General Information; 12.3.2 Mounting A Concave Diaphragm; 12.3.3 Mounting A Convex Diaphragm - GEM 600 Installation, Operating And Maintenance Instructions

Diaphragm sizes 25 - 50:
The compressor is loose.
Place the washer 1
G
loosely on the
actuator spindle.
Place the com-
G
pressor loosely
on the washer 1,
fi t the wings 2 into
the guides.
DN 15-25
(diaphragm size 25)

12.3.2 Mounting a concave diaphragm

Recess of compressor
Diaphragm boss
1. Move actuator A to the closed position.
2. Diaphragm size 10: Place the compressor
loosely on the actuator spindle, fi t the
wings into the guides (see chapter

12.3.1 "General information").

Diaphragm size 25 - 50: Place the
washer loosely on the actuator spindle.
Place the compressor loosely on the
washer, fi t the wings into the guides (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.
6. If it is diffi cult to screw it in, check the
thread, replace damaged parts (only use
genuine parts from GEMÜ).
600, 630
DN 32-50
(diaphragm sizes 40-50)
Diaphragm
pin
34 / 44
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 actuator.

12.3.3 Mounting a convex diaphragm

1. Move actuator A to the closed position.
2. Diaphragm size 25 - 50: Place the washer
loosely on the actuator spindle. Place
the compressor loosely on the washer,
fi t the wings into the guides (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.
Adapter Recess of compressor
Com-
pressor
Backing
diaphragm
Diaphragm face Diaphragm boss
Diaphragm pin
Diaphragm pin