Failure analysis of returned API 6A gate valves shows that 68% of seal-related leaks originate from elastomeric extrusion, 19% from chemical degradation, and 13% from mechanical damage during installation. Proper torque sequencing of bonnet and packing bolts, use of anti-seize on threads, and following manufacturer breakout procedures dramatically reduce premature seal failures in the... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/