E8
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
EO and EO-2 Metric Bite Type Fittings
Catalog 4300
Fitting Instructions:
The life of a rotary fitting depends considerably in a stress-free
lineconnection.Therefore, thedirect connectionwith tube is tobe
avoided. For connection to hoses, the use of swivel nut fittings is
recommended with short, straight lines (approx. length 5x hose
O.D.). Thus, shocks and vibrations can be absorbed.
Non-Return Valves
Characteristics:
Sealing is achieved by using a 90° cone with a
packing washer of synthetic material.Valve has a lift stop which
provides safe free outlet, shock-absorbing, muffled opening
and no reduction of cross section. Maximum flow velocity not
more than 8 m/sec (for higher flow velocities special tests are
required).
Opening Pressure:
Approximately 1 bar standard (on request
also 0.2, 0.5, 2, 3, 4, 5 & 6 bar are available). Please specify
nonstandard opening pressures on order as follows:Tube Fitting
part number, opening pressure, material.Ex:RHD12L2BCF is a
RHD12LCFwith 2 bar opening pressure.Tolerance of (cracking)
pressure is ±20%.
Tube Recommendations
For steel fittings:
Seamless cold drawn steel tubes made from material St. 35.4
or from conditioned base material St. 37.4 in accordance with
DIN 1630, state of delivery NBK (normal annealed) with tube
outer and inner diameter tolerances in accordance with DIN
2391/
ISO 3304. Max. hardness: HRB 75.
For stainless steel fittings:
Material no. 1.4571 and 1.4541
Seamless drawn tubes made from austenitic, stainless steel
materials no. 1.4571 and 1.4541, in accordance with DIN/EN/
ISO 1127. Max. hardness: HRB 90.
These tubes are particularly recommended for tube fittings,
since the tube outer diameter and wall thickness, tolerances
correspond to those of steel tubes in accordance with DIN
2391/
ISO 3304.
For brass fittings:
Seamless drawn copper tube made from material with short
code SF-Cu F37 in accordance with DIN 1786.
Tube wall thicknesses:
In order to determine the necesary tube wall thicknesses for
applications, refer to the calculated pressures provided in the
tables for EOmetric tubing.The calculated pressuresDIN2413-I
are for static and DIN 2413-III for dynamic loads.
The maximum wall thickness is based on the pressure holding
capacity of the fitting. In some cases, the wall thickness of the
tube might be too thin for reliable service and an insert must be
used to prevent excessive tube collapse. See assembly section
for recommended tube wall thicknesses.
Plastic tube:
EO fittings are suitable for use with various types of plastic tubes
such as nylon, polyethylene, etc. When used with plastic tube,
an insert
(see page E15)
must be used to prevent tube pull out
due to tensile loading.
Features, Advantages &
Benefits
•
Visible Bite —
The critical front bite of the progressive ring
is clearly visible to tube fitters & inspectors. The presence
of the recommended bite virtually eliminates any risk of
catastrophic blow-off.This is a very important safety feature.
•
Sealing Capability —
EO fittings have demonstrated a
remarkable ability to remain leak free under various service
conditions ranging from sealing high vacuum and small
molecules gases to high pressure hydraulic fluids.
•
Distributed Stresses —
Stresses due to service flexural
loading are distributed at several points in the joint, thus
stress concentration in the bite is minimized.
•
Vibration Control —
The rear bevel of the ferrule firmly
grips tubing, thus dampening the effects of systemvibration
in the joint.
•
Progressive Ring Design —
The progressive ring design
provides a second bite for improved reliability and higher
working pressure capability.This design also decreases the
risk of improper assembly because of the sharp, high torque
rise which occurs when the fitting is properly tightened.
•
Envelope Size —
EO fittings are relatively small and com-
pact, making it a suitable selection for plumbing in limited
or tight space.
•
Temperature Rating —
EO fittings are suitable for sub-
zero through elevated temperature applications. Service
temperature rating is limited by the material chosen.
•
Compatibility —
Since EO fittings can be manufactured
fromawide range of metals, its compatibility factor with vari-
ous fluids and atmospheric conditions is virtually limitless.
One simply has to select and specify EO fittings from an
acceptablematerial that best satisfies theserviceconditions.
•
TubeWall —
EO fittings are suitable for use with light wall,
mediumwall, heavy wall, and extra heavy wall tubing.(Light
wall tube may require support sleeve (VH), as shown in
Assembly/Installation Section.
)
•
Re-Usability / Remakeability —
Joints can be disas-
sembled and reassembled many times to facilitate system
maintenance.This reduces the labor andmaterial costs that
would otherwise result from tube and fittings replacement.
•
Assembly —
No expensive, complicated tooling is neces-
sary to assemble EO fittings. Assembly is simple when the
procedures described in the Assembly / Installation section
are followed
(see pages S28
- S33).
•
Materials —
EO fittings can be manufactured from almost
any metallic material.The more popular materials currently
used for EO fittings are: stainless steel, carbon steel, and
brass.On request, theTube FittingDivisionwill machine EO
fittings from other appropriate material specified by users.
•
Manufacture —
EO fittings are manufactured under tight
quality control which ensures that the product routinely
satisfies or surpasses the requirements of the pertinent
industrial standards.
•
World Wide Popularity —
The bite type fitting design
has worldwide acceptance and is especially popular in
Europe.
•
Superior Plating:
Superior plating gives Parker steel tube
fittings unmatched protection against red rust. In neutral
salt spray test per ASTM B117, Parker EO and EO2 fittings
substantially exceeded the SAE requirement of 96 hours
to red rest.
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