Slab gate and disk seat combination is widely used in API 6A valves for full-bore, through-conduit flow, allowing minimal pressure loss and reliable sealing. This design lends itself to extended service intervals by reducing wear and damage to sealing surfaces, a crucial aspect for wellhead and manifold service conditions.​ https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/