CGF Cartridge pressure valve high pressure accident with an overview of emergency in the turbine generator set, when the unit emergency stop, if the turbine governor failure, inability to shut off when the water flow guide vane servomotor speed hydro group it may rise to runaway speed. In order to limit the unit too fast to avoid runaway accident, set overspeed limiting device malfunction when the emergency shutdown turbine governor vane servomotor is an important measure to protect the safety of the crew. In particular, the turbine inlet valve is not set or rapid gate in hydropower turbine diversion system is particularly important over the speed limit setting device. Hydraulic power plant control and monitoring system malfunction or operation when the power disappeared, over-speed limiting device can directly receive mechanical valve hydraulic motor overspeed protection apparatus; CGF type overspeed limiting device to accept the power plant control system electrical control signals to operate control signal operation. Can reliably over-speed limit on the hydro group. CGF type overspeed limiting device uses two hydraulic cartridge valve integrated control block structure in the structure, designed by the hydraulic system, special electro-hydraulic valve, two-way cartridge valves and valve blocks to achieve the above functions. The hydraulic system components integrated in a valve block, installation, commissioning and maintenance is very convenient. Second, the technical parameters rated pressure: 16MPa nominal diameter: DN32 DN50 DN80 DN100 supply voltage: 220VDC 110VDC 220VAC pressure switch pressure setting range: 5 ~ 200bar pressure switch contact capacity: 0.2A / 250VDC 3A / AC220V Ambient temperature: 5 ~ 40 ℃ Relative humidity: ≤95% RH