Mounting A Concave Diaphragm - Gemü R690 Betriebsanleitung

15 Inspection and maintenance
▶ 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
thus 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.
The compressor is loose on all diaphragm sizes.
Compressor and actuator flange seen from below:
1. With diaphragm size 25 + 40: Place the washer (arrow)
loosely on the actuator spindle.
GEMÜ R690
NOTICE
NOTICE
2. Place the compressor loosely on the washer, fit the
grooves into the guides (arrows).

15.2.3.2 Mounting a concave diaphragm

Recess of compressor
1. Move the actuator A to the closed position.
2. With diaphragm size 25 + 40: Place the washer loosely on
the actuator spindle. Place the compressor loosely on the
washer, fit the recesses into the guides (see chapter "Gen-
eral information").
3. Check if the compressor fits closely in the guides.
4. Manually screw the new diaphragm into the compressor
tightly.
5. Check if the diaphragm boss fits closely in the recess of
the compressor.
6. If it is difficult to screw it in, check the thread, replace
damaged parts (only use genuine parts from GEMÜ).
7. When clear resistance is felt, turn back the diaphragm an-
ticlockwise until its bolt holes are in correct alignment
with the bolt holes of the actuator.
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Diaphragm pin
Diaphragm boss
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