API 6D ball valves in LNG custody transfer systems feature metrology-grade accuracy. Seals maintain tightness during high-flow calibration. The valve’s low-turbulence design preserves measurement precision. LNG seals use non-contaminating materials to protect flow meters. Testing per API 6D includes endurance at maximum flow rates. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/