Custom Metal Spun Venturi Valves for HVAC & Critical Environments

Over 60 years of precision manufacturing. One-piece metal spun construction. Zero welding. Superior performance.

Metal Craft Spinning has engineered custom venturi valves for HVAC systems, cleanrooms, biological safety cabinets, and critical manufacturing environments for six decades. Our metal spun construction delivers independent airflow control with ±5% accuracy, seamless internal geometry, and rapid response times—without the maintenance headaches of traditional VAV boxes.

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What Are Venturi Valves?

A venturi valve is a precision airflow control device engineered to regulate air or fluid movement in response to pressure changes. The valve features a distinctive hourglass shape with a movable internal cone that responds automatically to pressure fluctuations—without needing signals from your building’s central control system.

How Venturi Valves Work

Inside the valve’s body, the cone moves forward or backward in response to changes in static pressure. This independent response mechanism allows venturi valves to maintain airflow with remarkable precision—continuously adjusting to conditions without relying on communication between system components.

This independent operation makes venturi valves ideal for:

• Laboratories and cleanrooms requiring precise pressure maintenance
• Biological safety cabinets where immediate response is critical
• Manufacturing facilities where air quality directly impacts operations
• Healthcare environments requiring reliable containment and ventilation
• Variable air volume (VAV) system upgrades where traditional VAV boxes fall short

Venturi Valves vs. Traditional VAV Boxes

Traditional Variable Air Volume (VAV) boxes have served HVAC systems for decades, but they come with inherent limitations:

VAV Box Challenges:

• Signal delays between sensors, controls, and actuators cause frequent system adjustments
• Airflow sensors require regular cleaning to prevent efficiency loss
• Time lags between component communication can create risks in critical environments
• Multi-component design means more potential failure points
• Regular maintenance and recalibration needed

Venturi Valve Advantages:

• Real-time, independent pressure measurement with no signal delay
• Immediate response to pressure changes (no waiting for control system signals)
• Minimal maintenance required (no sensor cleaning or frequent adjustments)
• Factory-calibrated for your specific application requirements
• Single integrated design with no external communication dependency

For standard commercial applications, VAV boxes may be acceptable. But in critical environments where precision air management directly impacts safety and operations, venturi valves deliver superior reliability.

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Why Choose Metal Spun Venturi Valves?

Here’s what sets Metal Craft’s custom venturi valves apart: our manufacturing method.

While most competitors hide or downplay how they make venturi valves, we lead with it. Metal spinning—the core process that has defined Metal Craft for over 60 years—creates superior venturi valve construction that competitors using welding or traditional fabrication simply cannot match.

One-Piece Construction (No Welding)

Unlike multi-part assemblies that are welded together, Metal Craft venturi valves are spun from a single piece of material. This approach delivers three critical advantages:

1. Superior Strength & Integrity: Welding creates stress points and potential failure zones. A one-piece spun valve has no welded seams, no heat-affected zones, and superior structural integrity under pressure.
2. Better Seal & Performance: One-piece construction of your venturi valve means no gaps or discontinuities where leaks could develop. The seamless design prevents pressure disruption that welding can introduce.
3. Superior Internal Geometry: Metal spinning creates a smooth, seamless internal cone surface with optimal fluid dynamics. This Venturi Valve delivers more consistent airflow regulation and better pressure response than welded assemblies with visible weld lines or surface irregularities.

Seamless Internal Design

The internal cone of a venturi valve is critical to its performance. Metal spinning produces a perfectly smooth, seamless interior surface that traditional multi-part fabrication cannot achieve. This seamless geometry:

• Eliminates turbulence in the airflow path
• Enables precise cone movement and positioning
• Reduces friction and improves response time
• Delivers more accurate pressure regulation

Cost Advantage Over Multi-Part Assemblies

Custom metal spinning eliminates tooling costs that traditional fabrication of venturi valves require. Need a different size or specification? No problem. We can modify your design without additional tooling investment. This means:

• Lower unit costs compared to custom-welded assemblies
• Faster turnaround because no tooling setup is required
• Design flexibility allowing you to optimize specifications without cost penalty
• No minimum order quantities driven by tooling amortization

Faster Lead Times

Because metal spinning requires no custom tooling, we deliver custom specifications faster than competitors who use traditional fabrication methods. We work directly from your drawings, modify designs as needed, and get your valves in production quickly.

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Venturi Valve Types & Applications

Constant Volume Venturi Valves

Constant volume valves maintain steady airflow regardless of duct pressure fluctuations. Ideal for applications where consistent air delivery is critical:

• Laboratory fume hoods: Maintain consistent capture velocity even as building pressurization changes
• Biological safety cabinets: Ensure reliable containment with predictable airflow
• Outdoor air intakes: Stabilize supply air in systems exposed to wind pressure variations
• Hazardous material handling areas: Deliver consistent negative pressure for worker safety

Key Benefit: Independence from building pressure changes eliminates the need for extensive room pressurization testing and recalibration.

