Lip-seal style LNG stem seals combine dual PTFE U-cups with Inconel garter springs for bidirectional cryogenic sealing. These low-friction designs reduce operating torque by 60% compared to traditional packing while maintaining Class A fugitive emission performance throughout the full -196°C to +150°C temperature envelope. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/