Electric Actuating Mechanism Pump-The electric actuating mechanism is connected to the amount-adjusting screw rod of the metering pump, changes the stroke length through receiving the input 4-20mA signal and changing the rotation turns, outputs a group of 4-20mA feedback signals, forms closed-loop control, and finally adjusts the output flow of metering pump to realize long-distance or automatic flow adjustment and automation. The travel distance percentage and running state can be displayed on the LCD display screen.