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Cleaning and maintenance
Note
The plug stem is guided by ball bearings in
the guide flange. On pulling off the guide
flange, the ball bearings embedded in food
grade lubricant are exposed and might fall
out.
6. Carefully pull off the guide flange (5).
Take the ball bearings out of the guiding
grooves and keep them at hand for the
following assembly.
7. Replace the diaphragm unit with a new
one.
8. Reassemble the parts in the reverse order.
Carefully place the actuator housing onto
the valve body. Make sure that the thread-
ed bore at the side is aligned with the
locking screw and that the diaphragm
rests neatly in place.
9. Position the clamp fitting. Grease the
groove and screw with food grade lubri-
cant. Hit the clamp lightly with a plastic
hammer and tighten the clamp screw
again until the parts fit properly.
Type 2371-11 · Replacing the diaphragm
unit together with the flange section
The diaphragm is replaced as a complete unit
together with the guide flange (5), plug stem
(3.2) inside of it as well as the plug support
(3.1). It may be necessary to replace the dia-
phragm assembly when too much clearance
arises between the guide flange and plug
stem after a long service life.
How to proceed:
See section 6.4 on page 21.
22
3.2
5
4
3.1
Type 2371-11 ∙ Guide flange (5), inside plug stem
(3.2), diaphragm (4) and plug support (3.1) ∙ The plug
must be unscrewed for removal.
Fig. 12: Replacing the diaphragm unit together
with the flange section
6.5 Replacing the two dia-
phragms
Type 2371-10 · Two diaphragms
The two diaphragms are clamped from the
outside between the valve body (1) and cover
(1.1). Inside the plug support and plug stem
that are bolted together guide the dia-
phragms. The internal and external spacing
rings (20) are located between the two dia-
phragms.
To replace the diaphragms, first pull the cover
(valve bonnet) off the valve body (bottom sec-
tion) to get access to the plug stem (19) and
diaphragms (4.1).
EB 2640 EN
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