Ejector Nozzle for Vacuum Generators | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Ejector Nozzle

Definition

The ejector nozzle is a critical part of vacuum generator/valve systems. It converts high-pressure motive fluid, typically compressed air, into a high-velocity flow through a converging-diverging design. This creates a vacuum by entraining surrounding air or gases via the Venturi effect. The nozzle serves as the primary interface where energy transfer occurs to generate suction for material handling, clamping, or evacuation applications. Available materials include stainless steel, brass, PTFE, and ceramic. Key parameters include operating pressure (1.0–1.6 MPa), flow rate (50–200 L/min at 1.0 MPa inlet), suction capacity (20–80 L/min at 1.0 MPa), nozzle diameter (1.0–3.0 mm), tolerance (±0.05 mm, ISO 2768-m), surface roughness (Ra 0.8–1.6 μm, ISO 1302), operating temperature (-20–80 °C), material grade (stainless steel 304, ASTM A276), weight (0.05–0.2 kg), and connection thread (G1/8–G1/2, ISO 228-1). These values are reference ranges for directory purposes and must be verified for the specific model and application with the legal manufacturer or supplier. The nozzle's performance directly affects system efficiency and reliability. Proper selection requires consideration of motive fluid pressure, required suction capacity, and environmental conditions. Regular inspection for wear, erosion, or blockage is essential to maintain performance. Failure to operate within specified parameters may lead to reduced suction, increased air consumption, or system malfunction. Always consult the manufacturer's documentation for installation, maintenance, and safety guidelines.

Working Principle

High-pressure motive fluid enters the nozzle's converging section, accelerating to supersonic speeds in the throat. This creates a low-pressure zone that entrains surrounding air or gas through suction ports. The mixed flow then expands in the diverging section, converting velocity back to pressure while maintaining vacuum generation. The Venturi effect is fundamental to this process, enabling efficient suction without moving parts.

Common Materials

Stainless Steel, Brass, PTFE, Ceramic

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Pressure	1.0–1.6 MPa	Below 1.0 MPa the seat load is insufficientISO 5208
Flow Rate	50–200 L/min	At 1.0 MPa inlet pressure
Suction Capacity	20–80 L/min	At 1.0 MPa operating pressure
Nozzle Diameter	1.0–3.0 mm	Determines flow and suction
Tolerance	±0.05 mm	Critical for performance consistencyISO 2768-m
Surface Roughness	Ra 0.8–1.6 μm	Affects flow efficiencyISO 1302
Operating Temperature	-20–80 °C	Beyond range may affect sealing
Material	304 Stainless Steel	Corrosion resistantASTM A276
Weight	0.05–0.2 kg	Depends on size
Connection Thread	G1/8–G1/2 inch	Standard pipe threadISO 228-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Converging Section Part
Accelerates motive fluid to sonic velocity

Material: Stainless Steel
Throat Part
Minimum cross-section where fluid reaches maximum velocity

Material: Hardened Steel or Ceramic
Diverging Section
Decelerates flow while recovering pressure

Material: Stainless Steel
Suction Port Part
Entry point for entrained air/gas

Material: Stainless Steel or Brass

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Vacuum Generator/Valve

View system integration details

Manufacturers of Ejector Nozzle

Manufacturer profiles associated with Ejector Nozzle.

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Frequently Asked Questions

What is the operating pressure range for this ejector nozzle?

The reference range is 1.0–1.6 MPa. Always verify the exact range for your specific model with the manufacturer.

What materials are available for the ejector nozzle?

Available materials include stainless steel, brass, PTFE, and ceramic. The stainless steel grade listed is 304 (ASTM A276). Material choice affects corrosion resistance and suitability for different media.

How does the nozzle diameter affect performance?

Nozzle diameter (reference 1.0–3.0 mm) determines flow rate and suction capacity. Larger diameters generally allow higher flow but may reduce vacuum. Confirm the correct size for your application.

What maintenance is required for the ejector nozzle?

Regularly inspect for wear, erosion, or blockage. Check surface roughness (Ra 0.8–1.6 μm) and tolerance (±0.05 mm) to ensure performance. Follow manufacturer guidelines for cleaning and replacement.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar inlet, vacuum down to 0.1 mbar
flow rate:	0.5 to 500 m³/h (air equivalent)
temperature:	-20°C to 150°C
slurry concentration:	Up to 15% solids by weight (non-abrasive)

Ejector Nozzle

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards