Blowout preventer (BOP) hydraulic rams rely on high-integrity seals for ram-stem motion. Double Delta or T-seals handle annular pressures to 15,000 psi. HNBR variants resist rapid gas decompression (RGD). API 16A certifies for 500 cycles. Elastomers swell minimally in drilling muds. Rod wipers exclude debris, extending life. In deepwater, thermal barriers aid seals. Regular function t... https://globalsealstech.com/hydraulic-seals/