Basic working principle and configuration of fuel dispenser

Published:2012-11-10 10:03:12

Basic working principle and configuration of fuel dispenser


  1. Basic working principle.

    The basic working principle of fuel dispenser can be illustrated by the following chart 1-19, the line with arrow presenting flow direction of oil, line denoting the transmission direction of mechanical or electric sign.

 Working process of fuel dispenser

Diagram 1- 19: Working process of fuel dispenser

    Fuel is sucked from underground tank, enter measurement transducer via vapor separator, and flow out nozzle through solenoid valve. The position movement value of axis generated by transducer is converted into relevant electric pulse sign by sensor, the indicator of electric counter display accumulative volume refueled. If in mechanical fuel dispenser, the volume refueled can be presented by the indicator device of mechanical counter by measuring the position movement of output axis of converter. The pump of submersible fuel dispenser is installed in oil in tank, which can delivery fuel to several measurement transducers, and flow out nozzle. Its counter device is similar to pump built-in fuel dispenser.

    The current fuel dispenser is operated simply, putting down nozzle to start system, and nozzle automatically closed when tank is full. Other operation can be conducted on the operating keyboard, such as presetting, starting, close, inquiry and various denotations.

  1. Main components and functions

    2.1  Main components

   A fuel dispenser composed of pump, oil-air separator, flow meter (measurement transducer and counter display part), nozzle, electric system (control, transmission, operation, and display system), electric section, pipeline, oil indicator, bracket, covering, etc.

    Need to special explanation that fuel dispenser is a kind of delivery equipment used in flammable and combustible circumstance, thus, the electric and electrical components and their connection should be manufactured and certificated in conformance with the national explosion-proof standards so as to ensure the product security.

    In addition,Chinahad stipulated that from February, 1990 that the commercial fuel dispenser should have the function of tax-supervision, in accordance with the national taxation requirement so as to safeguard the reliability and security of taxation data.

    The key components and main principle of fuel dispenser as followed:

Major components and working flow of fuel dispenser 

1-Motor 2-Pump 3-Vappor separator 4-Measurement transducer 5-Sensor 6-Mechanicle/electronic counter device 7-Oil indicator 8-Nozzle

Diagram 1- 20: Major components and working flow of fuel dispenser

    2.2 Main components functions

    When the fuel dispenser’s starting component work (e.g. take off nozzle or push starting button) motor is operated and drive pump. The oil is sucked into pump chamber from underground tank, being be pressured in pump body, and flow into oil-air separator in where air was segregated from oil. The air-free oil flow into measurement transducer and impel the calculating piston move, the position movement of output axis sign corresponding to fuel filled was transmitted and converted into electric pulse sign through sensor. The pulse sign transmit to electrical counter device that record and display the volume of present and total filing (either volume or sale). Finally, the oil was measured and flowed out of nozzle via solenoid valve and oil indicator.

    The operator conducts the starting, close and control flow-rate; oil indicator is device used for air and foam check through eyes. Solenoid valve is mounted for preventing in presetting fuel from affecting accuracy due to the inertial of fuel.

    Fuel dispenser with submersible pump to delivery oil together, its motor and pump is operated by the nozzle or starting key. Submersible pump delivers pressured oil to many fuel dispensers, in this kind of fuel dispenser delivered through positive pressure dot need to install built-in oil – air separator, pump and motor, but the rest of components is similar to suction pump fuel dispenser.

    2.3   Fuel dispenser’s design, manufacture, appraisal standard and certification

    Fuel dispenser belongs to one kind of legislative commercial measurements, which should be compulsorily appraised and managed through technology supervision departments at state and all levels.

    The design, manufacture and appraisal of fuel dispenser is in accordance with the relevant national provisions, standard and regulations, namely, National Standard GB/T9081-2001 Fuel Dispenser for Vehicle; National Standard GB3836-2000 electric Apparatus for explosion gas atmosphere; procedure of measurement appraisal for fuel dispenser JJG443-1998; Measurement technology regulations JJF1060-1999 Appraisal outline of tax-supervision fuel dispenser.

    Appraised fuel dispenser should obtain the manufacture licensing for measurement instrument issued by the state quality inspection administration; whole frame and components including explosion-proof parts should achieve the certificate of explosion-proof; domestic fuel dispenser employed in commercial filling station should attain the certificate of taxation function issued by the State Taxation Administration.




—Provided by fuel dispensers