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643
Diaphragm boss
Recess of compressor
Com-
pressor
Adapter
Backing
diaphragm
Diaphragm face
Diaphragm pin
8. If it is di
ffi
cult to screw it in, check the
thread, replace damaged parts.
9. When clear resistance is felt turn back
the diaphragm anticlockwise until its bolt
holes are in correct alignment with the
bolt holes of the bonnet.
10. Press the diaphragm face tightly onto
the backing diaphragm manually so that
it returns to its original shape and
fi
ts
closely on the backing diaphragm.
12.4 Bonnet mounting
on the valve body
1. Move bonnet
A
to the closed position.
2. Open bonnet
A
approx. 20 %.
3. Position bonnet
A
with the mounted
diaphragm
2
on the valve body
1
, take
care to align the compressor weir and
valve body weir.
4. Mount washers
19
and nuts
20
.
Initially hand tighten only.
5. Fully tighten the nuts
20
diagonally.
6. Ensure that the diaphragm
2
is
compressed evenly (approx. 10-15 %,
visible by an even bulge to the outside).
7. Check tightness of completely
assembled valve.
Important:
Diaphragms degrade in the course
of time. After valve installation
and commissioning make sure to
tighten the nuts
20
(see chapter
20 "Sectional drawing and spare
parts").
13 Commissioning
WARNING
Corrosive chemicals!
®
Risk of caustic burns!
G
Check the tightness of the
media connections prior to
commissioning!
G
Use only the appropriate
protective gear when
performing the tightness
check.
CAUTION
Protect against leakage!
G
Provide precautionary measures
against exceeding the maximum
permitted pressures caused by
pressure surges (water hammer).
Prior to cleaning or commissioning the
plant:
G
Check the tightness and the function of
the diaphragm valve (close and reopen
the diaphragm valve).
G
If the plant is new and after repairs rinse
the piping system with a fully opened
valve (to remove any harmful foreign
matter).
Cleaning:
The plant operator is responsible for
selecting the cleaning material and
performing the procedure.
Содержание 643 Series
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