Low Temperature LNG Valve Seal

A spring-loaded seal will benefit from the low-friction properties of the gland material, and the force exerted by its spring will help prevent shrinkage of the plastic ring. The same force ensures that the plastic ring maintains a tight conformity even at the lowest temperatures, preventing any irregularities or tolerance changes in the hardware. Elastomeric seals or packings do not provide the same benefits because they are prone to uneven wear and compression set. Metal seals are a poor choice for dynamic service because metal-to-metal friction is ineffective at sealing.

One of the emerging areas of research in cryogenic valve sealing is hybrid sealing, a technology that will leverage the most desirable physical properties of two common actuators to overcome the unique challenges of sealing at cryogenic temperatures. Increasing the excitation force in traditional seals can effectively reduce leakage, but only to a certain extent. In low temperature environments, considerable force is usually required, and too much force will have negative effects. Hybrid actuators currently under development allow the seal to exert extremely high forces on the sealing lip, resulting in a tighter seal with high heat and high fractional surface loading without damaging the sealing lip. The seals maintain contact under high pressure and low temperature conditions, counteracting the effects of shrinkage and hardware changes.

Preliminary testing of the hybrid seal shows it is an improvement over traditional cryogenic sealing solutions, with the seal consistently exceeding industry standards.

For more information, please send contact KAFLON.

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