|
No.
|
Hydraulic
System
|
Pneumatic
System
|
|
1
|
Working fluid is hydraulic oil.
|
Working fluid is compressed air.
|
|
2
|
As oil is incompressible, oil can be pressurized to very high
pressure. (500 bar or even more)
|
Air is compressible; hence air can be pressurized to lesser presser. (Only
up to 10 bar approx.)
|
|
3
|
Due to high pressure develop high force I thousands of tons.
|
Due to low pressure develop very low force up to 1ton.
|
|
4
|
Since pressure is high, components are very strong, made of steel and
they are heavy.
|
Components of pneumatic system are lighter in weight and they are
made from aluminium.
|
|
5
|
As oil has more viscosity, it cannot flow fast. Hence hydraulic
system are slower in operation.
|
Air is very less viscosity, It can be flow very fast. Hence pneumatic
system are quicker in operation.
|
|
6
|
Due to continuous recirculation, temperature of oil increase.
|
Harder it runs, cooler it works. Free expansion of air in cylinder
and motor causes chilling effects.
|
|
7
|
Leakage of oil result in dirty and slippery surrounding may leads to
accidents
|
Very clean and dry surrounding is maintained.
|
|
8
|
There is no need of separate lubrication system, because hydraulic
oil itself is a lubricant.
|
Lubricator is necessary. Oil is mixed with the compressed air in
lubricator and then supplied to system.
|
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