Fuel dispensers are machines used for pumping gas, diesel, biofuels, and most other types of fuels into vehicles. The modern fuel dispenser has two main parts. The first is the electronic head, into which is embedded a computer which controls the pump’s action, drives its displays, and communicates data to a remote sales system. The second is a mechanical section containing a pumping unit, electric motor, pulsers, valves, and meters to pump and control fuel flow.
Submersible pumps are those in which the fuel pump is immersed and sealed within the fuel tank. This kind of dispenser is used in hot countries where the suction pump could have a problem surmounting cavitation with warm gasoline, or when the tank-to-pump distance is too long for a suction pump to manage.
Modern pumps have different types of hoses, grades of dispensing, physical shapes, and extra dispenser devices, including tag readers and pay-at-the-pump devices. Nozzles attached to flexible hoses allow the dispenser to service the filling inlet of a vehicle. Hoses are robust in construction, in order that they may survive heavy use, including weather exposure and getting driven over by large vehicles. They are usually equipped with heavy coil or spring arrangements for added strength. The dispenser also has a breakaway valve to stop the fuel from flowing should its nozzle and hose break off, due to the fact that absent-minded drivers and attendants sometimes let the vehicle drive off while the nozzle is still inside the filling inlet. Nevertheless, systems today prevent payment for the fuel to commence if the nozzle is not yet replaced into the pump holder, thus preventing such accidents.
Added features of nozzles include different sizes and diameters that generally prevent incompatible fuel from being filled into the wrong vehicle, such as diesel being pumped into a vehicle intended for gasoline.
Some countries have pumps that can mix two different petroleum products before being dispensed. Typical usage of this includes adding oil to gasoline in 2-stroke motorcycles.
The flow rate for a typical fuel dispenser is about 40 liters per minute. The rate is higher in high speed pumps that serve large vehicles such as trucks. Among the most critical functions of a fuel dispenser is the accuracy of the amount of fuel it pumps. Measurement of flow is usually performed by a four-stroke piston meter that is attached to an electronic encoding device. Older gas pumps has mechanical meters that physically reel numerical displays, while newer models measure the movement of the meter by electrical pulses through the use of a rotary encoder.
Modern fuel dispensers also have an auto cut-off valve, which stops the fuel flow once the gas tank is full. A sensing tube which runs inside the nozzle’s mouth up to the pump handle makes this possible. The pump handle’s mechanical valve detects the pressure change and closes automatically.
Industry leader Enrique Freyre provides high quality fuel dispensers at the right price, with an excellent after-sales service. Inquire and ask for a price quote from Enrique Freyre for all your fuel equipment needs, and you will surely thank yourself for it.