Technical
Answers to questions our customers ask us again and again – on materials, multi couplings, maintenance and assembly.
The limiting factor is not the brass but the seal. For standard seals: NBR up to +100 °C, EPDM up to +150 °C, FKM/Viton up to +160 °C with water or up to +200 °C with heat transfer oil. For higher temperatures, high-temperature seals and stainless steel versions are available. With water above 100 °C, the pressure must also be high enough to prevent the water from evaporating. Read more →
Yes. The AV aluminium collector is designed for temperatures from −20 to +200 °C and is therefore also suitable for heat transfer oil. Anodised aluminium is not suitable for corrosive liquids with a high chlorine content – the EV stainless steel collector is available for this. Read more →
Multi couplings for water and temperature control media usually have aluminium plates. Multi couplings for hydraulics, e.g. the RPC series, are made of steel to withstand the high pressures. Read more →
Yes, for example the PPT series according to ISO 7241-1 series B. Brass is corrosion-resistant but withstands less pressure than steel. The permissible operating pressure therefore depends on the material selected. Read more →
Temperature control couplings are designed for liquids. For compressed air we recommend dedicated pneumatic couplings, for example the PBP push-button coupling. Please contact us if you would like to combine both in one application. Read more →
In principle yes – pressure is not a problem for a hydraulic coupling. However, galvanised steel can corrode with water. Stainless steel versions or temperature control couplings, which offer more flow with lower pressure drop, are better suited for water. Read more →
It is possible, but with the number of circuits, coupling force, weight and space requirements increase. With very many circuits on one mould half, it can be more convenient to split them across two multi couplings, e.g. 2 × 12, for example by temperature range. Important: the nozzle side and ejector side are separate mould halves and always need their own multi couplings. We will be happy to advise you on the layout. Read more →
The locking block with lever connects with one movement – very fast and ideal for frequent mould changes; with Safety Lock (SL) it is secured against unintentional opening. With screw locking (SV), the plates are drawn together via a thread. This results in a very firm, backlash-free connection with high holding force, good for many circuits or vibrations – but connecting takes a little longer. Read more →
Yes, the locking block is available as a spare part and is screwed on. We recommend coordinating the replacement with us so that the version and safety lock match the existing multi coupling. Read more →
Yes, the centring pin is available as a spare part and can be replaced. Simply tell us the part number of your multi coupling. Read more →
That depends on the coupling and its application. Please contact us – we will tell you whether replacing the seals makes sense and which seal kit fits. Read more →
Common causes are dirt or particles on the front faces, limescale or dried-on medium, residual pressure in the line or damaged front faces. Remedy: clean the front faces before connecting, use protective caps, release residual pressure or use couplings with pressure relief, and filter the medium. If a valve sticks permanently, the coupling should be replaced. Read more →
Water or a little soapy water is best. Do not use oils or greases that could attack the hose material, and no silicone spray if parts are to be painted or bonded later. It also helps to dip the hose end briefly in warm water and to use the appropriate assembly tool. Read more →
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