemical
reactions with the residues of the medium or attack the
sealing elements.
Check the tightness of the valve at regular intervals.
You should replace the sealing element (320) after two
years at the latest.
At the same time, check the condition of the following
parts and change them if necessary:
O-rings (472, 474),
U-ring (475),
bearing bushings (410, 424)
After dismantling the valve, you must replace the lock-
ing plate (447).
For ordering the necessary spare parts set, please contact
your Metso Service Partner.
Figure 10
Sealings and bushes
CAUTION: Danger of explosion!
Follow the end user safety instructions!
424
447
475
475
474
472
410
320
474
424
472
411
