Mounting The Diaphragm; Removing The Diaphragm - GEM 687 Operating Instructions Manual

16 Inspection and maintenance

16.2.2 Removing the diaphragm

▶ Before removing the diaphragm, please remove the actu-
ator, see "Valve disassembly (removing the actuator from
the body)".
1. Unscrew the diaphragm.
ð Please note: Depending on the version, the com-
pressor may fall out.
2. Clean all parts of remains of product and contaminants.
Do not scratch or damage parts during cleaning!
3. Check all parts for potential damage.
4. Replace damaged parts (only use genuine parts from
GEMÜ).

16.2.3 Mounting the diaphragm

▶ Fit the diaphragms suitable for the product (suitable for
medium, medium concentration, temperature and pres-
sure). The diaphragm is a wearing part. Check the tech-
nical condition and function of the product before com-
missioning and during the whole term 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 product. If the diaphragm is screwed in too
far, perfect sealing at the valve seat will not be achieved.
The function of the product is no longer ensured.
▶ Incorrectly mounted diaphragms cause the product leak-
age and emission of medium. In this case, remove the
diaphragms, check the complete valve and diaphragms
and reassemble again proceeding as described above.
16.2.3.1 Mounting the compressor
16.2.3.1.1 Diaphragm size 10-80 (DN 10-80)
Compressor
▶ Diaphragm sizes 10-80: the compressor is loose.
Diaphragm size 10 (DN 10-20)
Compressor and actuator flange seen from below:
GEMÜ 687
NOTICE
NOTICE
NOTICE
NOTICE
NOTICE
D
Anti-twist system of the spindle at the compressor
A double flat (A) is fitted at the end of the actuator spindle to
protect the spindle against twisting. When mounting the com-
pressor, the double flat must be in correct alignment with the
recess of the compressor back (B).
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. The compressor must be able to
be moved freely between the guides.
Diaphragm size 25-80 (DN 15-80)
Compressor and actuator flange seen from below:
C
Place the compressor loosely on the actuator spindle, fit the
recesses D into the guides C. The compressor must be able to
be moved freely between the guides.
38 / 44
C
A
45°
C
B
D
D
D
C
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