FLENDER Standard Couplings Fluid Couplings — FLUDEX Series © Siemens AG 2015 General information G_MD10_EN_00115 Off Starting Continuous operation 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).
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. 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).
Operating conditions for FLUDEX couplings in potentially explosive atmospheres Add-on couplings are subject to the standards as set out in catalog section 2. 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. 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. • 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. 13 Hollow shafts of the FA, FG and FV series 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. 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. 13/6 Siemens MD 10.1 · 2015