Cleanroom Air Distribution Systems

Venturi Airflow Control Valve

A characterized stainless Venturi valve whose spring-compensated cone preserves the commanded airflow as duct static pressure varies.

Pressure-Independent Flow Response
Spring-Compensated Venturi Cone
Fast Commanded Repositioning
Corrosion-Resistant Air Path

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Product Introduction

The Venturi airflow control valve uses a shaped throat and movable cone to create a repeatable relationship between cone position and airflow. A mechanical spring shifts the cone in response to duct-pressure change, while the actuator establishes the opening required by the control command. Because pressure compensation occurs inside the valve body, the controller can respond without continuously deriving airflow from a separate duct sensor. Stainless wetted components and an external actuator make the assembly suitable for supply, general exhaust and laboratory exhaust duties.

Key Features

A calibrated Venturi throat and cone produce a stable position-to-airflow characteristic over the operating range.

Mechanical spring compensation reacts directly to static-pressure variation before the room-pressure loop drifts.

A fast external actuator supports fume-hood tracking and rapid room supply-to-exhaust balance changes.

Smooth stainless internal surfaces and external drive components reduce residue traps in demanding exhaust service.

Customer Product Concerns

Critical-room airflow control must remain repeatable through duct-pressure swings, react quickly to demand and tolerate contaminants without a drifting measurement element.

A fan-speed change alters several branch flows before the room pressure loop can recover.The spring-loaded cone compensates mechanically for the duct-pressure change at each valve.

Fume-hood sash movement requires a large exhaust change within seconds.A characterized cone and fast actuator move directly to the airflow position commanded by the hood controller.

Dust or chemical residue blocks small pressure-sensor ports in an exhaust branch.The pressure-independent cone mechanism controls flow without small in-stream averaging taps.

Mismatched supply and exhaust response reverses the intended room pressure direction.Coordinated valve commands and known flow-position curves maintain the scheduled offset between room air paths.

Typical Applications

Pharmaceutical room pressure controlLaboratory fume-hood exhaustCleanroom supply and return trackingAnimal research ventilationHealthcare isolation-room airflow

Technical Parameters

Representative construction ranges for a stainless Venturi airflow control valve are shown below.

Core Material	304 or 316 stainless-steel Venturi body with spring-compensated cone and stainless linkage
Panel Thickness	1.0–1.5 mm formed Venturi body wall
Effective Width	152–356 mm nominal round duct diameter
Maximum Length	Up to 1200 mm overall body length including transition sections
Steel Facing Thickness	1.2–2.0 mm stainless mounting flange and actuator support plates
Core Density	Approximately 8000 kg/m³ for 304 or 316 stainless-steel airflow components
Thermal Conductivity	14–16 W/(m·K) through the 304 or 316 stainless Venturi body at room temperature
Surface Finish	Smooth mill-finish or passivated stainless air path with protected external actuator
Joint Type	Round flanged or slip-fit Venturi body with guided cone shaft and external direct-coupled linkage
Customization	Available based on the intended application and operating environment.

Available Options

Constant-volume or variable-volume controlSupply, general exhaust or coated corrosive-exhaust constructionAnalog or BACnet-compatible controllerFail-safe actuator and position feedback

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