Helical spring-energized seals use Inconel X-750 or 316L springs for maximum corrosion resistance in marine LNG environments. They deliver consistent load over 20-year design life and survive 10,000+ cycles at cryogenic temperatures in high-cycle ship-to-shore loading valves. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/