Lip Seal Stacks feature U-cup or T-seal profiles stacked for dynamic rod sealing in mud motors, where hydrodynamic lips trap lubricants while excluding abrasives. Energized by O-rings, they minimize drag under high RPMs. For HPHT, high-modulus jackets pair with low-durometer energizers, balancing friction and resilience. Designs per SAE AMS7277 ensure 1,000-hour endurance. Challenges ... https://globalsealstech.com/media/