Hydraulic systems & components


A new coupling system

3rd Quarter 2013 Hydraulic systems & components

For more than 80 years Parker Hannifin, a specialist in motion and control technologies, has been developing high pressure hydraulic couplings and setting standards globally. Over the years, new geometries and materials have improved the performance, reliability and ease of installation of the original Ermeto couplings. Today, leakages in piping systems cannot be ascribed to material defects as they could previously but rather to improper installation.

When it comes to couplings, correct installation is essential because the effects of leakages can result in cost-intensive downtimes, customer complaints, reworking, environmental damage and even accidents. With the new, quickly installable EO-3 system, Parker Hannifin has developed a coupling concept that sets new standards.

EO-3 couplings enable simpler, quicker and more secure installations. This is achieved with a new thread technology. In contrast to all prior DIN standard couplings, the EO-3 system is based on a 24° inner cone with integrated soft seal and a cone-shaped connecting thread. A world first, this unique system enables the control of installation results from the outside. Using a yellow signal ring, the installer can tell immediately whether the coupling has been made correctly.

EO-3 couplings can be installed considerably quicker than conventional coupling systems on the market and require neither a torque wrench nor a wrench extension – a common open-ended wrench will suffice. With pipe sizes from 25 mm, an octagonal screw nut – instead of a standard hexagonal screw nut – makes access easier in tight construction spaces.

For the new bolt connections Parker uses the existing EO metal-forming machine tool. With the machines users have been using up until now to produce, for example, EO-2-shaped pipe couplings, users can also create EO-3 couplings – an important contribution to cost reduction. This merely requires the respective EO-3 forming dies.

In addition to rigid pipework, many applications demand flexible hose connections. The EO-3 is applicable in both variants. Linking to existing EO-2 connections is also possible without any problems using an adaptor. This means previous couplings can be converted or upgraded to the EO-3 system at virtually no additional cost. The new coupling system offers four times as much safety and does away with the standard LL, L, and S series classifications that have previously been customary. But for a few exceptions, a single pressure stage of 420 bar applies to all pipe sizes. Elastomeric materials can be selected for specific applications. Parker’s EO-3 coupling system can be used in rigid pipe connections and hose applications at temperatures from -40 to 120°C with external pipe diameters from 6 to 42 mm.

For more information contact Lisa de Beer, Parker Hannifin, +27 (0)11 961 0700, parker.southafrica@parker.com, www.parker.com/za



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