Page 19 - Parker Catalog 4400 - Hose, Fittings and Equipment

Temperature

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

Application

Before selecting a hose, it is handled by our family of abrasion- • SAE (Society of Automotive
important to consider how the hose resistant hose with both Tough Engineers)
assembly will be used. Answering and Super Tough covers. • EN (European Norm)
the following questions may help: • DIN (Deutsches Institut für
When application space is tight, Normung)
• What type of equipment bend radius is another important
is involved? • ISO (International Organization
• What are the environmental consideration. Parker offers a full for Standardization)
line of hoses designed for one-half
factors?
• Are mechanical loads SAE bend radius at full SAE-rated
pressures. We offer hoses with
applied to the assembly?
• Will the routing be confined? increased flexibility and smaller
outer diameters enabling faster,
• What about hose fittings – easier routing in small spaces,
permanent or field reducing both hose length
attachable?
• Will the assembly be and inventory requirements. Governmental agencies control
subjected to abrasion? additional standards for particular
Industry standards set specific industries such as U.S.C.G. and
requirements concerning ABS. You must select a hose that
Sometimes specific applications construction type, size, tolerances,
require specific hoses. For burst pressure, and impulse cycles meets the legal requirements as well
example, applications where of hoses. Parker hydraulic hoses as the functional requirements of the
hoses will encounter rubbing or meet or exceed standards such as: application.
abrasive surfaces, would be best

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