Filling station pumps in power under the action of high speed rotating, oil pipeline and pump cavity and air discharge, when the filling station pumps inside the pipeline and pump chamber is lower than atmospheric pressure, oil tank in the oil under the action of atmospheric pressure, pushed open the inlet pipeline of copper bottom valve in pipeline, the pipeline have tanker filter, after filters filter out impurities in oil, pure oil low pressure pump chamber into the oil and gas separator, low pressure oil pump, under the action of blade by low pressure oil into a high pressure oil, the oil outlet of high pressure chamber into the oil and gas separator. If the oil gun has not been opened or oil pipeline obstacles within the machine, the oil pump outlet pressure rising, when reach a certain pressure, petrol fuel pump the overflow valve open inside the oil pump, high pressure oil is entered into the low pressure cavity pump, relief valve in pump pump cavity circulation, reduce the oil pressure, protect the tankers in the pipeline and components;When the oil gun opened, pump oil outlet pressure suddenly drops, the overflow valve is closed, petrol fuel pump and high pressure chamber, filling station pumps high pressure oil gold soil in the high pressure chamber, oil
Fuel oil pumps in the upper gas floating in high pressure cavity, the upper part of the high pressure cavity exhaust valve into the atmospheric pressure cavity, gas exhaust pipes, oil after atmospheric pressure chamber of cone valve and parallel valve low pressure chamber into the oil and gas separator, recycling, high pressure oil with the high pressure cavity under the high pressure chamber of the oil outlet, pushed open the outlet valve into the meter, push meter run, flowmeter measurement after the oil discharge ceaselessly, the solenoid valve, depending on the oil, oil gun into the oil, fuel oil pumps gas metering, fuel oil machine after hanging guns, tanker motor, solenoid valve closed, oil and gas separator outlet valve, bottom valve under the reaction force of the oil closed, petrol fuel pump to prevent the hydraulic system and inside pipeline fuel oil pumps return back to the tank.