The Submersible Column Pump is composed of a low-pressure gear type oil Pump, three high-pressure oil Pump components with oil Pump plungers, and an oil volume control valve.

How a Submersible Column Pump works.

The fuel pump will fuel from the tank pump, through a filter with oil and water respectively, through the oil into the pipe, and then into the high-pressure pump. The delivery pump passes the fuel through the saving hole of the pressure relief valve and then into the lubrication and cooling circuit of the high-pressure pump. The camshaft makes the plungers of the 3 pumps move up and down according to the shape of the cam.

The oil supply pressure exceeds the open pressure of the pressure relief valve. The oil delivery pump can make the fuel enter the plunger cavity through the intake valve of the high-pressure pump, and the plunger of the high-pressure pump is moving downward (oil suction stroke). In this way, the plunger cavity of the fuel may not leak, it will be higher than the pressure of the oil supply pressure compression.

The addition of oil pressure makes the oil valve open, reaching the common rail pressure, the compressed fuel into the high-pressure cycle (oil circuit). The plunger continues to supply fuel until it reaches TDC (supply stroke). After TDC, the pressure decreases, causing the outlet valve to close, and the fuel pressure still in the plunger chamber also decreases, and the plunger (pump plunger) moves down again.

As long as the pressure in the plunger cavity is lower than the pressure of the oil supply pump on it, the oil inlet valve and opens, the pumping process and starts.

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