Actuated (Variable) Venturi Valves

Actuated valves incorporate a movable cone on a shaft, allowing dynamic control where quick adjustments are necessary:

• VAV system upgrades: Replace traditional VAV boxes with venturi valve precision
• Multi-zone HVAC systems: Provide individual zone control without central system dependency
• Emergency ventilation systems: Enable rapid response when containment requirements change
• Modulating applications: Allow gradual flow adjustment based on demand

Key Benefit: Rapid response time makes these ideal for environments where ventilation demands change frequently or where immediate control is essential.

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Materials & Customization

Metal Craft manufactures custom venturi valves in a range of materials, each selected for specific application requirements:

Material Options

Aluminum

• Lightweight for easy installation
• Good thermal conductivity (useful for energy recovery)
• Cost-effective for large volumes
• Anodize coating available for corrosion resistance
• Typical application: Standard HVAC systems, laboratory environments

Stainless Steel

• Superior corrosion resistance for humid or chemical environments
• Enhanced durability in harsh operating conditions
• Meets cleanroom and pharmaceutical facility requirements
• Higher cost than aluminum, justified by longevity
• Typical application: Healthcare, pharmaceutical labs, coastal installations

Carbon Steel

• High strength for high-pressure applications
• Cost-effective for structural robustness
• Coating options (powder coat, epoxy) for corrosion protection
• Typical application: Industrial ventilation, high-pressure systems

Customization Capabilities

Every venturi valve you order from Metal Craft can be customized to your exact specifications:

• Custom diameters: From small medical equipment to large industrial systems
• Flange options: Bolt-down, slip-fit, or custom connection designs
• Pressure range calibration: Factory-set for your specific application requirements
• Thermal insulation: Wrap available to reduce thermal loss and improve energy efficiency
• Coating & finishing: Anodize, powder coat, epoxy, or raw finish options
• Special connections: Threaded, flanged, or custom inlet/outlet configurations
• Integration points: Design for direct actuator mounting or control system integration

The Customization Advantage

Because metal spinning requires no tooling investment, custom specifications don’t mean custom costs. You get the valve engineered exactly for your application without paying premium pricing for “special orders.”

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Technical Capabilities & Specifications

Metal Craft’s metal spinning equipment and CNC capabilities enable us to manufacture venturi valves across a broad range of specifications.

Size Range

• Diameters: Custom sizes from 2″ up to 42″ (larger sizes available upon consultation)
• Length: Custom proportions engineered for your application
• All sizes maintain the precision and seamless construction that defines our process

Pressure Performance

• Operating Range: 0.3 to 3.0 inches of water column (W.C.) standard calibrations
• Accuracy: ±5% airflow regulation at calibrated setpoint
• Response Time: Immediate response to pressure changes (no signal delay)
• Pressure Independence: Operates independently of system pressure fluctuations

Flow Capacity

• CFM Range: Custom designs accommodate flows from 50 CFM to 10,000+ CFM
• Exact flow capacity: Engineered based on your valve diameter, length, and cone design specifications
• Consultation with our engineering team recommended for exact requirements

Tolerance & Precision

• Dimensional Tolerance: ±0.015″ on critical dimensions
• Surface Finish: Smooth internal and external surfaces (no welding marks or defects)
• Concentricity: Precision-spun to ensure true cone alignment and predictable operation
• Balance: Dynamically balanced cone for smooth operation without vibration

Manufacturing Quality Standards

• CNC-controlled production for consistency across all units
• 100% dimensional inspection of critical tolerances
• Pressure testing available for critical applications
• Full traceability and documentation for compliance requirements
• Metal Craft’s 60+ year reputation for precision manufacturing

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Why Choose Metal Craft Spinning?

60+ Years of Precision Manufacturing In Metal Spinning

Since 1964, Metal Craft has specialized in precision metal spinning—the exact process that makes venturi valves superior. We didn’t diversify into ventilation components; ventilation components are where our core expertise shines.

