Bonnet Mounting On The Valve Body; Commissioning - GEM 643 Series Installation, Operating And Maintenance Instructions

Adapter Recess of compressor
Com-
pressor
Backing
diaphragm
Diaphragm face Diaphragm boss
8. If it is diffi cult to screw it in, check the
thread, replace damaged parts.
9. 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.
10. Press the diaphragm face tightly onto
the backing diaphragm manually so that
it returns to its original shape and fi ts
closely on the backing diaphragm.
12.4 Bonnet mounting
on the valve body
1. Move bonnet A to the closed 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. Mount washers 19 and nuts 20.
Initially hand tighten only.
5. Fully tighten the nuts 20 diagonally.
6. Ensure that the diaphragm 2 is
compressed evenly (approx. 10-15 %,
visible by an even bulge to the outside).
7. Check tightness of completely
assembled valve.
Diaphragm pin

13 Commissioning

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
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 degrade in the course
of time. After valve installation
and commissioning make sure to
tighten the nuts 20 (see chapter
20 "Sectional drawing and spare
parts").
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
643