EB 2640 EN
23
Cleaning and maintenance
section) to get access to the plug stem (19)
and diaphragms (4.1).
How to proceed
1.
Undo and remove the four screws (16,
width across flats 13). Keep in a safe
place for later.
2.
Use an Allen key (6 mm) to unthread the
stopper (15.2). Unscrew the stop screw
(15). Make sure that the inserted washer
(15.1) does not get lost. Keep in a safe
place for later.
3.
The grub screw with trunnion (12.1) acts
as a locking pin and prevents the cover
(1.1) and plug stem (19) from being
pulled off separately. Turn the grub screw
to the point where it is still held in place
by the thread.
Note:
The plug stem is guided by ball bear
-
ings in the cover (valve bonnet). On
pulling off the cover, the ball bear
-
ings embedded in food grade lubri
-
cant are exposed and might fall out.
4. Carefully pull off the cover.
5.
Undo the grub screw (12.1). Dismantle
the plug stem (19) and plug support (18)
that are bolted together.
6.
Remove the diaphragms (21) along with
the internal and external spacing rings
(20).
7.
After replacing the diaphragms: Assem-
ble in the reverse order. Tighten the four
screws (16) with a tightening torque of
30 Nm.
15
15.1
15.2
21
1.1
1
4.1
12.1
19
16
20
18
Fig. 13:
Replacing the two diaphragms in Type 2173-10
1
Valve body
1.1
Cover
4.1
Two diaphragms
12.1
Grub screw with trunnion
15
Mechanical stop (screw)
15.1
Retaining washer
15.2 Stopper
16
Screws (4 pcs./width across flats
SW 13)
18
Plug support
19
Plug stem
20
Spacing rings
21
Ball bearings
