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In water treatment and process industries, wedge wire nozzles are essential components for ion exchange columns, sand filters, and activated carbon systems. Selecting the right nozzle is critical for ensuring reliable operation, preventing resin leakage, and maintaining consistent flow distribution.
This article provides a clear datasheet reference, a step-by-step selection checklist, and answers to frequently asked questions.
A wedge wire nozzle (also called a Johnson screen nozzle) is a filter element made of stainless steel V-shaped wire wrapped around a support rod. The design ensures:
• Precise slot size for retaining resin beads
• High open area for maximum flow rate
• Robust construction for long service life
• Corrosion resistance in aggressive water chemistries
They are commonly used in ion exchange columns, pressure filters, and desalination pre-treatment systems.
| Parameter Specification | Options |
| Material | SS304, SS316L, Duplex Stainless Steel |
| Slot Size (mm) | 0.2 - 0.5 mm (customized on request) |
| Nozzle Diameter (mm) | 45 - 70 mm |
| Thread Connection | M20, M25, BSP, NPT custom threads |
| Flow Rate | 0.5 - 3 m³/h (depending on design) |
| Head Loss | < 0.1 bar at nominal flow |
| Max Temperature | Up to 300 °C |
| End Style | Closed or open (cap or nut or threaded type) |
Note: Always confirm compatibility with column design pressure and water chemistry.
Before ordering, engineers should verify the following points:
• Column Diameter & Flow Rate
Calculate the number of nozzles required for uniform distribution.
• Resin Bead Size
Choose a slot size smaller than the resin particle size to prevent leakage.
• Material Compatibility
Select stainless steel grade based on process fluid (chloride content, pH).
• Connection Type
Match the thread or nut connection to the vessel design.
• Pressure & Temperature Ratings
Ensure mechanical integrity under maximum operating conditions.
• Backwash Requirements
Verify nozzle head loss and backwash flow velocity to prevent clogging.
In a cation exchange softener, a 2,000 mm diameter column may require:
• Nozzle quantity: 32 units
• Slot size: 0.2 mm to retain strong acid cation resin
• Material: SS316L for chloride-rich feedwater
• Connection: M25 threaded with locknut
• Design flow rate: 1.5 m³/h per nozzle
This ensures balanced flow distribution and prevents resin escape during service or backwash cycles.
Q1: Can wedge wire nozzles be retrofitted into old vessels?
Yes. Custom adapters and thread sizes can be manufactured for replacement projects.
Q2: How often do nozzles need replacement?
With proper operation, stainless steel nozzles can last 10+ years. Only mechanical damage or chemical attack requires early replacement.
Q3: What is the difference between wedge wire and slotted PVC nozzles?
Wedge wire offers higher strength, better corrosion resistance, and longer life compared to PVC nozzles, especially under high temperature or pressure.
Q4: Can slot size be customized?
Absolutely. The typical range is 0.2–0.5 mm, but smaller or larger slots are available, depending on the resin type.
Key Takeaways
✔ The right wedge wire nozzle specification ensures efficient ion exchange column operation.
✔ Always review slot size, material, and flow capacity before purchase.
✔ Use the selection checklist as a quick guide for specifying replacement or new nozzles.
For engineers, EPC contractors, and plant operators, specifying wedge wire nozzles correctly can save both time and maintenance costs. If you are preparing procurement documents, always request a full technical datasheet and ensure compliance with industry standards.
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