7. Screw diaphragm face tightly into the
compressor manually. The diaphragm
boss must
fi
t closely in the recess of the
compressor.
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 actuator.
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 Actuator mounting
on valve body
1. Move actuator
A
to the open position.
2. Position actuator
A
with the mounted
diaphragm
2
on the valve body
1
, take
care to align the diaphragm weir and
valve body weir.
3. GEMÜ 658: Insert the bolts
18
and
washers
19
from the body side.
GEMÜ 688: Insert the washers
19
and
bolts
18
from the body side and
the washers
19
and nuts
20
from the
actuator side.
Initially hand tighten only.
4. Move actuator
A
to the closed position.
5. Fully tighten the bolts
18
or 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 bolts
18
or nuts
20
(see
chapter 20 "Sectional drawings
and spare parts") (at the very latest
after the first sterilisation process).
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
diaphragm valve (to remove any harmful
foreign matter).
Cleaning:
The plant operator is responsible for
selecting the cleaning material and
performing the procedure.
35 / 44
658, 688
Summary of Contents for 658
Page 42: ...42 44 658 688 ...
Page 43: ...43 44 658 688 ...