Stem seals and packing systems in API 6A gate valves are equally important, preventing external leakage to atmosphere and supporting fugitive emissions control. Multi‑ring packing stacks made from elastomers and filled PTFE elements provide low friction and high sealing reliability around the stem, while back‑seating features allow isolation of stem packing for maintenance without ful... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/