| Selection
of a Seal : -
The selection criteria are generally the requirements, which
have to be met by a seal.
 It
must achieve the required degree of tightness.
Be
made from a material with adequate elasticity and dimensional
stability to compensate for variations of
the cylinder inner diameter.
Be
resistance to extrusion, even a large gap at high pressure.
Must
have good compatibility with the media throughout the working temperature
range. A low swell is necessary.
Must
have a good sliding feature (low friction), high abrasion resistance and
be easy to install and replace.
The
material should not wear and allow particles to enter the system.
In addition to these, there are other operating conditions,
which affect our analysis.
Some of these are as follows : -
The
system pressure. The seal must be able to operate at high pressures and
still be tight at low pressures.
The
stress imposed by the variations of the pressure when working.
The
location of the equipment, outdoor or indoor.
The
working temperature range.
The
installation conditions.
The
length of stroke and frequency.
The
speed of movement.
The
expected friction, like stick slip behavior.
The
operating and stationary periods.
Type
and characteristic of seal materials.
The
media specification and compatibility with the material
These conditions have an effect on the performance of the seal
service life, leakage, friction, wear and reliability. These
are important and influence the selection of the optimum seal
shape and material.
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Seals