TPi May 2014

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40 Tube Products International May 2014
products & developments
Push-in fittings for harsh environments
LIQUIDLine and INOXLine push-
in fittings are designed for industrial
applications requiring the connection
and distribution of cooling water,
compressed air, gases and liquids. In
the search for a solution for especially
harsh production environments and
higher temperatures, Eisele decided on
a high-quality fixed pipe connection
that combines all the advantages of the
Eisele modular system.
For cooling water applications or
especially demanding and corrosive
industrial applications, Eisele
recommends the combination of
LIQUIDLine or INOXLine push-in fittings
with highly resistant ProWeld hoses.
This combination is suitable for use in
extreme conditions and at temperatures
up to 100°C, but even this solution
approaches its limits in the case of
increased abrasion and wear from weld
spatter, aggressive cleaning agents,
extreme heat, soiling or mechanical
stress.
Such conditions exist, for example, in
foundries, the semiconductor industry
or automobile manufacturing. At
temperatures above 100°C the bursting
pressure of hoses declines. The
advantage of pipes is that their pressure
resistance is virtually constant.
Standard systems from Eisele are
suitable for combination with pipes.
Customers can therefore use pipes at
temperatures up to 120°C, with the
flexibility and convenience of push-in
fittings. For stronger thermal loads,
Eisele fittings can be equipped with
seals that are designed for higher
temperatures. Metal pipes can be used
wherever a flexible connection is not
needed. At high temperatures and
unfavourable ambient conditions, a pipe
connection is even more economical
than a hose connection in the long run.
Eisele delivers push-in fittings with
diameters from 4 to 20mm, which also
makes the concept suitable for the
main air supply in machine construction.
This type of compressed air connection
requires little maintenance and offers
a long service life. The optimised
fitting geometry ensures high flow
rates. Depending on the particular
application, different seal materials
such as FPM, EPDM or NBR can
be used. The advantage of push-in
fittings over compression ring fittings
is that they allow faster connecting and
disconnecting.
Eisele offers the option of using
pipes instead of hoses especially
for the LIQUIDLine fittings made of
dezincification-resistant brass and
INOXLine fittings made of stainless
steel. The application parameters are
based on the respective product series.
Series 17 and 26 with a seal on the
push-in fitting can withstand pressures
up to 16 bar, while series 17a and
24 with a double O-ring seal achieve
an even better leak-proof seal, making
them suitable for higher pressures.
All fittings are designed for temperatures
from -20 to +120°C. For more extreme
conditions, they can be equipped with
other seals, on request. Dezincification-
resistant brass is suitable for water and
cooling water. Stainless steel V2A and
V4A is resistant to cleaners, acids and
caustic solutions.
Eisele Pneumatics GmbH & Co KG –
Germany
The use of a fixed pipe
connection in combination
with push-in fittings offers
advantages in harsh
operating conditions