Abstract: A single meter blending fuel dispensing system utilizing a pair of proportional flow control valves each having a pressure transducer positioned aft of the valve flow control mechanism. A computer controller is used to program a desired fuel mixture by varying the pressure for each flow control valve. A pressure decrease in one valve produces a corresponding pressure increase in the other valve. A third pressure transducer can be situated downstream of the valves and is set such that the pressure it receives cannot exceed that of the two valve pressures. Flow meters can be substituted for the pressure sensors. A calibration method for calibrating the positive displacement meter is also disclosed. At installation the positive displacement meter is at its most accurate and is synchronized with the less accurate pressure sensors or flow meters.

Abstract: A single meter blending fuel dispensing system utilizing a pair of proportional flow control valves each having a pressure transducer positioned aft of the valve flow control mechanism. A computer controller is used to program a desired fuel mixture by varying the pressure for each flow control valve. A pressure decrease in one valve produces a corresponding pressure increase in the other valve. A third pressure transducer can be situated downstream of the valves and is set such that the pressure it receives cannot exceed that of the two valve pressures. Flow meters can be substituted for the pressure sensors. A calibration method for calibrating the positive displacement meter is also disclosed. At installation the positive displacement meter is at its most accurate and is synchronized with the less accurate pressure sensors or flow meters.

Abstract: A single meter blending fuel dispensing system utilizing a pair of proportional flow control valves each having a pressure transducer positioned aft of the valve flow control mechanism. A computer controller is used to program a desired fuel mixture by varying the pressure for each flow control valve. A pressure decrease in one valve produces a corresponding pressure increase in the other valve. A third pressure transducer can be situated downstream of the valves and is set such that the pressure it receives cannot exceed that of the two valve pressures. Flow meters can be substituted for the pressure sensors. A calibration method for calibrating the positive displacement meter is also disclosed. At installation the positive displacement meter is at its most accurate and is synchronized with the less accurate pressure sensors or flow meters.

Abstract: A fuel dispenser for delivering fuel to a user having a dispenser housing and a fuel delivery system including a storage tank, fuel delivery lines extending from the storage tank to the dispenser housing and a fuel pump. A hose extends from the dispenser housing between the fuel delivery line and includes a nozzle mounted on the hose end opposite the dispenser housing. A receptacle is positioned on the dispenser housing for storing the nozzle when not in use. The receptacle includes a sensor for detecting the presence of the nozzle within the receptacle. The sensor transmits a first signal to the fuel pump when the nozzle is removed from the receptacle resulting in the fuel pump being activated to allow for fuel to flow from the storage tank to the nozzle. The sensor sends a second signal when the nozzle is replaced in the receptacle resulting in deactivating the fuel pump.

Abstract: A check valve for a metering device having a negligible pressure drop thereacross includes a valve seat defining an inlet flow region, an open support frame projecting outwardly from the valve seat to define an outlet flow region having a predetermined flow area greater than the flow area of the inlet flow region and a valve member slidably mounted to the support frame and biased thereagainst for reciprocal movement between a flow blocking position and a flow sustaining position.