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Author: Site Editor Publish Time: 11-05-2026 Origin: Site
Flat fan nozzles are industrial spray nozzles designed to produce a flat, fan-shaped liquid spray pattern. Instead of distributing liquid in a circular or conical pattern, they discharge liquid in a relatively thin, wide sheet.
This spray configuration makes flat fan nozzles particularly suitable for applications that require controlled surface coverage, directional spraying, uniform liquid distribution and effective cleaning.
A typical flat fan nozzle produces a spray pattern with a rela
tively narrow thickness and a wider horizontal distribution. When multiple nozzles are installed in a row, their spray patterns can overlap to create consistent coverage across a larger surface.
Flat fan spray nozzles are widely used in:
Industrial cleaning and washing systems
Conveyor belt cleaning
Surface treatment and coating
Dust suppression
Chemical spraying
Steel manufacturing and cooling
Agricultural spraying
Food and beverage processing
The performance of a flat fan nozzle depends on several engineering factors, including spray angle, operating pressure, flow rate, orifice geometry, liquid properties and installation position.
In simple terms: A flat fan nozzle converts pressurized liquid into a flat spray sheet, making it an effective solution for directional spraying, surface cleaning and controlled industrial coverage.
The working principle of a flat fan spray nozzle is based on converting liquid pressure into a controlled spray pattern through a specially designed internal passage and outlet geometry.
When pressurized liquid enters the nozzle, it passes through the internal flow channel and reaches the spray-forming outlet. Depending on the nozzle design, a shaped orifice or deflector redirects the liquid into a flat fan-shaped pattern.
The resulting spray spreads outward at a defined angle, creating a characteristic fan-shaped distribution.
Main Working Process
Step 1: Liquid enters the nozzle
A pump supplies liquid at a specified operating pressure. The liquid enters through the nozzle inlet and flows toward the internal spray-forming section.
Step 2: Liquid passes through the internal passage
The internal structure controls the direction and velocity of the liquid. The design of the passage and outlet influences the final spray characteristics.
Step 3: The spray pattern is formed
The outlet geometry determines how the liquid is distributed. The liquid exits as a flat fan spray rather than a full cone or hollow cone.
Step 4: The spray reaches the target surface
The fan-shaped liquid sheet spreads across the target area. In multi-nozzle systems, adjacent spray patterns can be arranged to overlap and improve distribution uniformity.
What Determines Spray Performance?
The following factors directly influence the performance of a flat fan nozzle:
Factor | Effect on Spray Performance |
Spray angle | Determines the width of the spray coverage |
Operating pressure | Influences flow rate, velocity and spray characteristics |
Orifice size | Determines the nozzle's nominal flow capacity |
Internal geometry | Affects spray formation and distribution |
Liquid viscosity | Influences flow behavior and spray formation |
Installation height | Changes the coverage width on the target surface |
Nozzle spacing | Determines the overlap between adjacent sprays |
An important consideration is that increasing operating pressure does not automatically guarantee better cleaning or more uniform coverage. The correct pressure must match the nozzle design and application requirements.
Flat fan nozzles are available in several structural designs. Different configurations are developed to meet specific requirements for impact force, spray angle, liquid distribution and installation conditions.
3.1 Standard Flat Fan Nozzles
Standard flat fan nozzles are designed to produce a conventional fan-shaped spray with a relatively uniform distribution across the spray width.
Typical applications include:
General industrial washing
Surface rinsing
Conveyor cleaning
Chemical spraying
General-purpose cooling
They are commonly selected when a controlled flat spray pattern and consistent surface coverage are required.
3.2 Narrow Angle Flat Fan Nozzles
Narrow angle flat fan nozzles produce a concentrated spray with a relatively small spray angle.
Compared with wide-angle designs, they distribute the liquid over a narrower area, which can help increase localized impact and improve targeted cleaning performance.
Typical applications include:
High-impact industrial cleaning
Descaling
Targeted washing
Removal of stubborn surface contaminants
For applications requiring concentrated impact, nozzle selection should consider both spray angle and flow rate rather than spray angle alone.
3.3 Wide Angle Flat Fan Nozzles
Wide angle flat fan nozzles generate a broader fan-shaped spray pattern.
They are suitable for applications requiring a larger coverage area from a relatively short installation distance.
