Fire Nozzles

A fire nozzle is the device fitted to the end of a fire hose that controls the direction, flow, and pattern of water being discharged onto a fire. It allows firefighters to adjust how water is delivered, from a narrow, high pressure jet for long range reach, to a wider spray pattern for covering larger areas or cooling surfaces. Some nozzles also allow flow shut off and variable control for more precise application. Fire nozzles are designed to improve firefighting efficiency by giving the operator control over water usage, reach, and application, helping to match the water stream to the type and intensity of the fire.

A fire nozzle works by controlling and shaping the water flow as it exits the fire hose, allowing the operator to direct water precisely onto a fire. Water is supplied under pressure through the hose from a pump or hydrant. As it enters the nozzle, the internal design regulates the flow and converts the pressurised stream into a controlled discharge pattern. The operator can typically adjust the nozzle to change the flow rate and the spray pattern, depending on the fire conditions. Most nozzles allow switching between a solid jet stream, which provides long range and penetration, and a spray pattern, which spreads water over a wider area for cooling and fire knockdown. Some nozzles also include an on off control, allowing the water supply to be stopped at the nozzle

A fire nozzle is used to control how water is directed from a fire hose onto a fire. It is operated by adjusting the nozzle to select the required flow and spray pattern, then aiming the discharge at the base of the fire. To use a fire nozzle, ensure the hose is fully charged with water and the coupling is secure. Open the nozzle to release water, then direct the stream towards the seat of the fire. The operator can adjust the nozzle to change between a narrow jet for distance and penetration or a wider spray pattern for cooling and coverage. The nozzle should be handled firmly due to hose pressure reaction, and movements should be controlled to maintain accuracy and effectiveness. Water flow should be adjusted as needed to match fire conditions and minimise unnecessary water use.

A fire nozzle should be held firmly with both hands to maintain control and manage hose reaction when water is flowing. The rear hand is typically placed on the control or shut off section of the nozzle to operate the water flow, while the front hand supports and stabilises the nozzle body. This two handed grip helps control direction, absorb pressure from the hose, and keep the water stream accurately aimed at the fire. The operator should maintain a stable stance, keeping the nozzle directed towards the base of the fire and adjusting position as needed to stay balanced under changing pressure and flow conditions

The pressure at the nozzle of a fire hose is not a fixed value, as it depends on the system design, pump output, hose diameter, length, and flow requirements. In typical firefighting operations, nozzle pressures are generally in the range of around 50 to 100 PSI (approximately 3.5 to 7 bar) for hand controlled attack lines. This range is used to balance effective water reach and spray pattern control while keeping the hose manageable for the operator. Higher pressures may be used in specific systems or for specialised nozzles, but in practice the pressure at the nozzle is always managed through the pump and system setup to ensure safe handling, effective flow, and reduced hose reaction

An automatic fire nozzle is a type of firefighting nozzle that automatically adjusts its internal opening to maintain a consistent pressure and spray pattern as water flow conditions change. As flow demand increases or decreases, the nozzle self regulates internally to help maintain a stable stream, ensuring effective reach and coverage without the need for constant manual adjustment. A good example is the Delta Fire DM600 Automatic Fire Nozzle, which is designed to deliver consistent performance across a range of flows, helping operators maintain control and efficiency during firefighting operations

Fire hose nozzles should only be repaired or serviced by trained personnel, as they are critical safety components used under pressure. At Delta Fire, we hold spare stock of fire nozzles and offer a training service to show customers how to carry out basic maintenance and repairs themselves where suitable. Alternatively, nozzles can be returned to us where we can service and repair damaged or faulty units, ensuring they are restored to full working condition and tested before being returned to service.

Delta Fire fire nozzles are supplied with a manufacturer backed warranty of up to 10 years, covering manufacturing defects and ensuring long term performance when used and maintained correctly. Each nozzle is flow and pressure tested before shipment and is guaranteed against manufacturing defects as part of this warranty. Delta Fire also provides ongoing UK based service support, including maintenance, servicing, and technical assistance throughout the product lifecycle. In addition, customers can access training and support services to help with correct operation and basic maintenance. Where required, nozzles can also be returned to Delta Fire for inspection, servicing, and repair, helping extend service life and ensure continued safe operation