Failure modes for LNG valve seals include wear from repeated cycling, thermal fatigue from temperature cycling, compression set from prolonged sealing stress, and brittle fracture if materials lose ductility at cryogenic temperatures. Understanding failure mechanisms guides material selection, design optimization, and maintenance scheduling preventing unexpected failures. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/