Time-Tested PolyPakTM Sealing Systems
The time-tested and performance proven PolyPak™
Sealing System has been used worldwide to seal
critical energy, oil and gas exploration and production
applications. The most notable oilwell application is
the Blowout Preventer (BOP). Parker’s patented
PolyPak provides the positive sealing these critical
drilling applications require.
In addition to providing superior sealing in vacuum, low
and high pressure applications, the
PolyPak offers a number of distinct
advantages over conventional
symmetrical or non-symmetrical U-Packings:
- The PolyPak’s O-spring centers the seal in the gland.
The resulting high percentage of seal gland fill controls
rolling or twisting in the gland.
- At low or high pressure extremes, the O-spring
maintains lip loading on both I.D. and O.D. of the
- The PolyPak seal can be stretched or squeezed to
accommodate oversized cylinder bores and
undersized rods. As long as the seal cross section
is correct in relation to the radial groove dimensions,
the PolyPak will compensate and maintain proper
- The broad range of available PolyPak materials
ensures the proper combination of abrasion,
extrusion, temperature resistance and fluid
compatibility, which results in higher sealability and
longer seal life.