Bi-directional sealing capability allows LNG valves to seal against pressure from either flow direction, essential for pipeline applications where flow reversal may occur. Seal designs must provide effective sealing regardless of pressure direction, utilizing balanced geometries or dual sealing elements ensuring reliable performance independent of flow conditions. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/