Emergency shutdown capability requires LNG valve seals to function reliably during rapid valve closure under full differential pressure. Seals must withstand high-velocity flow conditions momentarily present during closure without damage from fluid forces, cavitation, or thermal transients that could compromise sealing effectiveness or cause catastrophic seal failure. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/