SIEMENS
FLENDER Standard Couplings
Fluid Couplings — FLUDEX Series
General information
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Siemens MD 10.1 · 2015
13
Operation of the delay chamber
Starting torque can be reduced without increasing continuous
operating slip by using a type of coupling with a delay chamber.
On these couplings part of the oil filling is initially stored inac-
tively in the delay chamber. The starting torque is considerably
reduced because of the thus reduced starting filling in the work-
ing chamber of the coupling. The filling in the delay chamber
runs very slowly, mostly only at the finish of the starting opera-
tion, from the delay chamber into the working chamber, causing
the active filling in it to rise gradually and the continuous operat-
ing slip to reach a value corresponding to the whole filling.
■
Technical data
Balancing FLUDEX couplings
In deviation from the balancing specifications in catalog section
2, all FLUDEX couplings complying with DIN ISO 1940 are bal-
anced to balancing quality G6.3 for 1800 rpm. For operating
speeds higher than 1800 rpm micro-balancing, based on oper-
ating speed, can be requested (order code +W03 required).
Balancing is a two-level balancing with the specified oil quantity
or a 75 % filling.
FLUDEX couplings are balanced in accordance with the half
parallel key standard. Other balancing standards must be spec-
ified in the order, using the article number key
(see catalog sec-
tion 2).
Add-on couplings are subject to the standards
as set out in
catalog section 2.
Oil filling
FLUDEX couplings can be delivered with or without oil filling.
•
Delivery without oil filling:
without order code
•
Delivery with oil filling:
article number with
"-Z"
and order code
"F16"
and
"Y90"
with
plain text specification of the oil filling quantity in liters.
•
Delivery without oil filling but with oil filling quantity specifica-
tion: Article number with
"-Z"
and order code
"Y90"
with plain
text specification of the oil filling quantity in liters.
Hollow shafts of the FA, FG and FV series
Variant of FLUDEX hollow shafts only with finished bore:
Order code for bore diameter is required.
Operating temperature range of FLUDEX couplings
FLUDEX couplings are suitable for ambient temperatures of
between -40 °C and +40 °C.
For use at temperatures below -15 °C, FLUDEX couplings are
exclusively delivered with NBR seals (Perbunan).
For use at temperatures below -20 °C, FLUDEX couplings are
generally delivered without oil filling.
For the selection of the operating oil for low temperatures, atten-
tion must be paid to a sufficient low freezing point of the oil and
his compatibility to sealing elements.
The temperature limits of the N-EUPEX add-on coupling are
shown in part 7 of this cataloge.
If other displacement couplings are combined with a FLUDEX
coupling, their respective temperature limits must be taken into
account.
Operating conditions for FLUDEX couplings in potentially
explosive atmospheres
The coupling with fusible safety plugs with identity marking
T3
is suitable for the operating conditions set out in the current ATEX
Directive:
•
Equipment group II (above-ground applications) temperature
class T3 of categories 2 and 3 for environments where there
are potentially explosive gas, vapors, mist and air mixtures
and for environments where dust can form potentially explo-
sive atmospheres.
•
Equipment group I (below-ground applications) of category M2
If used in potentially explosive environments under ground,
aluminum couplings must be provided with a robust enclo-
sure to preclude the risk of ignition caused by e.g. friction,
impact or friction sparks. The deposit of heavy-metal ox-
ides (rust) on the coupling housing must be prevented by
the enclosure or other suitable means.
FLUDEX couplings can be delivered with fitted brake disk
or V-belt pulley.
Designing the belt drive or the brake disk to conform with
the guidelines is the responsibility of the subassembly sup-
plier. It should be noted that there is a risk from, amongst
other things, electrostatic charges and hot surfaces.
Under BGR 132 (regulations of German Institute for Occu-
pational Safety) the use of V-belts in conjunction with IIC
gases is not permitted.
Off
Starting
Continuous operation
G_MD10_EN_00115
© Siemens AG 2015