Page 130 - 4300 Catalog Cover.pdf

F6 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
EO and EO-2 Metric Bite Type Fittings
Catalog 4300
EO Progressive Ring Fittings
— Introduction
Theflarelessbite typefittingwaspioneeredbyErmeto inGermany
in the early 1930’s. When Parker Hannifin acquired Ermeto, it
introduced the EO fittings to the US. Today, the EO fittings are
the most widely used bite type fittings in the world.
The EO progressive ring fitting is a flareless metric fitting (for
metric tube)that consists of a body, a progressive ring (ferrule)
and a nut.On assembly, two cutting edges of the progressive ring
“bite” into the outer surface of the tube ensuring the necessary
holding power and seal for high operating pressures.
*The selection of LL, L or S design should be made by the user on the basis of intended system pressure. The pertinent maximum recommended
working pressures are shown throughout this catalog in individual data charts of the various fitting configurations.
the hardness, strength, and toughness necessary to satisfy the
demanding service conditions that exist in industry today. The
original progressive ring, known as DPR, is now being replaced
with the new generation, called PSR. PSR is stronger and fea-
tures a “positive stop” to eliminate over-tightening.
The EO Nut. EO fitting nuts are either cold formed, hot formed
or machined from cold drawn material. The cold forming and
cold drawing operations provide a more tightly packed grain
structure, thus improving the material’s strength. In addition,
cold forming significantly improves the fatigue properties or
endurance limits of the nuts.
Standard Material Specifications
Steel fittings:
EO tube fittings – Materials according to DIN 3859-1
Stainless steel fittings:
EO tube fittings – X6CrNIMoTi 17122 in accordance with
DIN 17440 / EN 10088, material no.
1.4571.
Brass fittings:
EO tube fittings – CUZN35Ni2 in accordance with DIN
17660, material no. 2.0540.
Elastomer seals: NBR (BUNA-N), FKM (Fluorocarbon)
Surface Finish - Steel fittings:
Standard
LL Series Body, Nuts, and Rings – Zinc clear chromate,
Chromium 6 Free
L+S Series Body and Nuts – Zinc clear chromate,
Chromium 6 Free
Progressive Rings (PSR) – Zinc clear chromate,
Chromium 6 Free
Short codes for surface protection procedure in accordance
with DIN 267 part 9 or DIN 50942.
How EO Fittings Work: Function
of Progressive Ring Fittings
The EO progressive ring fitting produces a low to high pressure,
leak free connection of tubes and components in fluid systems.
The basic function of the EO progressive ring is the controlled
progressive bite of the ring into the tube due to a unique internal
geometry.
The front cutting edge has already started cutting into the tube
before the second cutting edge starts. As soon as both cutting
edges have cut the tube to the designed depth further advance
is limited by the stop edge.
Owing to the design of both cutting edges and stop edge all
forces arising are equally distributed. This distribution along
with the specially designed interior collar of the ring guarantees
increased safety, particularly with regard to vibration and flexure
stresses.The design and function of the progressive cutting ring
ensure that service vibration loading is not present in the areas
of the tubing where the bite is made.
Fig. H1 — EO fitting components: Body, progressive ring
and nut
The fittings and components listed in this catalog are intended
solely for the assembly of connections for fluid applications.
Three series of EO tube fittings (LL, L and S) and accessories
are manufactured in accordance with DIN 2353 (summary)
which today is represented by international standard 8434-1
on the basis of decades of experience.*
To ensure functional safety of EO tube fittings, only EO parts
should be used in their assembly. Routing of tubes should be
carried out in accordance with Parker/EO recommended prac-
tices. Assembly instructions are available.
Design and Construction
The three components of EOfittings are designed andmanufac-
tured to produce a strong, reliable, leak-free joint upon proper
assembly.
The EO Body. EO fitting bodies are available in over thirty con-
figurations.The shapedproducts (i.e., elbows, tees, crosses) are
hot forged, then machined to the stringent EO fitting specifica-
tions. The forging process used by Parker further improves the
strength and metallurgical properties of the fitting material.
Straight products are made from cold drawn bar stock.The cold
drawing operation ensures consistently tight dimensional toler-
ances, as well as significantly improved strength.
The EO Progressive Ring (Cutting Ring). EO progressive
rings are precision machined with all dimensions and surfaces,
particularly the critical bite edges, monitored on an ongoing
basis.The rings are then heat treated in a manner that provides