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A fuel dispenser is a machine that is used to pump gasoline,kerosene,petrol,diesel or other types of fuel into vehicles,accordingly,this kind of machine could be classified as Diesel Fuel Dispenser,Petrol Fuel Dispenser for example.
Fuel dispenser are also known as bowsers(in Australia),gas pumps(in Norh America),or petrol pumps(in Commonwealth countries.)
From the beginning of the 20th century,the fuel dispenser has experienced 4 stages:manually,mechanically,electronically and Computerized auto type.
A popular fuel dispenser is logically consisted of motor, pump, computer controller, flow meter, pulse sensor and automatic nozzle, etc.Especialy,when the accuracy is out of tolerance because of use time or working condition,the accuracy can be adjusted by change coefficient on flowmeter. While the dispenser cannot recover the normal accuracy, we can open the side covers of flow meter to check the piston(like a bowl) and distribution valve sruface.Also for some mini fuel dispenser,the computer coefficient can be adjusted through keyboard,too!
Typical fuel dispensers include several sections, such as hydraulic, metering, and hose/nozzle portions. The hydraulic section contains a rotary pump for drawing fuel from the storage tank and a solenoid/pilot valve to ensure that fuel flows only toward the dispenser and not back into the pump. Commercial dispensers such as those found at gas/petrol stations may house multiple units connected to different storage tanks for the purpose of supplying multiple fuels with different compositions or octane ratings.
An operational fuel dispenser contains a continuously running electric motor between the storage tank and the hydraulics portion of the unit for the purpose of maintaining a partial vacuum at the rotary pump inlet. When the nozzle opens, the storage tank draws suction pressure from the inlet, causing fuel to flow toward the pumping unit. An intermediary filter removes air bubbles or suspended solids from the fuel.
Fuel then flows through the pump and valve and into the metering unit. This portion includes mechanical gearboxes, as in older pumps, or piston meters and encoders to measure and distribute a specified amount of fuel or track fuel output. After the metering section, the fuel progresses through a flexible hose and into a nozzle that dispenses it into a vehicle or storage tank.
Fuel dispensers range from large commercial gas pumps to simple dispenser pumps for use with portable storage tanks.