A flat fan spray nozzle produces a line-shaped, tapered-edge spray that is the default choice wherever a process needs even coverage across a width rather than a filled area or a ring. This guide explains how spray angle and impact trade off against each other, where Jeltecn’s CC series fits, and the checks that prevent a flat fan nozzle from underperforming once it is installed.
Quick answer: when should you specify a flat fan nozzle?
Specify a flat fan nozzle when the process needs a uniform line or sheet of liquid — header coverage across a conveyor or web, targeted impact cleaning, or an overlapping bank of nozzles delivering even coverage across a width. Use a narrow angle (roughly 15°-40°) when impact and cleaning force matter most; use a wide angle (roughly 80°-120°) when coverage area and finer atomization matter more than throw distance. If the target is a filled circular or square area instead of a line, a helkjeglemunnstykke is usually the better starting point.
How flat fan nozzles work
A flat fan nozzle shapes the internal orifice so the liquid exits as a thin sheet that breaks up into a tapered, line-shaped spray rather than a cone. The tapered edge is a deliberate design feature: it lets adjacent nozzles in a header overlap at the edges without creating a heavy double-coverage streak down the centerline, which is why flat fan nozzles are the standard choice for multi-nozzle headers and manifolds.
Jeltecn’s CC series covers the full range from a near-zero-degree solid stream through a 120° wide fan, produced from the same basic body with different internal geometry. Because flow and pressure interact directly with droplet size and impact, the same nozzle can be tuned toward a cleaning-oriented setup (higher impact, coarser drops) or a coverage-oriented setup (lower impact, finer drops, wider angle) largely by adjusting the operating pressure within the rated range and choosing the correct angle at the outset.
Choosing a spray angle: impact vs. coverage
| Spray angle range | Impact force | Coverage width | Typical use |
|---|---|---|---|
| 0°-25° (near solid stream) | Very high | Narrow | Cutting, descaling, aggressive spot cleaning |
| 25°-50° | High | Moderate | General industrial cleaning, skylling |
| 50°-80° | Moderate | Wide | Header/manifold coverage, kjøling |
| 80°-120° | Low | Very wide | Fukting, light cooling, broad coverage at short range |
As a rule of thumb, customers whose main goal is cleaning strength typically select an angle around 50°-60°, while customers whose main goal is humidification or broad atomization typically select 90°-110°. The wider the angle, the better the atomization and the weaker the direct impact at a given pressure and distance.
Where flat fan nozzles are used
- Industrial cleaning and rinsing on parts washers, conveyor lines, and equipment wash-down stations.
- Header and manifold coverage for cooling, belegg, or product transfer across a moving line width.
- Surface coating and lubrication where an even sheet of liquid or oil must be applied across a strip or roll.
- Descaling and de-scaling in metal processing using narrow-angle, high-impact fan patterns.
- Dust and odor control using wider-angle patterns for broader, gentler coverage.
CC series specifications
| Parameter | CC series |
|---|---|
| Pattern | Flat fan (0°-120°) |
| Materiale | 303SS / 316SS / Messing |
| Thread size | 1/8″ up to 2″ |
| Thread type | BSPT, PT, male, female |
| Orifice diameter | 0.66-8.7 mm |
| Water pressure | 0.3-10 bar |
| Kapasitet | 0.93-1230 L/h |
| Sertifisering | ISO 9001:2015, SGS, CE |
These figures are selection references for Jeltecn’s current flat fan spray nozzles for industries, including wide-angle and narrow-angle variants, combined fan, self-cleaning, and quick-release configurations. Confirm the exact operating point against a model-specific data sheet before releasing a purchase order.
Flat fan vs. full cone vs. hul kjegle
| Pattern | Coverage shape | Best starting fit |
|---|---|---|
| Flat fan | Line or sheet | Header coverage, rengjøring, coating a moving line |
| Full cone | Filled circle or square | Avkjøling, vask, dust control, chemical distribution |
| Hollow cone | Annular ring | Gas-liquid contact, finer atomization needs |
For a full side-by-side comparison with worked selection scenarios, see Flat Fan vs. Full kjegle dyse: Which Spray Pattern Fits Your Application? To review filled-area coverage options, see the full cone spray nozzle guide.
Engineering variables to verify before ordering
- Pressure at the nozzle. Impact force and droplet size both depend on the pressure actually delivered at the nozzle face, not the pump discharge pressure.
- Overlap and header spacing. Confirm spacing against the specific angle and mounting height to achieve uniform coverage without heavy double-coverage streaks.
- Stand-off distance. Impact force and effective coverage width both change with distance from the target; verify at your actual installation distance.
- Orifice wear. A thin-sheet orifice is more sensitive to erosion from abrasive liquids than a full cone orifice; monitor pattern degradation over time.
- Material compatibility. Match stainless steel or brass to fluid chemistry, temperature, and cleaning method (e.g., CIP chemicals).
- Mounting angle relative to the target. Flat fan nozzles are directional; confirm orientation tolerance if nozzles will be mounted at an angle rather than perpendicular to the surface.
What to include in an RFQ for flat fan nozzles
Send the following so Jeltecn can confirm fit and quote accurately on the first pass:
- Application and required outcome (cleaning force, coverage width, coating thickness)
- Fluid type, viscosity, solids content, and temperature
- Required flow and available pressure range at the nozzle
- Stand-off distance, target width, and whether nozzles will be arranged in a header
- Connection standard, material, and required certification
- Quantity, destination, and required documentation
Send Jeltecn your flat fan nozzle requirements for selection support and a quotation. For critical cleaning or coating lines, request a coverage/overlap review before finalizing header spacing.
Frequently asked questions
What spray angle gives the strongest cleaning force?
Narrower angles, roughly 0°-40°, concentrate flow into a smaller area and deliver the highest impact at a given pressure and distance, making them the standard choice for descaling and aggressive spot cleaning.
Can one flat fan nozzle body produce different angles?
Jeltecn’s CC series is manufactured across the full 0°-120° range using the same basic body with different internal geometry, so the angle is selected at the time of order rather than adjusted in the field.
How do I prevent streaking in a header arrangement?
Streaking usually comes from incorrect spacing relative to the spray angle and mounting height, or from mixing worn and new nozzles in the same header. Confirm spacing calculations against the actual angle and height, and replace nozzles as a set when wear becomes uneven.
Why is my flat fan nozzle producing an uneven or split pattern?
An uneven or split fan pattern is most often caused by partial blockage or wear at the orifice edges. See the spray nozzle clogging and prevention guide for a full troubleshooting checklist.
What material should I choose for CIP or chemical cleaning lines?
316 stainless steel is generally preferred over 303SS or brass for chemical exposure and washdown environments; confirm compatibility against your specific cleaning chemistry and concentration.
Related reading
See the full cone spray nozzle guide, the flat fan vs. full cone comparison, and the spray nozzle clogging and prevention guide for related selection criteria.