417101382_MFV_II-III.doc
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Rev: 5-02/10
6
Maintenance
WARNING
The maintenance may only be carried out by professional and authorised persons.
Fig. 6.1
Pos.
Description
13
casing screws
R
return line
Recommended is to control the following:
- Suction and pressure lines for leak-free connections
- Return line (
R
) at the valve (breakage of the diaphragm)
- Proper fitting of the casing screws (Pos.
13
(3 - 4 Nm))
6.1
Replacement of the Diaphragm
Switch the metering pump off and empty the pressure line (see chapter
4.1
Functional
Description, section d) emptying function). Loosen the casing screws (Pos.
13
) and remove
the valve lid (Pos.
14
). Remove the sealing plug (Pos.
10
) on the operation button either
manually or with a small screwdriver. Loosen the screw (Pos.
11
) and replace the diaphragm
(Pos.
15
). Tighten the casing screws diagonally equally (3-4 Nm).
Fig. 6.2
Pos.
Description
10
sealing plug
11
screws
13
casing screws
14
valve lid
15
diaphragm
13
14
11
10
15
WARNING
The diaphragm must be held when the screw (Pos.
11
) is being loosened due to the spring
tension.
)
NOTE
The tightening torque of the valve screws must be re-tightened after 24 hours. The
tightening torque is 3-4 Nm.
