Low-torque seat designs use PTFE-based composites with MoS2 or graphite fillers. Operating torque stays below 70% of API 6A maximum even after 500 mechanical cycles and multiple thermal shocks, critical for large-bore actuated gate valves. ( https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/