API 6D ball valves for boil-off gas service handle -130°C temperatures. LNG seals use reinforced graphite primary sealing with Inconel mesh anti-extrusion rings. The design prevents graphite degradation during multiple thermal cycles. Valves incorporate molecular sieve filters in vent lines to prevent packing contamination. Seat pockets include 2 mm corrosion allowance per NORSOK M-50... https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/