Nozzle Manual Dispenser | 45L/min Flow with Hook | 20mm 25mm Diesel Gas

This manual fuel nozzle gives you direct control over fluid flow up to 45 liters per minute. The lightweight plastic fuel transfer nozzle fits 3/4 inch and 1 inch hoses. It works on 12V pump systems as well as gravity fed farm tanks without sticking. Features and Benefits - Polypropylene body construction - Resists corrosion from diesel, gasoline, kerosene, and water-based workshop fluids. - Built-in hanging hook on the spout - Store the nozzle neatly on tank racks without dripping on the ground. - Trigger with hold-open clip - Dispense fuel continuously on long fills without cramping your hand. - Stepped inlet with barbs - Secure 20mm or 25mm hoses using standard hose clamps for a leak-tight connection. Applications - Dispensing diesel from an elevated overhead gravity tank into farm tractors and backhoes. - Refueling boats and personal watercraft at private docks from mobile 12-volt transfer kits. - Filling lawn mowers and generators from elevated barrels using low-pressure transfer setups. Safety & Materials This fuel nozzle features durable plastic construction suitable for manual dispensing of diesel and gasoline. Because it is a manual unit rated up to 45 L/min, it will not cut off delivery on its own. Users asking how does a fuel nozzle shut off should note that automatic shut-off models rely on an internal venturi tube and diaphragm triggered by rising fluid, whereas this manual dispenser requires the operator to release the trigger. When mounting downstream pipework, ensure all fittings match the 20mm or 25mm inlet sizes. Always earth fuel lines to prevent static build-up when handling petroleum products. Core Parts Needed: To build a digital readout for this dispensing setup, you will need: - An in-line turbine sensor or oval gear flow sensor rated for hydrocarbons - Stainless steel threaded adaptors matching the 20mm or 25mm ports - A micro-controller board such as an Arduino Uno or Nano - A 12V to 5V DC step-down voltage regulator module - A 16x2 I2C character LCD screen - Fuel-resistant sealing tape or thread compound - Screened three-core signal cable - An IP65 sealed project enclosure Hardware Connection & Schematic Plumb the turbine sensor directly into the rigid delivery pipework before the nozzle inlet. If you wonder how fuel flow meter works, internal fluid turns an axial rotor, allowing an external pickup sensor to register passing magnets as digital pulses. Wire the setup using a fused 12V battery feed into the step-down converter to deliver a steady 5V bus. Connect the flow sensor power pin to 5V, ground to system ground, and the signal lead to Arduino digital pin 2. Attach the I2C display using standard 5V, ground, SDA on pin A4, and SCL on pin A5. Calibration & Math Understanding how to make a fuel flow meter accurate requires calibrating the raw pulse train against liquid volume. Every sensor has a characteristic k-factor, defined as pulses per litre. Set up a measured test container, run the nozzle at a steady rate up to its 45 L/min limit, and count the total pulses recorded. Calculate the actual flow rate using the formula: Flow Rate in litres per minute equals pulse frequency in Hertz divided by the k-factor, multiplied by sixty. Adjust the stored calibration constant in software until dispensing readings match the volume measured inside the certified container. Arduino Code Example volatile int pulseCount = 0; float flowRate = 0.0; const float kFactor = 4.5; unsigned long oldTime = 0; void pulseCounter() { pulseCount++; } void setup() { pinMode(2, INPUTPULLUP); attachInterrupt(digitalPinToInterrupt(2), pulseCounter, FALLING); } void loop() { if ((millis() - oldTime) >= 1000) { detachInterrupt(digitalPinToInterrupt(2)); flowRate = ((1000.0 / (millis() - oldTime)) pulseCount) / kFactor; oldTime = millis(); pulseCount = 0; attachInterrupt(digitalPinToInterrupt(2), pulseCounter, FALLING); } }