Extended bonnet length follows ASME B16.34 guidelines with minimum 100 mm drip plate distance. This keeps stem packing above -50°C during LNG flow, preventing frost damage. Live-loaded graphite or PTFE packing systems maintain compression and compensate for thermal contraction cycles. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/