Bonnet Mounting On The Valve Body - GEM 611 Manual

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 bonnet.
11.3.3 Mounting a
convex diaphragm
1. Move bonnet A to the closed position.
2. GEMÜ 671: Place the compressor
loosely on the valve spindle, fi t the wings
into the guides and ensure that the anti-
twist protection is engaged (see chapter
11.3.1 "General notes").
3. Check if the compressor fi ts closely in
the guides. Invert the new diaphragm
face manually; use a clean, padded mat
with bigger nominal sizes.
Diaphragm face
4. Position the new backing diaphragm
onto the compressor.
5. Position the diaphragm face onto the
backing diaphragm.
6. Screw diaphragm face tightly into the
compressor manually. The diaphragm
boss must fi t closely in the recess of the
compressor.
611, 671_us
Adapter
Compressor
Backing
diaphragm
7. If it is diffi cult to screw it in, check the
thread, replace damaged parts.
8. 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.
9. 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.
11.4 Bonnet mounting
1. Move bonnet A to the closed position.
2. Open bonnet A approx. 20 %. Position
bonnet A with the mounted diaphragm
2 on the valve body 1, take care to align
the diaphragm weir and valve body weir.
3. Insert the bolts through the bonnet and
Threaded pin
body. 611: Insert bolt 18 from the bonnet
side and the washer 19 and nut 20 from
the body side.
671 DN 15 - DN 80: Insert the bolts 18
and washers 19 from the body side.
671 DN 100: Insert the washers 19 and
the nuts 20 from the bonnet side.
Initially hand tighten only.
4. Fully tighten the bolts 18 (GEMÜ 671
DN 100: nuts) diagonally.
5. Ensure that the diaphragm 2 is
compressed evenly (approx. 10-15 %,
visible by an even bulge to the outside).
6. Check tightness of completely
assembled valve.
30 / 40
Recess of compressor
Diaphragm boss
on the valve body
Threaded pin