Nozzle dispenser works: open the oil gun, high pressure oil to open the main valve, through the gun body and flowline flows into the container, at the same time, high speed negative pressure generated by the liquid through the umbrella main valve air flow, gas nozzles air flow through the diaphragm on the vacuum chamber, safe and cut off the top of the hole, the same period by the flowline independent pipe to keep balance of pressures.Oil gun to work normally.If the fuel nozzle manufacturers is full to the nozzle block vent, make nozzle dispenser vacuum negative pressure gas nozzles is pulled upward displacement of the diaphragm, rafah device under the action of spring force out of balance, close the main valve, self-styled process fuel nozzle manufacturers is complete.