Spring-loaded, non-elastomeric stem packing is a hallmark of API 6A Gate Valves, enabling gas-tight sealing and long-lasting reliability. This technology has passed API 6A PR2 performance validation tests, demonstrating excellent sealing even at 15,000 psi working pressure, assuring operators of safety under extreme well conditions.​ https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/