Hydraulically operated, diaphragm driven, off-line surge prediction valve opens immediately when the pump suddenly stops. Pre-opening valve dissipates the return of high pressure wave; To eliminate the surge. The valve should be closed smoothly as soon as the pressure relief function allows. To prevent closing surge. The valve can also release excess system pressure. The Bermad 700 series valves are hydraulic, pilot, inclined and globe valves with seat assembly and double chamber combination actuators that can be removed from the body as a single integral unit. The hydrodynamic body of the valve is designed for unimpeded flow paths and provides excellent and efficient regulation for high pressure differential applications. The 700 series operates under harsh operating conditions with low cavitation and noise. They are made of high quality materials and are suitable for different mining applications.