| Nozzle Geometry | Round, oval, slot, fan, multi-orifice, or custom irregular profile | Orifice length, width, aspect ratio, inlet radius, outlet profile, wall thickness, and mounting dimensions | Geometry controls spray distribution, impact pattern, pressure loss, and the risk of localized wear. | Request dimensioned drawings, coordinate tolerances, outlet-profile inspection, and sample-part approval before mass production. |
| Spray Pattern | Solid coneHollow coneFlat fanCustom | Target coverage shape, overlap requirement, spray uniformity, and allowable edge-loading | The correct pattern ensures even surface coverage and helps prevent streaks, dry zones, or excessive overspray. | Compare pattern images or distribution scans at the actual operating pressure and fluid viscosity. |
| Spray Angle | 15°–120° nominal, depending on geometry and pressure | Included spray angle at a defined pressure, stand-off distance, and liquid condition | A wider angle covers more area but generally reduces impact intensity at the same flow rate and distance. | Verify the angle at multiple pressures; the stated angle should not be treated as constant across the full operating range. |
| Liquid Flow Rate | Approximately 0.5–100 L/min per nozzle | Required flow at operating pressure, fluid temperature, density, viscosity, and specific gravity | Flow rate determines pump capacity, material consumption, coverage, and process throughput. | Ask for a pressure-versus-flow curve and a flow-rate tolerance, commonly expressed as a percentage of the nominal value. |
| Operating Pressure | Typically 1–20 bar; application-dependent | Minimum, nominal, and maximum pressure, including pressure fluctuations during operation | Pressure affects flow rate, spray angle, droplet formation, atomization, and wear rate. | Confirm pressure rating, hydrostatic test method, and performance data at the intended operating point. |
| Particle or Droplet Size | Approximately 50–1,000 µm for hydraulic spray; atomizing designs may be finer | Required droplet-size metric such as Dv10, Dv50, Dv90, or Sauter Mean Diameter | Particle size influences evaporation, penetration, drift, coating quality, filtration requirements, and environmental control. | Require the measurement method, instrument type, sampling position, liquid properties, and operating pressure used for testing. |
| Ceramic Material | Alumina, zirconia, silicon carbide, or other application-specific ceramic | Material grade, purity, density, hardness, fracture toughness, and chemical compatibility | Material selection affects abrasion resistance, thermal stability, corrosion resistance, and service life. | Check material certificates, batch traceability, sintering controls, and compatibility with the sprayed chemical or slurry. |
| Abrasive-Wear Resistance | Select high-hardness ceramic for slurries and suspended solids | Particle concentration, hardness, size distribution, velocity, and expected service hours | Abrasive media can enlarge the orifice and change flow rate and spray pattern over time. | Request comparative wear-test results using a representative slurry rather than relying only on a material hardness value. |
| Chemical Resistance | Must match pH, solvents, salts, oxidizers, and process temperature | Fluid composition, pH range, temperature, concentration, and exposure duration | Chemical attack can weaken the ceramic, affect mounting components, or change the internal flow surface. | Confirm compatibility for both the ceramic and any metal, elastomer, or adhesive used in the nozzle assembly. |
| Dimensional Tolerance | Critical orifice dimensions commonly controlled to approximately ±0.02–0.10 mm | Orifice size, profile accuracy, concentricity, flatness, mounting fit, and allowable variation between lots | Tight control improves interchangeability and keeps flow and spray-pattern variation within process limits. | Review inspection plans, calibrated measurement equipment, capability data, and a defined acceptance standard. |
| Surface Finish | Application-specific; smoother internal passages generally reduce turbulence and buildup | Internal roughness, polished areas, edge condition, chips, cracks, and glaze quality | Surface condition influences pressure loss, clogging tendency, particle retention, and repeatability. | Specify inspection criteria for the wetted passage and require visual or microscopic inspection of the outlet edge. |
| Clogging Control | Orifice passage typically sized according to the largest solids and filtration level | Maximum particle size, filter mesh, solids loading, flushing method, and clean-out frequency | An undersized orifice can cause frequent blockage, unstable flow, and unplanned maintenance. | Ensure the manufacturer provides a recommended filtration level and verifies passage continuity on every part. |
| Thermal Capability | Many technical ceramics tolerate high temperatures; assembly limits may be lower | Continuous temperature, thermal cycling, heating rate, cooling rate, and mounting stress | Thermal shock and uneven expansion can cause cracking even when the ceramic's nominal temperature limit is high. | Evaluate the complete nozzle assembly, including holder, seal, adhesive, and connection hardware. |
| Connection and Installation | Threaded, flanged, clamp-mounted, insert-style, or custom holder | Connection standard, sealing method, insertion depth, orientation, torque, and replacement procedure | Correct installation prevents leakage, misalignment, vibration damage, and accidental over-tightening. | Request installation instructions, recommended torque values, spare-part dimensions, and an alignment tolerance. |
| Quality Documentation | Inspection record and traceable batch documentation | Material certificate, dimensional report, flow test, pressure test, visual inspection, and lot identification | Documented controls make it easier to identify process drift and maintain consistent spray performance. | Prefer suppliers able to provide first-article inspection, production sampling plans, nonconformance control, and traceability. |
| Validation Testing | Prototype testing followed by pilot-lot verification | Actual fluid, pressure, temperature, stand-off distance, spray overlap, and operating cycle | Laboratory specifications may not predict performance with high-viscosity, abrasive, or chemically aggressive fluids. | Choose a manufacturer willing to produce samples, test under your process conditions, and document acceptance criteria. |