 A
hydraulic hose consists of an inner tube through which the fluid
is conveyed and comes into direct contact with the hydraulic fluid.
The rubber or other synthetic material used for this needs to be
compatible and able to withstand the range of working temperature
without losing its chemical and physical stability.
The
hydraulic hoses can be made using a variety of materials, depending
on the factors of oil compatibility, abrasion resistance etc. These
include:
Plastic
- The plastic materials comprise of: Nylon, Braided nylon hose ,
Polyvinyl chloride, Textile braided hoses, Thermoplasts, Teflon,
Chloro sulfonated polyethylene (Hypalon), Ethylene propylene
diene (EPDM), Chlorinated polyethylene etc.
Homogeneous
Synthetic Rubber - This category includes hose materials
like: Buna N, Neoprene, Natural rubber, Butyl etc.
The
hydraulic hose is an important element in the system that needs
to be checked for its reliability and durability during the manufacture
process. In many hydraulic systems, it is necessary to move the
drive unit along with the oil lines. Here, synthetic-rubber is suited
as the material for the hydraulic hoses. Plastic tubings are also
used in hydraulic systems to convey the fluid.
Important Points
The
hydraulic hoses need frequent maintenance that facilitates smooth
working thereby increasing their service life. Some important considerations
are:
-
The excessive taut in the connected hose should be avoided while
connecting two elements through a hose.
- When
pressure is applied to hose, the hose tends to bulge and decrease
in length. Thus slackness needs to be permitted to avoid strain
to the hose.
-
They should not be installed with a twisting as it may weaken
the hose structurally and cause loosening of the fittings.
- High
temperature may damage the hose cover and may shorten its useful
life. Hence under hot working conditions, the hoses should be
protected through proper heat insulation by using heat resistant
hose material.
- The
hose run should be such that rubbing and abrasion with the metal
members of the system are avoided. Clamps and hose guards are
often used to group the hoses and keep them away from the moving
parts.
-
The hose manufacturer's guidance and specific instructions need
to be taken care of with regard to bend radius, environment and
oil' compatibility, pressure capability, etc.
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