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12.3.2 Mounting a
concave diaphragm
Diaphragm size 8
Push-fit diaphragm:
CAUTION
Diaphragm may be damaged if the
compressor is wound down too far!
G
Take care not to wind down the
compressor beyond the max. area
(see picture / grey arrows).
Tab
Fastening
spigot
Recess of compressor
1. Move bonnet
A
to the closed position.
2. Place the diaphragm
2
with the fastening
spigot in an inclined position at the
recess of the compressor.
3. Turn the diaphragm as manual force
is applied to push the spigot into the
compressor.
4. Align diaphragm tab (identifying
manufacturer and material) in parallel to
compressor weir.
Diaphragm sizes 10 - 100
Threaded pin type diaphragm:
Diaphragm boss
Recess of compressor
Diaphragm
pin
1. Move bonnet
A
to the closed position.
2. Place the compressor loosely on the
bonnet spindle, fit
A
into
B
and
D
into
C
(see chapter 12.3.1 "General
information").
3. Check if the compressor fits closely in
the guides.
4. Screw new diaphragm tightly into the
compressor manually.
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 anticlockwise until its bolt
holes are in correct alignment with the
bolt holes of the bonnet.
