GEM 660 Operating Instructions Manual page 30

15 Inspection and maintenance
The collar of the distance sleeves must point to the dia-
phragm weir (body side).
▶ Mount the correct diaphragm that suits the valve (suit-
able for medium, medium concentration, temperature and
pressure). The shut-off diaphragm is a wearing part.
Check the technical condition and function of the valve
before commissioning and during the whole duration of
use. Carry out checks regularly and determine the check
intervals in accordance with the conditions of use and/or
the regulatory codes and provisions applicable for this
application.
▶ If the diaphragm is not screwed into the adapter far
enough, the closing force is transmitted directly onto the
diaphragm pin and not via the compressor. This will
cause damage and early failure of the diaphragm and
leakage of the valve. If the diaphragm is screwed in too
far, perfect sealing at the valve seat will not be achieved.
The function of the valve is no longer ensured.
▶ An incorrectly mounted diaphragm may cause valve leak-
age/emission of medium. In this case, remove the dia-
phragm, check the complete valve and diaphragm and re-
assemble, proceeding as in the instructions above.
Diaphragm size 8:
The compressor is fixed to the spindle.
Compressor and actuator flange seen from below:
GEMÜ 660
NOTICE
NOTICE
NOTICE
Diaphragm size 10:
The compressor is loose.
Compressor and actuator flange seen from below:
Figure 1
B
D
Figure 2
C
A
A double flat A (arrows in figure 2) is fitted at the end of the
actuator spindle to protect the piston against twisting. When
mounting the compressor, the double flat A must be in correct
alignment with the recess B of the compressor back (arrows
in figure 1).
If the actuator piston is not in the correct position, it must be
turned to the correct position. The position of the double
flat A is offset by 45° to the position of C.
Place the compressor loosely on the actuator piston, fit the re-
cesses D into the guides C and A into B. It must be possible to
move the compressor freely in the guides.
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D
B
45°
A
C
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