Bonnet Mounting On The Valve Body; Commissioning - Gemü 675 Original Einbau- Und Montageanleitung

onto the compressor.
4. Position the diaphragm face onto the
backing diaphragm.
5. Screw diaphragm face tightly into the
compressor manually. The diaphragm
boss must fit closely in the recess of the
compressor.
Adapter Recess of compressor
Com-
pressor
Backing
diaphragm
Diaphragm face Diaphragm boss
6. If it is difficult to screw it in, check the
thread, replace damaged parts.
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.
8. Press the diaphragm face tightly onto
the backing diaphragm manually so that
it returns to its original shape and fits
closely on the backing diaphragm.
11.4 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,
aligning the diaphragm weir and valve
body weir.
4. Insert and tighten the bolts 18,
washers 19 and nuts 20 by hand
(hand tight only).
5. Fully tighten the bolts 18 with 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

12 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
diaphragm valve (to remove any harmful
foreign matter).
Cleaning:
The plant operator is responsible for

selecting the cleaning material and
performing the procedure.
27 / 32
Important:
Service and maintenance:
Diaphragms degrade in the course
of time. After valve assembly /
disassembly check that the
bolts 18 and nuts 20 on the
body are tight and retighten as
necessary.
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
675