This heritage means:

• Decades of understanding how metal spinning creates optimal valve geometry
• Established processes and quality standards refined over generations
• Direct experience with how venturi valves perform in the field
• Proven reliability with customers across labs, hospitals, and critical manufacturing

State-of-the-Art CNC Technology

Our modern CNC metal spinning equipment combines traditional craftsmanship with advanced automation:

• Precision control of every dimension
• Repeatable, consistent results across production runs
• Rapid setup and changeover for custom specifications
• No welding defects or inconsistencies that plague traditional fabrication

Engineering Partnership, Not Just Manufacturing

When you order from Metal Craft, you get:

• Direct engineering support: Discuss your application requirements and optimize your design
• Design flexibility: Modify specifications without tooling penalties or extended lead times
• Application expertise: Guidance on material selection, pressure calibration, and sizing
• Quick turnaround: From drawing to production to delivery—faster than traditional manufacturers

Material Flexibility

We maintain inventory of aluminum, stainless steel, and carbon steel—ready for your custom specifications. No waiting for material sourcing. No minimum order quantities. Your specifications, your timeline.

Local Manufacturing + North American Service

We have locations in both the United States and Canada in order to serve you. Your venturi valves won’t cross an ocean.

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How Metal Spinning Creates Superior Venturi Valves

Most manufacturers don’t explain their process. Here’s why ours matters.

What Is Metal Spinning?

Metal spinning is a forming process dating back centuries—refined with modern CNC technology. A flat disc of material is mounted on a spinning lathe and rotated at high speed. Precision tools apply pressure to gradually form the metal into the desired shape—in this case, a perfect venturi valve.

Why Metal Spinning Beats Welding For Venturi Valves

Welded Multi-Part Construction (how competitors typically make them):

• Multiple components are machined separately
• Parts are welded together to create the assembly
• Welding creates heat-affected zones and potential stress points
• Weld lines create minor internal surface irregularities
• Requires inspection and rework if welding defects occur
• Risk of leak paths at weld joints

Metal Spinning Construction (Metal Craft’s approach):

• Single piece of material is gradually formed into shape
• No welding means no heat-affected zones or stress points
• Seamless internal geometry with smooth cone surface
• Consistent material properties throughout (no welds to inspect)
• Superior internal surface finish improves fluid dynamics
• Stronger overall structure with no joint weak points

The Result: Better Venturi Valves

• Precision: Seamless internal design delivers consistent, accurate airflow regulation
• Durability: One-piece construction eliminates failure points
• Performance: Smooth internal surfaces and optimal cone geometry = superior response
• Reliability: No welding defects means predictable operation in critical environments
• Cost Efficiency: One-piece construction costs less than multi-part assemblies
• Speed: Custom specifications require no tooling, so we deliver faster

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Applications by Industry

HVAC Systems & Building Ventilation

The Problem: Traditional VAV boxes create signal delays and require frequent maintenance, reducing efficiency and responsiveness.

The Venturi Solution: Independent pressure regulation provides real-time airflow control without central system communication. Factory-calibrated for your specific pressure requirements.

Metal Craft Advantage: Custom sizing and pressure calibration optimized for your building’s exact specifications.

Laboratories & Research Facilities

The Problem: Fume hoods and lab ventilation must maintain precise capture velocity regardless of building pressurization changes. Any delay in response risks chemical vapor exposure.

The Venturi Solution: Constant volume venturi valves maintain steady capture velocity automatically, even as building pressure fluctuates. No reliance on HVAC control signals.

Metal Craft Advantage: Custom valve sizing matches your specific fume hood CFM requirements. Stainless steel options for chemical resistance.

Biological Safety Cabinets

The Problem: BSC containment depends on precise airflow. Inadequate response time to pressure changes risks compromised safety.

The Venturi Solution: Immediate, independent pressure response ensures consistent containment airflow without sensor delays.

Metal Craft Advantage: Precision manufacturing ensures reliable, repeatable performance across multiple cabinets.

Pharmaceutical Manufacturing

The Problem: Cleanroom compliance requires documented, predictable airflow control. Traditional VAV systems create maintenance records and variability.

The Venturi Solution: Factory-calibrated, independent operation provides consistent, documented performance with minimal maintenance.

Metal Craft Advantage: Full traceability and dimensional documentation for regulatory compliance. Stainless steel construction suitable for washdown environments.

Healthcare Facilities

The Problem: Isolation rooms, operating rooms, and respiratory therapy areas need reliable, responsive airflow control. Any delay in pressure adjustment risks patient safety.

The Venturi Solution: Independent, real-time airflow regulation responds immediately to demand changes without control system signals.

Metal Craft Advantage: Custom calibration for hospital-specific pressure requirements. Proven reliability in healthcare applications.

Manufacturing & Industrial Ventilation

The Problem: Process control areas, hazardous material handling, and particulate containment require consistent negative pressure. Sensor drift and signal delays compromise safety.

The Venturi Solution: Independent pressure measurement maintains consistent containment airflow regardless of system variations.

Metal Craft Advantage: Heavy-duty carbon steel and stainless steel options for industrial environments. Custom sizing for specific CFM and pressure requirements.