Closed system multifunctional integrated valve group and emergency variable oil pump

The utility model discloses a closed system multifunctional integrated valve group and an emergency variable oil pump. The closed system multifunctional integrated valve group comprises an integrated valve block, and a valve block oil port A, a valve block oil port B, an output oil port and a valve block selection port are formed in the integrated valve block; after hydraulic oil of the valve block oil port A and the valve block oil port B is selected through the two one-way valves, pressure oil of a valve block selection port is formed, and the pressure oil of the valve block selection port provides a pressure oil source for a pressure reducing inlet in the pressure reducing valve. The closed system multifunctional integrated valve group in the emergency variable oil pump and the two-way variable oil pump are integrated into a whole, so that the space is saved, and the whole has a corresponding low-pressure small-flow external branch function and an emergency oil port external connection function. 一种闭式系统多功能集