A system includes a pressure exchanger configured to exchange pressure between a first fluid and a second fluid. The system further includes one or more first valves coupled to the pressure exchanger. The one or more first valves in an open position are associated with a flushing operation.

A fan gearbox oil replacement device and a method for using the same; the fan gearbox oil replacement device in includes a moving box body, a reversing mechanism, a filtering mechanism and an oil storage mechanism are arranged in the moving box body; the reversing mechanism is provided with an oil inlet and an oil outlet which are opened or closed at different time; the filtering mechanism comprises a filtering tank and a sedimentation tank, the filtering tank is located below the oil outlet, and the sedimentation tank is located below the filtering tank; the sedimentation tank is connected to the oil storage mechanism and is communicated with the interior of the filtering tank; the oil storage mechanism is communicated with the oil inlet; the sedimentation tank and the oil storage tank of the present invention can be easily pushed into or pushed out from the moving box body.

A fan gearbox oil replacement device and a method for using the same; the fan gearbox oil replacement device in includes a moving box body, a reversing mechanism, a filtering mechanism and an oil storage mechanism are arranged in the moving box body; the reversing mechanism is provided with an oil inlet and an oil outlet which are opened or closed at different time; the filtering mechanism comprises a filtering tank and a sedimentation tank, the filtering tank is located below the oil outlet, and the sedimentation tank is located below the filtering tank; the sedimentation tank is connected to the oil storage mechanism and is communicated with the interior of the filtering tank; the oil storage mechanism is communicated with the oil inlet; the sedimentation tank and the oil storage tank of the present invention can be easily pushed into or pushed out from the moving box body.