Typical applications include:
General surface washing
Cooling
Dust suppression
Agricultural spraying
Broad-area liquid distribution
However, a wider spray angle does not necessarily mean better coverage uniformity. The spray distribution curve and installation arrangement must also be considered.
3.4 Deflector Flat Fan Nozzles
Deflector flat fan nozzles use a specially shaped deflector surface to redirect the liquid and form a flat fan spray.
Depending on the design, these nozzles can provide relatively large free passages and strong spray impact, making them useful in applications where clogging resistance and cleaning performance are important.
Some narrow-angle deflector designs use a spoon-shaped deflector to create a concentrated spray.
Typical applications include:
Industrial washing
Descaling systems
Heavy-duty cleaning
Applications involving liquids with suspended particles
3.5 High-Impact Flat Fan Nozzles
High-impact flat fan nozzles are designed for applications where cleaning force is a primary requirement.
Their concentrated spray characteristics can deliver higher localized impact when properly matched with operating pressure, flow rate and spray distance.
Typical applications include:
Steel mill descaling
Industrial equipment cleaning
Conveyor belt washing
Removal of heavy deposits
The actual impact performance depends on nozzle geometry, pressure, flow rate, spray distance and target conditions.
Choosing the correct spray pattern is essential for industrial spray system performance.
Although these three nozzle types all use pressurized liquid, their spray distributions and application purposes are different.
Comparison | |||
Spray pattern | Flat fan | Filled circular cone | Hollow circular cone |
Main coverage | Linear or surface coverage | Broad three-dimensional coverage | Annular spray coverage |
Typical purpose | Cleaning and directional spraying | Cooling and general distribution | Fine cooling and gas contact |
Impact characteristics | Often suitable for directional impact | Distributed over a circular area | Distributed around the cone |
Common applications | Washing, descaling, rinsing | Dust suppression, cooling | Gas cooling, humidification |
Which one should you choose?
Choose flat fan nozzles when you need directional spraying, surface cleaning or linear coverage.
Choose full cone nozzles when you need a filled circular spray pattern and broader three-dimensional liquid distribution.
Choose hollow cone nozzles when the process requires liquid distribution around the outer region of a cone, such as certain gas cooling and humidification applications.
The selection should always be based on the required spray pattern and process performance rather than the nozzle name alone.
Selecting a flat fan nozzle requires more than choosing a thread size or spray angle. A suitable nozzle must match the hydraulic conditions, target coverage and operating environment of the system.
The following factors should be evaluated before purchasing.
5.1 Determine the Required Flow Rate
Flow rate is one of the most important parameters in nozzle selection.
It determines how much liquid is discharged over a specific period and directly affects the total water consumption of the spray system.
For a given nozzle design and liquid, flow rate approximately follows this relationship: [ Q_2=Q_1\sqrt{\frac{P_2}{P_1}} ]
Where:
(Q_1) = Initial flow rate
(Q_2) = New flow rate
(P_1) = Initial operating pressure
(P_2) = New operating pressure
For example, if a nozzle delivers 4 L/min at 2 bar, increasing the pressure to 8 bar will theoretically increase its flow rate to approximately 8 L/min.
This relationship is an approximation for the same nozzle and liquid under comparable conditions. Actual performance should be verified using the manufacturer's flow chart.
5.2 Select the Appropriate Spray Angle
Spray angle determines how widely the liquid spreads after leaving the nozzle.
Common industrial flat fan spray angles include narrow, medium and wide-angle configurations. Actual available angles depend on the specific nozzle series.
A larger spray angle generally provides a wider coverage area at the same installation height.
For an ideal geometric fan: [ W=2H\tan(\theta/2) ]
Where:
(W) = Theoretical spray width
(H) = Distance from nozzle to target
(\theta) = Spray angle
For example, at a distance of 500 mm:
30° spray angle: approximately 268 mm coverage width.
60° spray angle: approximately 577 mm coverage width.
90° spray angle: approximately 1,000 mm coverage width.
These values represent ideal geometric estimates. Actual spray width may vary due to nozzle design, pressure, spray distribution and operating conditions.
5.3 Consider Operating Pressure
Operating pressure affects nozzle flow rate, liquid velocity and spray formation.
A nozzle should be selected according to its recommended pressure range rather than simply choosing the highest available pressure.
