Definition
A stainless-steel or ceramic orifice element that atomises water into micron-size droplets in high-pressure or ultrasonic humidification; typical orifice diameter 0.15–0.40 mm, material AISI 316L or sapphire-reinforced ceramic.
Detailed Explanation
A nozzle is the "screwdriver" of a high-pressure misting system — flow, droplet size and spray angle all depend on this small part. The industry standard is an AISI 316L body with a sapphire or ceramic orifice insert. Typical specs: 0.15–0.40 mm orifice, 1–6 kg/h at 70 bar, 60–90° spray angle, integrated anti-drip valve. Life: 8,000–15,000 h on RO feed; clogs in 2,000–4,000 h on mains water.
Why It Matters
Nozzle choice drives three success factors: (1) DROPLET SIZE — small orifice (0.15 mm) gives small droplets (10–15 μm) and fast evaporation; large orifice (0.40 mm) gives large droplets (25–40 μm) with wetting risk. (2) HYGIENE — stainless is standard; bronze or brass corrode and harbour bacteria. (3) SYSTEM LIFE — scaling rate sets clogging frequency; RO pre-treatment extends nozzle life 3–5×. Wrong nozzle selection costs €20,000–80,000 in extra annual maintenance.
Practical Example
A textile plant in Denizli was first installed with 0.40 mm orifices on mains water (hardness 22 Fr°). After 3 months, 40 of 120 nozzles were clogged and capacity had dropped 30%. NKT analysis: smaller orifice (0.40 → 0.25 mm) plus RO pre-treatment. Over the next 18 months, zero clogs, stable capacity, and annual nozzle replacement cost down 75% (€2,400 → €600).
Engineering Note
Nozzle sizing: total capacity (kg/h) ÷ per-nozzle capacity (kg/h at design pressure) = nozzle count. We always add 15–20% spare capacity in the field — if a few nozzles clog, the total holds. Anti-drip valves are mandatory: residual water in each nozzle (≈ 5–10 ml) is captured rather than dripping. Typical spare stock is 10% (100-nozzle system carries 10 spares). Annual periodic maintenance includes a flow test per nozzle.
NKT Application Link
For this application NKT – Nem Kontrol Teknolojileri supplies the Neptronic SKH high-pressure atomisation system and the Neptronic SKV evaporative humidifier. Unit-selection support is based on space conditions, humidification load and the feed-water analysis; technical service and spare parts are provided. Design and installation of water treatment, as well as engineering design, installation and commissioning, remain within the scope of the facility's designer, contractor and water-treatment specialist.
