Catastrophic seat seal failure from mechanical damage, thermal shock, or material degradation could allow sudden massive flow through a failed isolation valve, potentially causing downstream equipment overpressure, cryogenic exposure of components not designed for cold service, and rapid release of large LNG quantities if downstream piping fails under unexpected loading conditions, cr... https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/