Before selecting a nozzle, confirm:
Pump discharge pressure
Pressure loss in pipelines
Number of operating nozzles
Required flow per nozzle
Continuous or intermittent operation
It is also important to distinguish pump discharge pressure from actual pressure at the nozzle inlet.
5.4 Choose the Right Material
Material selection influences corrosion resistance, mechanical strength, service life and maintenance costs.
Material | Main Characteristics | Typical Applications |
Stainless Steel 303 | Good machinability and general corrosion resistance | General industrial spraying |
Stainless Steel 304 | General corrosion resistance | Washing and industrial cleaning |
Stainless Steel 316 | Improved resistance to many corrosive environments | Chemical and marine-related applications |
Brass | Good machinability and economical cost | General-purpose spraying |
The suitability of each material depends on the chemical composition, concentration and temperature of the liquid, as well as the operating environment.
For particularly aggressive chemicals, a more specialized alloy or non-metallic material may be required.
5.5 Check Thread Size and Installation Conditions
Common connection options include threaded connections in different nominal sizes.
Before purchasing, confirm:
Thread standard: NPT, BSPT, BSPP or other specified standard
Connection size
Available installation space
Nozzle orientation
Replacement compatibility
Whether a nozzle filter is required
Thread standards should not be assumed interchangeable, even when their nominal sizes appear similar.
Flat fan nozzles are used across a wide range of industries because their spray pattern provides controlled liquid distribution over surfaces and linear processing areas.
6.1 Industrial Cleaning and Washing
Industrial cleaning systems frequently use flat fan nozzles to remove dust, dirt, oil residues and other surface contaminants.
Multiple nozzles can be installed along a spray header to create continuous washing coverage.
Key selection considerations:
Required cleaning impact
Spray angle
Nozzle spacing
Operating pressure
Water quality and filtration
6.2 Steel and Metallurgical Industry
In steel manufacturing, high-impact flat fan nozzles are used in descaling systems to remove oxide scale from hot steel surfaces.
The concentrated spray helps deliver the required hydraulic impact to the target surface.
Nozzle performance must be matched to:
Operating pressure
Water flow rate
Spray distance
Descaling header design
Target surface conditions
6.3 Dust Suppression
Flat fan nozzles can be installed in industrial dust suppression systems to distribute water across selected surfaces or material handling areas.
They are particularly useful where directional surface wetting is required.
However, when the main objective is airborne dust capture, droplet size, evaporation, particle size and air movement must also be evaluated. A full cone or atomizing nozzle may be more appropriate for certain applications.
6.4 Cooling Systems
Flat fan spray nozzles are used in industrial cooling processes where liquid must be distributed over a specific surface or moving material.
Typical applications include:
Metal cooling
Equipment cooling
Conveyor cooling
Process surface cooling
Cooling performance depends on liquid distribution, heat transfer requirements, surface temperature and evaporation conditions.
6.5 Agricultural Spraying
In agricultural equipment, flat fan nozzles are commonly used for crop spraying because their fan-shaped distribution supports controlled application across a working width.
Correct spray angle, droplet characteristics, nozzle spacing and operating pressure are essential for reducing uneven application and minimizing spray drift.
6.6 Chemical Processing
Flat fan nozzles can be used for chemical washing, surface treatment and controlled liquid application in industrial processing lines.
When selecting a nozzle for chemical service, compatibility between the nozzle material and the process liquid must be confirmed.
Even a correctly selected nozzle may experience performance issues if the operating conditions or maintenance procedures are unsuitable.
Problem | Possible Cause | Recommended Solution |
Uneven spray pattern | Partial blockage or damaged orifice | Clean and inspect the nozzle |
Reduced flow rate | Insufficient pressure or blockage | Check pump pressure and filtration |
Inconsistent coverage | Incorrect nozzle spacing | Recalculate spray overlap |
Excessive spray drift | Wind or unsuitable spray characteristics | Adjust angle, distance or nozzle type |
Premature wear | Abrasive particles or material incompatibility | Select suitable material and filtration |
Leakage at connection | Incorrect thread standard or sealing | Verify connection specifications |
How Often Should Flat Fan Nozzles Be Replaced?
There is no universal replacement interval for flat fan nozzles.
Replacement frequency depends on operating hours, liquid quality, material, pressure and the presence of abrasive particles.
A practical maintenance approach is to periodically compare actual nozzle flow rate and spray distribution with the original specifications.
