bellows controls the flow of fluid into the bellows in this way the bellows can be charged by filling the bellows with pressurized air through the fill valve as the bellows are filled with pressurized air the bellows expand outwardly displacing the valve element 72 downwardly the bellows 80 compresses in response to hydrostatic pressure on the bellows when the pump is in the liquid in the well as the bellows compresses the valve 70 closes the stroke of the valve element 72 between the opened position and the closed position corresponds to the compression of the bellows from the charged length to the compressed length when the valve 70 is closed referring to fig1 an upper discharge line 19 and lower discharge line 21 are connected to the well 5 for receiving the fluid from the well the upper discharge line 19 extends between the well 5 and the lower discharge line 21 preferably the lower discharge line 21 is approximately twice as large in diameter as the upper discharge line 19 the opening from the well 5 to the upper discharge line 19 is vertically spaced along the well from the opening to the lower discharge line 21 a distance that is greater than the distance.