HPHT API 6A Gate Valve Seals use Inconel 725 springs and PEEK90 Vee rings for 30,000 PSI/700°F extremes. Carbon fiber backups resist extrusion at 10% strain. Seals endure 100 thermal cycles from 100°F to 650°F without set. NACE MR0175/ISO 15156 Level VII sour compliance. Diamond-like carbon (DLC) coatings lower friction coefficient to 0.1. Proof rings measure seat compression in-situ.... https://globalsealstech.com/