2 BW 70 en
13
10.2
Preliminary
In order to avoid longer shutdowns during the mainte-
nance work, suitable spare parts should be kept ready or
procured in time. Take the delivery times and transporta-
tion into account.
□
Ensure that the pipeline is free of pressure and free of
process gases and fluids.
□
Check that the disc valve has cooled down or warmed
up to the extent that there is no longer any risk of
extreme temperatures.
□
Find out which medium passed through the valve when
before it was dismanteled from the pipeline. There could
be residues in the valve. Ensure that there is no risk of poi-
son or acid when coming into contact with the residues.
Appropriate protective clothing, eye protections and respi-
ratory protection shall be used. The operator’s safety
instructions must be followed.
□
When installing and dismounting the disc valve, the
valve must be closed in order to rule out damage during
installation and dismounting.
10.3
Demounting
When dismounting the disc valve, please proceed as fol-
lows:
□
Close the disc valve.
□
If the actuator must be removed from the disc valve,
mark the position of the actuator to the bracket and to
the body with a permanent marker before dismounting
(see Figure 15). In this way, you can find the right posi-
tion of the actuator when re-mounting, and it cannot
trigger a malfunction.
Fig. 15
Marking the position of the actuator
□
Switch off the power supply of the actuator.
Dismount the actuator. For further instructions, see Section
4.5 in this IMO.
□
Support the disc valve with lifting ropes. Put the lifting
ropes on the body (not on the shaft) of the disc valve.
□
Remove the disc valve by loosening the screws or nuts
(opposite to each other) crosswise.
□
Transport the disc valve in such a way that it cannot
move or be damaged during transportation.
10.4
Reassembly
To re-install the disc valve please proceed as follows:
□
Close the disc valve.
□
Make sure the marking at the actuator shaft is inline
with the marking on the body when reinstalling the
valve (see Figure 16).
□
There is a marking at the end of the actuator shaft and
on the shaft extension of the disc valve. The marking at
the actuator shaft must be in line with the marking on
the body when re-installing the valve.
□
When the markings are aligned, the valve is closed
Fig. 16
Installation markings
□
Put the actuator in the closed position.
□
Ensure that the actuator is placed in the correct position
on the actuator shaft by using the marking made on the
bracket and the actuator when the valve was dis-
mounted (see Chapter 4). The aligment shall be as exact
as possible for all components (body – bridge – actua-
tor). Use the same marking for this that you made on the
bracket and on the actuator when you dismounted the
valve, and ensure as exact alignment of all parts (body –
bridge – actuator) as is possible (see Chapter 4)
□
Install the disc valve to the pipeline (see Chapter 3).
Marking
Marking on the
actuator shaft
