3 Operation
Operating instructions depend on the actua
-
tor used. Refer to the mounting and operat
-
ing instructions for the appropriate actuator.
4 Maintenance–replacing parts
The valve is subject to wear and tear, espe
-
cially at the seat, plug, bellows seal and
packing.
Depending on the application conditions
that prevail, the valve must be inspected at
appropriately scheduled intervals to prevent
any problems before they occur.
If any leaks occur to the atmosphere, the
packing may leak. If the valve does not shut
off properly, this may be because tight
shut-off is prevented by dirt or other impuri
-
ties between the seat and plug or because
their facings have been damaged.
Valves in DN 15 to 25 have a one-piece
plug with the same arrangement for both
mixing and diverting valves.
Valves in DN 32 and larger have two V-port
plugs. In mixing valves, the plugs move in-
wards into the seats, whereas the plugs of
the diverting valves move outwards into the
seats.
To keep the exact position of the plug,
spacer sleeves are used to keep the plug on
the plug stem. The different arrangement for
valves in DN 32 to 50 and for valves in
DN 65 and 80 as mixing and diverting
valves is specified in the section on assem
-
bly.
We recommend removing the parts, thor
-
oughly cleaning them, and replacing them
with new parts, if necessary.
Operation
8 EB 8135/8136 EN
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