An apparatus for dispensing liquid fuel comprises a plurality of inlet valves, each connected in-line with a respective inlet pipe in fluid communication with a respective source of a specific liquid fuel. A plurality of outlet valves are also provided, each connected in-line with a respective outle
An apparatus for dispensing liquid fuel comprises a plurality of inlet valves, each connected in-line with a respective inlet pipe in fluid communication with a respective source of a specific liquid fuel. A plurality of outlet valves are also provided, each connected in-line with a respective outlet pipe. A respective fuel hose is in fluid communication with each of the outlet pipes. The apparatus further comprises a coriolis flow meter located between the inlet valves and outlet valves, the coriolis flow meter providing a flow signal indicative of flow therethrough. A controller is operative to receive the flow signal and control the valves such that selected inputs of specific liquid fuels are dispensed to at least one of the fuel hoses. In accordance with an exemplary embodiment, the selected inputs of specific liquid fuels may include individual liquid fuels and blended combinations thereof. For example, the specific liquid fuels may include at least two of the following: a first octane gasoline, a second octane gasoline, diesel fuel, biodiesel and ethanol.
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1. Apparatus for dispensing liquid fuel, said apparatus comprising: a plurality of inlet valves, each of said inlet valves being a proportional valve and connected in-line with a respective inlet pipe in fluid communication with a respective source of specific liquid fuels;a plurality of outlet valv
1. Apparatus for dispensing liquid fuel, said apparatus comprising: a plurality of inlet valves, each of said inlet valves being a proportional valve and connected in-line with a respective inlet pipe in fluid communication with a respective source of specific liquid fuels;a plurality of outlet valves, each of said outlet valves connected in-line with a respective outlet pipe;a respective fuel hose in fluid communication with each of said outlet pipes;a coriolis flow meter located between said plurality of inlet valves and said plurality of outlet valves, said coriolis flow meter providing a flow signal indicative of flow and information indicative of measured density of fluid passing therethrough; anda controller operative to receive said flow signal and control said valves such that selected inputs including blended combinations of said specific liquid fuels are dispensed to at least one of said fuel hoses, said controller operating said inlet valves to maintain said measured density substantially equal to a target density. 2. Apparatus for dispensing fuel as set forth in claim 1, wherein said outlet valves are absolute valves. 3. Apparatus for dispensing fuel as set forth in claim 1, further comprising a single pump located between said plurality of inlet valves and said plurality of outlet valves. 4. Apparatus for dispensing fuel as set forth in claim 3, wherein said single pump is located downstream of said coriolis flow meter. 5. Apparatus for dispensing fuel as set forth in claim 1, wherein said specific liquid fuels include at least two of the following: a first octane gasoline, a second octane gasoline, diesel fuel, biodiesel and ethanol. 6. Apparatus for dispensing fuel, said apparatus comprising: a plurality of inlet valves, each of said inlet valves connected in-line with a respective inlet pipe in fluid communication with a respective source of specific liquid fuels;a plurality of outlet valves, each of said outlet valves connected in-line with a respective outlet pipe;a respective fuel hose in fluid communication with each of said outlet pipes;a coriolis flow meter located between said plurality of inlet valves and said plurality of outlet valves, said coriolis flow meter providing a flow signal indicative of flow therethrough; anda controller operative to receive said flow signal and control said valves such that selected inputs of said specific liquid fuels are dispensed to at least one of said fuel hoses,wherein said controller is operative to perform automatically a reverse flow purging sequence through said coriolis flow meter between dispensing cycles of different ones of said selected liquid fuels and combinations thereof and wherein said apparatus is adapted to draw fuel vapor behind said liquid fuel passing back through said coriolis flow meter during said reverse flow purging sequence. 7. Apparatus for dispensing fuel as set forth in claim 6, further comprising at least one check valve located between a fuel line and a vapor recovery line, said check valve being opened to allow vapor fuel therethrough at a predetermined pressure differential. 8. A method of purging a first liquid fuel in a fuel dispenser having a coriolis flow meter so that a second liquid fuel can be dispensed, said method comprising steps of: initiating a reverse flow of said first liquid fuel through said coriolis flow meter; andcontinuing said reverse flow until the occurrence of a predetermined event indicating fuel lines have been emptied,wherein said predetermined event is detection of at least one of air and fuel vapor by said coriolis flow meter; andwherein said fuel dispenser is a vapor recovery fuel dispenser adapted to supply fuel vapor behind said first liquid fuel during said reverse flow. 9. A method as set forth in claim 8, wherein said vapor recovery fuel dispenser includes at least one check valve between a fuel line and a vapor recovery line thereof to supply said fuel vapor behind said first liquid fuel. 10. A method of purging a first liquid fuel in a fuel dispenser having a coriolis flow meter so that a second liquid fuel can be dispensed, said method comprising steps of: initiating a reverse flow of said first liquid fuel through said coriolis flow meter; andcontinuing said reverse flow until the occurrence of a predetermined event indicating fuel lines have been emptied,wherein said predetermined event is detection of a selected quantity of said first liquid fuel during said reverse flow thereof. 11. Apparatus for dispensing fuel, said apparatus comprising: an inlet in fluid communication with a source of liquid fuel;a coriolis flow meter located downstream of said inlet to measure flow of said liquid fuel, said coriolis flow meter providing a first signal indicative of flow therethrough;an inlet valve operative to allow flow of said liquid fuel into said coriolis flow meter;a non-coriolis flow meter located downstream of said inlet, said non-coriolis flow meter providing a second signal indicative of flow therethrough;a fuel hose and nozzle located downstream of said coriolis flow meter and said non-coriolis flow meter; anda controller operative to compare said first signal and said second signal to assess accuracy of said non-coriolis flow meter. 12. Apparatus as set forth in claim 11, wherein said non-coriolis flow meter is located downstream of said coriolis flow meter. 13. Apparatus as set forth in claim 12, comprising a single coriolis flow meter and a plurality of said non-coriolis flow meters located downstream thereof along respective branch pipes. 14. Apparatus for dispensing fuel, said apparatus comprising: an inlet pipe in fluid communication with a source of liquid fuel to provide a flow of said liquid fuel therethrough;an air source operative to inject a gaseous phase component into said flow at a selected location therealong;a coriolis flow meter located downstream of said selected location to measure flow of said liquid fuel, said coriolis flow meter providing a signal indicative of flow therethrough. 15. An apparatus as set forth in claim 14, wherein said gaseous component is air. 16. Apparatus for dispensing fuel, said apparatus comprising: an inlet in fluid communication with a source of liquid fuel;a first manifold operative to split flow of said liquid fuel from said inlet into first and second parallel branches;first and second coriolis flow meters in-line said first and second parallel branches, respectively;a second manifold operative to combine flow from said first and second parallel branches;a hose and nozzle; anda flow valve operative to permit flow through said hose and nozzle. 17. Apparatus for dispensing fuel as set forth in claim 16, further comprising a valve to permit flow through only said first coriolis flow meter and through both of said first and second coriolis flow meters depending on flow requirements. 18. Apparatus for dispensing fuel as set forth in claim 17, wherein said flow requirements are determined by pressure drop across said first and second manifolds.
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이 특허에 인용된 특허 (17)
Reynal Thomas J. (Houston TX) Graber Craig S. (Houston TX), Apparatus and method for determining the measurement accuracy of electronic gas meters.
Mattar Wade M. (Wrentham MA) Thompson Duane T. (Franklin MA) DeCarlo Joseph P. (Wrentham MA) Hussain Yousif (Walton on Thames MA GBX) Chitty Gordon W. (Norfolk MA), Coriolis-type mass flowmeter.
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