12.3.2 Mounting A Concave Diaphragm; Bonnet Mounting On The Valve Body; Commissioning - Gemü R677 Original Einbau- Und Montageanleitung

12.3.2 Mounting a concave diaphragm

Recess of compressor
Diaphragm boss
5. Move bonnet A to the closed position.
6. Check if the compressor fi ts closely in
the guides.
7. Screw new diaphragm tightly into the
compressor manually.
8. Check if the diaphragm boss fi ts closely
in the recess of the compressor.
9. If it is diffi cult to screw it in, check the
thread, replace damaged parts (only use
genuine parts from GEMÜ).
10. 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.
12.4 Bonnet mounting on the valve
body
1. Move bonnet A to the open position.
2. Open bonnet A approx. 20 %.
3. Position bonnet A with the mounted
diaphragm 2 on the valve body 1, take
care to align the compressor weir and
valve body weir.
4. Insert and tighten the bolts 18 with
washers 19 and nuts 20 by hand (hand
tight only).
5. Fully tighten the nuts 20 diagonally.
6. Put on the caps 39 again.
7. Ensure that the diaphragm 2 is
compressed evenly (approx. 10-15 %,
visible by an even bulge to the outside).
8. Check tightness of completely
assembled valve.
R677
Threaded pin
13
Protect against leakage!
Provide precautionary measures
G
against exceeding the maximum
permitted pressures caused by
pressure surges (water hammer).
Prior to cleaning or commissioning the
plant:
Check the tightness and the function of
G
the diaphragm valve (close and reopen
the diaphragm valve).
If the plant is new and after repairs rinse
G
the piping system with a fully opened
diaphragm valve (to remove any harmful
foreign matter).
Cleaning:
The plant operator is responsible for

selecting the cleaning material and
performing the procedure.
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Important:
Diaphragms set in the course
of time. After valve installation
and commissioning you must
retighten the nuts 20 (see chapter
20 "Sectional drawing and spare
parts").

Commissioning

WARNING
Corrosive chemicals!
® Risk of caustic burns!
Check the tightness of the
G
media connections prior to
commissioning!
Use only the appropriate
G
protective gear when
performing the tightness
check.
CAUTION