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7.2.1
Operating fluid
The fluid coupling must only be operated with water or a water emulsion. When using a water emulsion the
following must be observed:
─ Compatibility with the sealing material "NBR" (nitrile butadiene rubber).
─ pH value 5 to 8
The fluid should be mixed with only a small quantity of salts and contain only a sufficiently small
concentration of other additives. These requirements are normally met by drinking water.
Where orders are made without stating performance data, the filling quantity is not stamped on the
coupling. In these cases, for operation with water or water emulsion, the filling quantity for the respective
coupling size can be obtained from the fillingquantity tables in section 10, item 10.9 and item 10.10
dependent of the rotation speed and the output to be transmitted (e.g. the motor output).
NOTICE
Risk of damage to the coupling through improper storage
Damage to the coupling through freezing of operating fluid.
In case of types provided for operation with water, the water or water emulsion must be drained off before
storing at temperatures below 0 °C.
Frost hazard.
CAUTION
Risk of corrosion burns through chemical substances
Avoid burns when working with corrosive cleaning agents.
Observe manufacturer's instructions for handling cleaning agents and solvents.
Wear suitable personal protective equipment (gloves, safety glasses).
Not every FLUDEX coupling is suitable for use with water or water emulsion as an operating fluid.
FLUDEX couplings designed for water fillings are marked as follows in the area of
the filling plug (153): "
WARNING
Risk of serious injury through flying fragments
Risk of serious injury through flying fragments from burst coupling owning to overpressure.
If water or water emulsion is used as operating fluid, only fusible safety plugs with a maximum fusing
temperature of 110 °C are permitted to avoid high overpressure.
36
W".
FLUDEX 4612 en
Operating instructions 10/2017
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