Sound Seal: On Rotary Shaft Seals
Sealing
an assembly is a simple enough task; you just find an appropriate
cover to conceal whatever part needs protection, and voila. However,
some assemblies will need special types of seals that satisfy very
particular criteria. Shafts, for instance, might need seals if the
rods are attached to another assembly that involves the use of
pressurized liquid.
Adding
seals
to a rod, especially one that moves around, is a very critical
procedure since the seals need to withstand a significant amount of
stress. The seals should also be able to hold firmly even when the
shaft spins at high speeds. Likewise, the seals will need to
compensate for any deformities the shaft may experience due to
constant use, such as lip wear or the deformity of the seal's
elastomer material.
Consequently,
the rotary shaft seal was created to meet these strict parameters.
Often made from a tough-wearing elastomer such as Teflon, these
heat-resistant seals can be used to link shafts to moving assemblies.
Inside these seals, you’ll find a coiled garter spring that helps
secure the seal over the shaft and helps it grip the rod regardless
of any deformities present. Rotary shaft seals can be also be found
on power steering assemblies, hydraulic pump devices, and valve
stems, among many other applications.
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