This invention relates to a Hybrid High Integrity Pressure Protection System (H-HIPPS) for severe services, the hybrid system includes a quick isolation subsystem between an overpressure zone and a normal pressure zone and a quick releasing subsystem between the overpressure zone and a lower pressure zone with quadruple redundancies for 30 year service without repair more particularly, the hybrid system has a novel valve and a novel pilot, each with two independent plugs with metal to metal seal—(buckling seal) B ring assemblies and a novel (attachable)) A seal ring assembly to block or release over pressurize fluids without actuators for protecting the pipelines or the pressures vessels from surge pressure at the highest level of a system reliability with a fast block off time, redundant sensing valves, redundant releasing methods, redundant pressure protections, and cavitations and erosion suppressor.