4.2.1 Mixing valve
Disassembly
1. Unthread stem connector nut (6.1) and
lock nut (6.2) from the plug stem of
valves in DN 50 and smaller.
2. Unthread coupling nut (5.1) from the
bellows housing. Remove nuts (1.1) and
lift off flange (5.4).
3. Pull out bellows housing (5.2) and bel-
lows assembly as far as they will go.
Place an open-end wrench (SW 10 for
valves
£
DN 50 or SW 13 for valves
³
DN 65) at the side on the hexagon (X)
or at the flattened area of the plug stem
to hold the stem stationary. Undo nut
(12) and remove wrench.
4. Unthread nut (12). Remove the two lock
washers (12.2) and washer (12.1).
For valves in DN 32 to 80, pull bottom
sleeve (10.3 or 11.4) off the plug stem.
5. Lift bellows housing (5.2) together with
the bellows assembly (5) and carefully
pull the plug stem (6) out of the valve
body.
Pull the bellows assembly (5) out of the
bellows housing and remove the body
gasket (1.2).
Carefully clean all parts and check them
for damage.
Replace defective parts with new ones.
6. For valves in DN 32 and larger, remove
sleeve (10.1 or 11.1).
Unscrew the top seat (2.1) using a suit-
able seat wrench (see table on page 20).
7.
DN 15 to 25
Lift plug (3) out of the body.
DN 32 to 50
Lift top plug (3.1), sleeve (10.2) and bot-
tom plug (3.2) out of the body.
DN 65 and 80
Lift top plug (3.1), sleeves (11.2 and
11.3) and bottom plug (3.2) out of the
body.
8. Unscrew the bottom seat (2.2) from of
the body.
Clean all parts. Check them and, if nec-
essary, machine them or replace them
with new parts.
EB 8135/8136 EN
13
Maintenance–replacing parts
2.2
2.1
12.1
12.2
12
3
Fig. 8 · Mixing valve DN 15 to 25
12.1
12.2
12
11.1
11.2
11.3
11.4
3.1
3.2
Fig. 9 · Mixing valve DN 65 and 80
