Page 21 - Catalog4400.pdf

When specifying hose, there are
two temperatures you need to
identify. One is the ambient
temperature, which is the
temperature that exists outside
the hose where it is being used; the
other is the media temperature,
which is the temperature of the
media conveyed through the hose.
Very high or low ambient tempera-
tures can have adverse affects on
the hose cover and reinforcement
materials, resulting in reduced
service life.
Media temperatures can have a
much greater impact on hose life.
For example, rubber loses fexibility
if operated at high temperatures for
extended periods.
Parker hoses carry different
temperature ratings for different
fuids. For example, 811HT hose
has a temperature range of -40°F
to + 257°F (-40°C to +125°C) for
petroleum-based hydraulic fuids.
However for water, water/glycol,
and water/oil emulsion hydraulic
fuids, the range drops to a rating of
up to +185°F (+ 85°C). Air is rated
even lower at up to 158°F (+ 70°C).
Some media can increase or
decrease the effects of temperature
on the hose. The maximum rated
temperature of a hose is specifc
to the media. See the Minimum/
Maximum Temperature Chartin
Section Efor a full listing of all
temperature ratings.
Temperature
Parker offers a wide range of
special types of hoses for low and
high temperatures. See pages
A-6toA-7Hose Overview.
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