Torque and thrust calculations for stem movement in API 6A gate valves include friction from seal contact as a major component. Low‑friction packing and seat seal materials, combined with surface finishes on stem and gate, help control required operating forces. This optimization prevents overstressing actuators and reduces the risk of partial closure that can damage seal faces. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/