Nozzle Auto Shut Off | Aluminum Alloy Body | Heavy-Duty Diesel Dispenser

This automatic shut off fuel nozzle controls diesel and gasoline delivery without spills. Built with a cast aluminum body that handles daily drops, it uses an internal venturi sensor that cuts off flow the moment fuel covers the spout tip. It connects right to standard electric transfer pump hoses. Features and Benefits - Venturi-action shut-off mechanism - Shuts off flow automatically to stop tank overflows - Cast aluminum nozzle housing - Withstands hard bumps and drops around busy service areas - Three-position latch clip - Lets you run hands-free refueling without tiring your grip - Threaded inlet with internal seals - Prevents dripping and air leaks under line pressure Applications - Diesel transfer pump setups on agricultural storage tanks - Commercial vehicle fleet refueling stations and yard tanks - High-output skid tanks running standard pump dispensers Safety & Materials This fuel nozzle features a heavy-duty aluminum alloy body designed for hard workshop and forecourt use. The casting handles working pressure up to 0.18 MPa without weeping at the joints. It delivers fluid compatibility across diesel, gasoline, and kerosene. Auto shut-off functions via an internal venturi system. As liquid reaches the 24 mm outlet tip, it blocks a tiny vacuum port, causing the internal diaphragm to trip the main poppet valve closed instantly. Always ensure bonding wires are attached to prevent static discharge when transferring volatile fuels, and inspect the inlet threads for thread tape debris before connecting your fuel line. Core Parts Needed: To build a complete digital dispensing station with this nozzle, you need specific inline hardware: - Heavy-duty diesel dispenser nozzle with 19 mm inlet and 24 mm outlet - Inline turbine sensor housing compatible with diesel and kerosene - Hall effect pickup sensor rated for volatile fuel exposure - Stainless steel internal shaft and turbine assembly - Microcontroller development board running at 5V logic - 12V DC power supply or vehicle battery with stepped-down voltage regulation - Fuel-rated 19 mm delivery hose, swivels, and earthing clips Hardware Connection & Schematic How a fuel flow meter works depends on mechanical displacement turning into electrical pulses. Thread the turbine sensor directly upstream of the 19 mm nozzle inlet using fuel-resistant paste. The internal fluid passage spins the rotor, which sweeps past the external pickup sensor. Supply the sensor with clean power, typically dropping a 12V vehicle system down to a regulated 5V rail for the electronics. Connect the sensor signal wire directly to an interrupt-capable digital input pin on your controller board. Tie all system grounds together, and ground the aluminum alloy nozzle body to discharge static before fuel transfer starts. Calibration & Math Knowing how to make a fuel flow meter accurate requires calibrating the raw pulse output against known liquid volume. Turbine sensors generate a specific number of pulses per litre, known as the K-factor. Because this unit handles a flow rate between 0-60 L/min, run exactly ten litres of diesel into a calibrated measuring vessel at your normal operating speed. Count the total raw pulses registered by the controller. Divide that total count by ten to find your pulses per litre. If delivery temperature changes significantly, or if you switch from diesel to thinner kerosene, recheck this calibration factor to maintain trade-level volume tracking. Arduino Code Example volatile unsigned long pulseCounter = 0; const byte sensorPin = 2; const float pulsesPerLitre = 450.0; unsigned long oldTime = 0; void countPulse() { pulseCounter++; } void setup() { Serial.begin(9600); pinMode(sensorPin, INPUTPULLUP); attachInterrupt(digitalPinToInterrupt(sensorPin), countPulse, RISING); } void loop() { if (millis() - oldTime >= 1000) { detachInterrupt(digitalPinToInterrupt(sensorPin)); float litres = (float)pulseCounter / pulsesPerLitre; Serial.print("Dispensed Litres: "); Serial.println(litres); oldTime = millis(); attachInterrupt(digitalPinToInterrupt(sensorPin), countPulse, RISING); } }