Double Venturi Boron Carbide Blast Nozzle

Our Double Venturi boron carbide nozzle features a dual-Venturi internal flow design with circumferential secondary air induction ports.

the core liner is made of hot-pressed B4C ceramic, matched with lightweight aluminum protective jacket. Compared with single venturi nozzles, 

it draws extra ambient air to boost total airflow, expands blasting width by 30%–35%, and evenly distributes abrasives across large workpieces. 

Perfect for continuous all-day blasting operations, drastically cutting nozzle replacement frequency, machine downtime and overall operating cost.

Why Choose Our Boron Carbide Double Venturi Nozzle?

Ultra-High Purity Boron Carbide (97–99% B4C)

Our boron carbide liner contains 97–99% B4C with only 0.5–2% trace sintering additives and less than 1.5% total impurities, ensuring maximum hardness and wear resistance.

Performance Advantages

· Boron Carbide Content: 97–99% 

· Trace Sintering Aid: 0.5–2% 

· Total Impurities: <1.5% 

· Hardness: HRA 92–94 

· Typical Service Life: 600–1000 hours 

· Ideal for continuous pressure blasting using:

o Steel Grit

o White Fused Alumina

o Brown Fused Alumina

o Silicon Carbide

o Glass Beads

Key Material Advantages, Outstanding Wear Resistance

Boron carbide is recognized as one of the hardest engineering ceramics available.

· Mohs Hardness: 9.36 

· 3–5× longer life than Silicon Carbide nozzles

· 5–10× longer life than Tungsten Carbide nozzles

· Significantly reduces downtime and replacement costs

Lightweight Construction

· Density: 2.46–2.52 g/cm³ 

· Much lighter than tungsten carbide

· Reduces operator fatigue during long blasting shifts

Excellent Chemical Stability

· Outstanding resistance to acid and alkali corrosion

· Stable performance in harsh dust environments

· Excellent dimensional stability during long-term blasting

Technical Specifications

Working Pressure

Recommendation: Continuous operation at 5–7 bar provides the highest blasting efficiency and optimal dual-air suction performance.

Important

Because boron carbide is extremely hard but relatively brittle, avoid sudden pressure spikes and frequent high-pressure start/stop cycles.

Working Temperature

Warning

Never cool a hot nozzle with water or expose it to sudden thermal shock, as rapid temperature changes may crack the boron carbide liner.

Double Venturi Design Advantages

Unlike conventional single Venturi nozzles, our Dual Air Inlet Venturi Nozzle features a specially engineered three-stage airflow system that maximizes abrasive acceleration while increasing blasting coverage.

1. Dual Air Inlet Technology

Secondary air enters through the annular air inlet ports to create strong negative pressure.

Benefits:

· More than 40% higher airflow 

· 30–35% wider blasting pattern 

· Faster cleaning over large surfaces

2. Uniform Abrasive Distribution

The extended diffusion section evenly distributes abrasive particles to eliminate concentrated impact.

Advantages:

· More consistent surface finish

· Reduced local over-blasting

· Better roughness uniformity

3. Three-Stage Venturi Flow Channel

Optimized internal geometry includes:

· Front contraction section

· Secondary air suction chamber

· Rear diffusion section

This design maximizes abrasive velocity while maintaining stable airflow.

4. Detachable Aluminum Protective Jacket

The aluminum outer jacket protects the boron carbide liner from accidental impacts.

Benefits include:

· Easier maintenance

· Lower replacement cost

· Longer overall nozzle life

5. Precision Hot-Pressed Inner Bore

Each nozzle features a precision hot-pressed boron carbide liner with tight dimensional tolerances.

Advantages:

· Stable jet pattern

· Higher blasting efficiency

· Reduced early bore expansion

· Consistent performance over extended service life

Double Venturi vs. Single Venturi Nozzle

Compatible Abrasives

Our boron carbide blast nozzle is compatible with most common blasting media:

· Steel Grit

· Steel Shot

· White Fused Alumina

· Brown Fused Alumina

· Silicon Carbide

· Glass Beads

· Garnet

· Aluminum Oxide

· Mineral Slag Abrasives

Applications

Marine & Shipbuilding

· Hull rust removal

· Deck preparation

· Old paint stripping

· Ship maintenance

Steel Structure Fabrication

· Bridge maintenance

· Structural steel cleaning

· Storage tanks

· Pipelines

· Offshore platforms

Automotive & Heavy Equipment

· Truck restoration

· Construction machinery

· Agricultural equipment

· Vehicle chassis preparation

Industrial Surface Preparation

· Metal profiling

· Oxide removal

· Surface texturing

· Coating preparation

Stone & Glass Processing

· Decorative etching

· Matte finishing

· Surface roughening

Standard Specifications

Boron carbide liner with aluminium jacket and threads or middle flage

Thread style: BR-DVA series 1-1/4, 11-1/2 N.P.SM

                      BR-DVB series 2, 4-1/2 U.N.C 

Packaging

· Individual protective plastic tube

· Export carton packaging

· OEM packaging available

 OEM & Custom Manufacturing

We support customized production including:

· Custom bore diameter

· Custom overall length

· Metric or imperial threads

· OEM branding

· Private label packaging

· Bulk wholesale orders

 Operation & Maintenance Tips

To maximize nozzle life and blasting efficiency:

· Always use the aluminum protective jacket.

· Use clean, dry abrasive media to prevent blockage of the secondary air inlets.

· Replace the nozzle when the inner bore has expanded by more than 10%.

· Allow the nozzle to cool naturally after high-temperature operation.

· For a 10 mm double Venturi nozzle, use an air compressor capable of supplying at least 6 m³/min of airflow.

Frequently Asked Questions

Why choose boron carbide instead of tungsten carbide or silicon carbide?

Boron carbide offers the highest wear resistance among commonly used blasting nozzle materials. It typically lasts 5–10 times longer than tungsten carbide and 3–5 times longer than silicon carbide, reducing replacement costs and production downtime while its lighter weight helps minimize operator fatigue.

What is the difference between a double Venturi nozzle and a straight bore nozzle?

A straight bore nozzle delivers a narrow, high-impact jet suited to spot blasting. A double Venturi nozzle introduces secondary airflow to create a wider blast pattern, increasing cleaning speed and improving efficiency on large flat surfaces.

Can this nozzle operate continuously at 7 bar?

Yes. Our high-purity 97%+ B4C liner is designed for continuous industrial blasting under 5–7 bar, supporting full-shift operation with stable performance and minimal bore wear.

Can you customize sizes and threads?

Yes. We offer OEM and custom manufacturing for bore diameter, nozzle length, thread type, branding, and packaging to meet your equipment and project requirements.