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Seals are an important part of hydraulic devices.They prevent leakage of oil and contamination by water and foreign matter. Types of seals include o-rings, oil seals, gaskets and packing. |
| 1 Packing |
|---|
|
Packing prevents oil
form leaking out or foreign matter from coming in through small openings
that occur as a result of heat expansion or small manufacturing inaccuracies
in parts that move against each other.
|
| Types of Packing |
 Packing
composed of cotton cloth or asbestos cloth with rubber added |
| Packing
composed of synthetic rubber or leather |
| Section Shape |
| U
shaped, V shaped and L shaped |
|
|
| 2 O-Rings |
 These are pieces of synthetic rubber in a ring shape. O-rings with a round section are widely used. They are used in fixed and sliding parts. |
Seal [packing]
Type |
Shape |
Features / Uses |
U-Shaped Packing |
|
1) Used in internal and external sliding surfaces |
V-Shaped Packing |
 |
1) Used in internal and external sliding surfaces 2) Used for low and high pressure (Depending on pressure, several are applied together.) 3) High resistance to sliding motion |
L-Shaped Packing |
 |
1) Used in external sliding surfaces 2) Used for low pressure 3) Low resistance to sliding motion |
O-ring |
 |
1) Used in internal and external sliding surfaces 2) Used for low and high pressure 3) Low resistance to sliding motion |
| 3 Gaskets |
|---|
 Gaskets are seals shaped like flat sheets. They are inserted into the gaps between non-moving parts to maintain air-tightness. They are often used in pipe joints. They can be made of asbestos, synthetic rubber, metal,etc. |
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