M4602-02en Edition 09/2022 21
Description
3
The FLUDEX couplings described here are universally applicable hydrodynamic hydraulic
couplings in various designs and sizes, which operate according to the Föttinger principle.
The couplings can be used in accordance with the Explosion Protection Directive in poten-
tially explosive atmospheres if they have a corresponding marking.
The coupling parts of the input and output side are not mechanically connected to each
other. Torque transmission takes place via the fluid filling flowing in the coupling, which is
driven via radially arranged blades. A small amount of speed slip occurs here during continu-
ous operation.
FLUDEX couplings are suitable for both directions of rotation.
FLUDEX couplings from the FN series can be installed in a horizontal, inclined or vertical po-
sition. They are suitable for use with oil.
In case of a steeply inclined or vertical mounting position, the hub carrier part (120) (large
prechamber) must be attached at the bottom. The drive should preferably be directed via the
hub carrier part (120) to the outer wheel (blade shell 101) to enable the advantages of the
prechamber (7) and the working chamber geometry to be utilised.
If the coupling overheats, e.g. due to the driven machine being overloaded, the operating
fluid escapes due to the fusible safety plug being activated and the drive is disconnected.
To prevent the operating fluid from spraying out, an electronically or mechanically controlled
thermal monitoring device can be used. Information on the monitoring devices can be found
in separate operating instructions.
The delivery is “ready for operation” with or without liquid filling, depending on the order.
Couplings filled with operating oil are marked with a corresponding sticker (“... L, HLP 32 DIN
51524/2, operating oil already filled in”) near the filling opening. A fusible safety plug (and a
thermal circuit breaker depending on the version) with sealing rings, as well as a retaining
washer and a retaining screw, if provided, are supplied loose with each coupling.
These instructions describe the assembly and operation of an FLUDEX coupling arranged
horizontally with a shaft-hub connection made by a cylindrical or conical bore with parallel
key. Please consult Flender if you want to use a different type of installation.
The order-specific data for a delivery shall be listed on the order-dependent title page,
provided they are known for the order. This title page then counts as the dimension drawing
and deviates from the title page saved on the Internet. However, the contents of the operat-
ing instructions are identical in each case. Information on the title page or on an order-de-
pendent drawing shall have priority.
Application
FLUDEX couplings are designed for use in all kinds of machines.
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