Valve seat rings in API 6A Gate Valves are often fixed by plates, adding mechanical stability and improving anti-corrosive performance. Hard alloy coatings or stainless steel overlays are used on gate and seat surfaces to resist wear and enhance seal longevity, lowering lifetime operating costs for asset owners.​ https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/