Mounting A Concave Diaphragm; Mounting A Convex Diaphragm - GEM 643 Series Installation, Operating And Maintenance Instructions

The compressor is loose.
Compressor and bonnet fl ange seen from
below:
C
D
Place the compressor loosely on the bonnet
spindle, fi t the grooves D into the guides C.
The compressor must be able to be moved
freely between the guides!
12.3.2 Mounting a
concave diaphragm
Recess of compressor
Diaphragm boss
1. Move bonnet A to the closed position.
2. Place the compressor loosely on the
bonnet spindle, fi t the grooves D into the
guides C (see chapter 12.3.1 "General
information").
3. Check if the compressor fi ts closely in
the guides.
4. Screw new diaphragm tightly into the
compressor manually.
5. Check if the diaphragm boss fi ts closely
in the recess of the compressor.
643
D
C
Diaphragm
pin
24 / 32
6. If it is diffi cult 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.
12.3.3 Mounting a
convex diaphragm
1. Move bonnet A to the closed position.
2. Place the compressor loosely on the
bonnet spindle, fi t the grooves D into the
guides C (see chapter 12.3.1 "General
information").
3. Check if the compressor fi ts closely in
the guides.
4. Invert the new diaphragm face manually;
use a clean, padded mat with bigger
nominal sizes.
I.
II.
Diaphragm face
III.
5. Position the new backing diaphragm
onto the compressor.
6. Position the diaphragm face onto the
backing diaphragm.
7. Screw diaphragm face tightly into the
compressor manually. The diaphragm
boss must fi t closely in the recess of the
compressor.
Diaphragm pin