•  Elastic seal, which is energised by the deformation of the seal
   flanges towards the seal centreline. This deformation is governed
   by the groove and seal geometries.
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•  The seal will be pressure energised when subjected to pressure
   either from the inside or the outside.
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•  The HX seal works equally well both directions and is therefore
   the best choice when also large external pressures can occur
   (recommended for subsea use).
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•  A robust seal used in the most demanding applications.
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•  No practical limit for pressure that can be taken.