If the flow rate increases significantly or the spray pattern becomes distorted, the nozzle may be worn and should be inspected or replaced.
Shanghai Xinhou Industrial Co., Limited (XINHOU) specializes in industrial spray nozzles and provides spray solutions for different industrial applications.
Our flat fan nozzle product range is designed to support different requirements for spray angle, flow rate, connection size and material selection.
XINHOU Product Advantages
1. Multiple Product Configurations
Different flat fan nozzle structures and spray characteristics are available for industrial cleaning, cooling and surface spraying.
2. Material Options
Depending on the product series, material options can include stainless steel and brass to accommodate different working environments.
3. Application-Based Selection
We help customers evaluate spray angle, flow rate, operating pressure, connection size and application conditions to identify a suitable nozzle configuration.
4. Industrial Application Support
Whether you need individual replacement nozzles or components for a larger spray system, XINHOU can assist with product selection and technical communication.
Looking for a Reliable Flat Fan Nozzle Manufacturer?
If you are sourcing flat fan spray nozzles for an industrial project, providing complete operating information will help us recommend a more suitable product.
Contact XINHOU with the following details:
Required flow rate (L/min)
Operating pressure (bar or MPa)
Spray angle
Connection size and thread standard
Required material
Application and installation distance
Liquid type and operating temperature
Contact XINHOU today to discuss your flat fan nozzle requirements and obtain technical recommendations.
Website: https://www.xinhouspray.com/
Website: https://www.chinaxinhounozzle.com/
Q1: What is a flat fan nozzle used for?
A flat fan nozzle is used to produce a fan-shaped liquid spray for surface cleaning, washing, cooling, dust suppression, chemical spraying and agricultural applications. It is particularly suitable for applications requiring directional spraying and linear surface coverage.
Q2: How does a flat fan nozzle work?
A flat fan nozzle uses a specially designed outlet or deflector structure to convert pressurized liquid into a flat, fan-shaped spray pattern. The spray angle and internal geometry determine the resulting liquid distribution.
Q3: What is the difference between a flat fan nozzle and a full cone nozzle?
A flat fan nozzle produces a flat, fan-shaped spray for directional surface coverage. A full cone nozzle produces a filled circular cone spray for broader three-dimensional liquid distribution. They are designed for different application requirements.
Q4: How do I calculate the coverage width of a flat fan nozzle?
The theoretical coverage width can be estimated using: [ W=2H\tan(\theta/2) ]
Where H is the distance from the nozzle to the target surface and θ is the spray angle. Actual coverage should be checked against the manufacturer's spray distribution data.
Q5: Does increasing pressure increase flat fan nozzle flow rate?
Yes. For the same nozzle and liquid under comparable conditions, flow rate approximately increases in proportion to the square root of pressure. Doubling the pressure does not double the flow rate; it increases flow by approximately 41%.
Q6: Which material is best for flat fan spray nozzles?
Stainless steel 316 is often considered for applications requiring improved corrosion resistance. Stainless steel 303 and 304 and brass may also be suitable depending on the liquid and working environment. Material selection should be based on actual chemical compatibility.
Q7: How can I prevent flat fan nozzles from clogging?
Use suitable upstream filtration, maintain clean liquid, select an appropriate free passage size and inspect nozzles regularly. For liquids containing suspended particles, the internal passage design is particularly important.
Q8: Can multiple flat fan nozzles be installed in a row?
Yes. Multiple flat fan nozzles are commonly installed on spray headers. Their spacing and spray overlap should be calculated according to the nozzle's actual spray distribution profile and installation height.
Q9: What information should I provide when requesting a flat fan nozzle quotation?
Provide the required flow rate, operating pressure, spray angle, connection size, thread standard, material, liquid type and application details. A photograph or drawing of the installation can also help the supplier identify a suitable configuration.
Q10: Can XINHOU provide customized flat fan nozzles?
Customization and product availability depend on the required design, dimensions, materials and manufacturing feasibility. Contact XINHOU with your technical specifications for evaluation.
Shanghai Xinhou Industrial Co., Limited is an industrial spray nozzle supplier offering flat fan nozzles, full cone nozzles, atomizing nozzles and other industrial spraying solutions. XINHOU supports customers in selecting suitable nozzle products according to application requirements and operating conditions.
