Spring-energized seats are essential for low-pressure sealing in high-rated valves. Belleville springs or coil springs maintain constant force (200–500 lbf) against the gate below 500 psi line pressure. As pressure rises, fluid force supplements spring load, creating a self-energizing seal. This hybrid mechanism ensures API 6A PR1 performance across full pressure range. Inconel spring... https://globalsealstech.com/