Based on our typical field experience, two-piece and three-piece hydraulic fine-mist nozzles have a preliminary nozzle-inlet operating-pressure starting range of approximately 24.5–34.3 bar (2.45–3.43 MPa; approximately 356–498 psi), converted from 25–35 kgf/cm², when the goal is good atomization. An impingement misting nozzle uses a target-pin/impingement-pin design; for this family, the effect is commonly better around 39.2–49.0 bar (3.92–4.90 MPa; approximately 569–711 psi), converted from 40–50 kgf/cm², at the nozzle inlet. “Impact pin misting nozzle” is a search synonym, while impingement is the technical term used here.
These ranges are neither rated nor maximum pressures and do not guarantee a result for every nozzle or site. Verify nozzle-inlet pressure with the full zone operating, and never exceed the lowest rated working pressure of the pump, tubing, fittings, valves, filters, holders, nozzle assemblies, or other components.
In this product range, the two-piece hydraulic fine-mist nozzle has no integral strainer. The three-piece version includes an integral strainer (filter screen) that helps intercept particulate debris and may reduce particulate-related blockage risk. It does not make the nozzle clog-free: both versions still need suitable upstream filtration, and the integral screen does not remove dissolved minerals or prevent scale formation.
Typical starting ranges by nozzle family
| Nozzle family | Typical field pressure starting point | Common applications in this product range |
|---|---|---|
| Two-piece hydraulic fine-mist, no integral strainer | Approximately 24.5–34.3 bar | Greenhouse crop spraying, greenhouse cooling, indoor misting, livestock cooling |
| Three-piece hydraulic fine-mist, integral strainer (filter screen) | Approximately 24.5–34.3 bar | Greenhouse crop spraying, greenhouse cooling, indoor misting, livestock cooling |
| Impingement misting, target-pin design | Approximately 39.2–49.0 bar for the typically preferred field effect | Landscape fog, outdoor cooling, sports-area cooling, engineering outdoor spray |
Pump pressure and pump flow are not the same decision
A system can show pressure with one nozzle yet perform poorly when the full zone opens. An ordinary pump may also provide high flow at insufficient pressure. Select a high-pressure pump for both full-zone flow and the intended nozzle-inlet condition:
- Select the family and exact model.
- Obtain verified per-nozzle data under stated conditions.
- Count active nozzles and calculate their combined demand.
- Review pipe diameters, lengths, fittings, and elevation against the pump curve.
- Test the first and final nozzles with the full zone operating.
Why pressure at the final nozzle can differ from the pump
Available pipe outside diameters (ODs) include 32, 20, 16, 12, and 9.52 mm. A large simultaneous zone may require a larger main, while zoning can reduce demand. Many systems use a 20 or 16 mm-OD main with economical 9.52 mm-OD branches; nozzle fittings/holders are generally offered for 12 and 9.52 mm-OD pipe. Supplier guidance is to use these lines below 49.0 bar (4.90 MPa; approximately 711 psi), converted from 50 kgf/cm². This is not a certified universal rating; final allowable pressure depends on exact material, wall thickness, temperature, fittings, and the lowest-rated component.
As a flat-ground field reference, one 9.52 mm-OD branch is commonly planned at about 50–70 m, often with a point approximately every 2 m and two nozzles at each point. If the branch runs beyond the practical capacity of the configured system, the mist at the tail can become weaker than at the front. This is a planning signal, not a universal maximum. A different TW model, nozzle count, pipe route, pump, slope, or elevation can change the result.
Several 9.52 mm lines may suit a small greenhouse; a larger simultaneous area may require a 16, 20, or larger main.
How the TW model affects system demand
The two-piece and three-piece TW range includes TW1010, TW1510, TW2010, TW3010, TW4010, TW5010, TW6010, TW7010, and TW8010. Their confirmed orifice sizes are 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, and 0.80 mm respectively. Within this series, increasing the model number generally moves toward greater flow and a larger amount of spray.
Therefore, changing from a lower TW number to a higher one is not just a nozzle change. It can increase the total flow required from the pump and may affect main-line sizing, branch length, or the number of zones. The rule is relative and specific to this family. No verified per-model flow, droplet-size, or spray-range table is currently available, so approved data is still required to quantify performance.
Pressure planning for impingement layouts
Impingement nozzles are generally used in outdoor applications where the project may prioritize visible landscape fog, cooling coverage, or longer spray reach. Around 39.2–49.0 bar is a typical field range in which the effect is usually better in our experience, subject to exact model and system conditions.
A typical flat-ground reference places two impingement nozzles at approximately 2.5–3 m intervals; approximately 165–170 nozzles per Chinese mu is another flat-ground reference. Convert neither into a final quantity without checking site geometry, slope or elevation, wind, zoning, and pump flow.
Pressure-system checklist
- Identify the exact nozzle family and model.
- Use 24.5–34.3 bar or 39.2–49.0 bar only as a preliminary field starting range.
- Count simultaneous nozzles, not total stored nozzles.
- Confirm both pump pressure and pump flow.
- Draw main and branch pipe diameters and lengths.
- Confirm pipe transitions, fittings, and nozzle-fitting/holder sizes.
- Check the connection drawing: 3/16 is the supplier-identified nozzle thread size for the listed two-piece and three-piece range, while 1/8 is the supplier-identified size for the listed impingement range. The nozzles use installed sealing rings/O-rings, but the sizes alone do not define the thread standard, pitch, form, direction, male/female orientation, sealing-ring seat, or mating-holder geometry.
- Test the complete operating zone, including its final nozzle.
- Record actual test conditions before approving production quantity.
Frequently asked questions
Is 25 bar enough for a misting nozzle?
Approximately 24.5 bar may be a field starting point for some two-piece or three-piece configurations. It is not a universal promise. Exact nozzle model, flow, pipe network, and the desired result must be checked.
Do impingement nozzles require 50 bar?
Approximately 39.2–49.0 bar is a typical range where their effect is usually better in our experience. The exact requirement must be confirmed for the selected nozzle and full layout.
Why does the last nozzle produce weaker mist?
The branch may be too long or too small for the combined demand, the pump may lack adequate flow, or the configured operating zone may be too large. Check the full network rather than replacing the last nozzle immediately.
Can I use an ordinary water pump if its flow is high?
High flow alone does not establish the needed atomization pressure. These applications normally start with a high-pressure pump selected for both required pressure and combined flow.
Get a pressure-and-flow review for your layout
For a B2B system quotation, provide the nozzle application, exact or preferred model, site dimensions, active area per cycle, intended nozzle count, pipe sizes and lengths, elevation information, and available pump details. We can review the working-pressure starting point, total flow requirement, zoning, pipes, fittings, and nozzle connections together. Final pump and nozzle selection should follow engineering review and a representative operating test.