An elastomeric high pressure seal is typically
designed to operate within ambient pressure to about 1,500 psi. At a very high
pressure, the seal must have sufficient strength to resist extrusion into the
clearance gap. The chart below illustrates the recommended limits of the
combination of clearance gap (diametral), seal hardness, and pressure
Techniques to avoid extrusion in a high pressure
seal include decreasing the clearance gap, increasing the elastomer modulus (Mod
100) and the use of backup rings. Backup rings can be made of many rigid
polymeric materials and are used on the low-pressure side within the gland to
help prevent extrusion. Standard size backup rings are available for a high
pressure seal in many materials.
Changes in Pressure/Vacuum
Cycling pressure can cause the high pressure seal
to move back and forth within the gland. This can be especially damaging to a
seal with poor dynamic properties or in applications with low compression, which
will allow for more motion.
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