GEM 658 Operating Instructions Manual page 71

16.2.3 Mounting the diaphragm
16.2.3.1 General information
▶ Fit the diaphragm suitable for the valve (suitable for me-
dium, medium concentration, temperature and pressure).
The shut-off diaphragm is a wearing part. Check the tech-
nical condition and function of the valve before commis-
sioning and during the whole duration of use. Carry out
checks regularly and determine the check intervals in ac-
cordance 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.
▶ 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 again proceeding as described above.
▶ Follow the assembly instructions of the relevant dia-
phragms.
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NOTICE
NOTICE
NOTICE
NOTICE
The compressor is loose on all diaphragm sizes.
Diaphragm size 10 (DN 10–15):
Compressor and actuator flange seen from below:
Picture 1
Picture 2
Anti-twist system of the spindle at the compressor
A double flat (arrows in figure 2) is fitted at the end of the ac-
tuator spindle to protect the actuator spindle against twisting.
When mounting the compressor, the double flat must be in
correct alignment with the recess of the compressor back (ar-
rows in figure 1).
If the actuator spindle is not in the correct position, it must be
turned to the correct position. The position of A is offset by
45° to the position of C.
Place the compressor loosely on the actuator spindle, fit the
recesses D into the guides C and A into B. The compressor
must be able to be moved freely between the guides.
Diaphragm size 25–50 (DN 15–50):
Compressor and actuator flange seen from below:
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16 Inspection and maintenance
D
B
B
D
C
A
A C
GEMÜ 658