BX ring gaskets are exclusive to API 6BX flanges for pressures up to 20,000 psi. Slightly larger than groove dimensions, they create radial interference for initial seal, with pressure energization boosting force as internal pressure rises. Each BX gasket includes a pressure-passage hole for equalization, preventing trapped fluid issues. Surface finish on 23° faces is ≤0.8 µm Ra. BX t... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/