Ermeto Tube Fittings
EO-Plus: Progressive Stop Ring PSR for steel fittings
The EO-Plus fitting produces high pressure, leak free connection of tubes and components in fluid systems. The basic function of EO-Plus is the controlled progressive bite of the PSR into the tube due to a unique internal geometry.
The front cutting edge A has already started cutting into the tube before the second cutting edge B begins. As soon as both cutting edges have cut into the tube to the designed depth further advance is limited by the stop shape C and the new overtightening protection D. Additionally, the special form of the PSR with its dimples at the front shoulder section gives an assembly state control.
Owing to the design of both cutting edges and stop shape all forces arising are equally distributed. This distribution along with the specially designed interior collar E of the ring guarantees increased safety, particularly with regard to vibration and flexure stresses. Service vibration loading is not present in the areas of the tubing where the bite is made.
The stop shape as well as the overtightening protection cause a clear sharp increase in tightening forces. After assembly, a visible collar F of cut tube material must completely fill the space in front of the first cutting edge. A slight bowing up of the ring G is desirable. This spring effect provides permanent compensation for flexural vibration and settling effects in the thread of the fitting nuts.
As a part of Parker Ermeto’s New Generation fittings, the Dry Technology EO-2 Plus Concept proven worldwide has
been further developed. EO2-Plus means maximum pressure
capability, as well as a new chromium6-free surface
with significantly higher corrosion resistance, and greatly
reduced tightening torques for larger sized fittings.
The common feature of all EO2-Plus fittings is elastomeric
seals on all joints. These are also now available in FKM
(e.g. Viton®) for applications with higher temperatures or
aggressive media. This assures leak free operation without
retightening – even under extreme working conditions.
The easy handling, time and cost saving features, and
many assembly advantages of the unique EO2-Plus functional
nuts have made EO2-Plus fittings increasingly popular.
EO2-Plus is designed for metric tube and based on German Standards DIN 3861 and DIN 2353, which today are represented by the international standard ISO 8434-1. EO2-Plus is available in “L”- and “S”-Series.
EO2-FORM is the new high pressure formed tube Generation of the Tube Fittings Division Europe. As with EO2-
Plus, it is designed in to eliminate leakage in all fluid systems,
by using elastomeric sealing systems.
The common feature of all EO2-FORM connections are the EO2 seal elements (Dry Technology) as well as the new cold forming process, that gives extreme rigidity and low tightening torques. The seals are now also available in FKM (e.g. Viton®) for applications with higher temperatures or aggressive media.
Through EO2-FORM, elastomeric sealing technology is made available even where bite-type connectors are not popular, like in hydraulic presses, cranes, lifts or ship canal locks. Compared to welding or brazing, the EO2-FORM process is faster and easier. It does not require special tube treatment, heating or chemicals.
EO2-FORM is designed for metric tube and fully interchangeable to the complete Ermeto Original product range according to ISO 8434-1 / DIN 2353. EO2-FORM is available in “L”- and “S”-Series.