Mounting A Concave Diaphragm - GEM 620 Series Installation, Operating And Maintenance Instructions

Diaphragm sizes 25-50 (DN 15-50):
The compressor is loose.
Diaphragm sizes 65-150 (DN 65-150):
The compressor is fi xed to the spindle.
Diaphragm sizes 25 - 50 (DN 15 - 50):
Compressor and actuator fl ange seen from
below:
Place the compressor loosely on the valve
spindle, fi t the grooves into the guides
(arrows).
Diaphragm sizes 65, 80 (DN 65, 80):
Compressor and actuator fl ange seen from
below:
Diaphragm sizes 100, 125 (DN 100, 125):
Compressor and actuator fl ange seen from
below:
620_us
Diaphragm size 150 (DN 150):
Compressor and actuator fl ange seen from
below:
12.3.2 Mounting a
concave diaphragm
Recess of compressor
Diaphragm boss
1. Move actuator A to the closed position.
2. Diaphragm sizes 25-50 (DN 15-50):
Place the compressor loosely on the
valve spindle, fi t the grooves into the
guides (see chapter 12.3.1 "General
notes").
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).
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.
30 / 40
Threaded pin