Table of Contents
Advertisement
12.3.3 Mounting a
convex diaphragm
1. Move bonnet A to the closed position.
2. Place the compressor loosely on the
bonnet spindle, fit A into B and D
into C (see chapter 12.3.1 "General
information").
3. Check if the compressor fits closely in
the guides.
4. Invert the new diaphragm face manually;
use a clean, padded mat with bigger
nominal sizes.
I.
II.
Diaphragm face
III.
5. Position the new backing diaphragm
onto the compressor.
6. Position the diaphragm face onto the
backing diaphragm.
7. 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
8. If it is difficult 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 fits
closely on the backing diaphragm.
12.4 Bonnet mounting
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. Tighten bolts 18, washers 19 and
nuts 20 by hand (hand tight only)
(fastening elements may vary dependent
on diaphragm size and / or valve body
version).
5. Fully tighten the bolts 18 with nuts 20
diagonally.
Diaphragm pin
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
19 / 28
on the valve body
Important:
Service and maintenance:
Diaphragms degrade in the course
of time. After valve disassembly /
assembly check that the bolts and
nuts on the body are tight and
retighten as necessary (at the very
latest after the first sterilisation
process).
653, 654
Advertisement
Table of Contents
