Venturi Air Valve
$0.00
EB Air Control, a trusted venturi air valve (VAV) manufacturer and supplier, offers pressure-independent venturi air valves designed to maintain constant or variable airflow. By monitoring external duct conditions, the valve delivers the precise airflow required for critical environments. Widely used in laboratories and research facilities, it helps maintain high air-change rates and accurate room pressurization. Operating as both a laboratory VAV air valve and a CAV air valve, it accepts I/O signals, data communication protocols from building management systems (BMS), and feedback loop inputs, enabling reliable performance in both constant-volume and variable-volume applications.
Need Help Selecting the Right Venturi Air Valve for Your Facility?
Every lab layout is different, and the right valve size, pressure range, and control setup depend on your specific duct conditions. Get in touch with the EB Air Control team for a recommendation, or download the brochure below for full specifications.
APPLICATION
Our venturi air valve is generally used in laboratories, research centers, biosafety cabinets, and other critical environments where precise maintenance of pressure, temperature, and airflow keeps the room or unit well-calibrated. As a laboratory venturi valve, it is built to be highly sensitive, reacting within a fraction of a second to the external control signal applied to it, which makes it dependable in fast-changing lab conditions.
This laboratory air valve has become a standard part of modern lab design. As facility requirements get more advanced, this air valve for lab pressurization is expected to operate on its own and communicate directly with a Building Management System (BMS). It is available in four sizes, 6, 8, 10, and 12 inches, along with additional fittings such as re-heat transitions and an optional silencer. At present, EB Air offers this vav air valve for low- to mid-range pressure systems, in the 0.3 to 3 inch w.g. range.
The EB venturi air valve is also commonly selected for CAV applications within larger laboratory ventilation systems. As a true CAV air valve, it holds constant airflow in critical parts of a Constant Air Volume system through its pressure-dependent capability, while actuators and controllers can be programmed to hold a required operating setpoint. In general use, this VAV venturi air valve can also be factory-calibrated for a fixed setpoint airflow by locking the valve in position. Holding that calibrated position lets the EB venturi laboratory air control valve maintain a constant flow through minor pressure fluctuations, which is why it works well as a critical room venturi valve in sensitive spaces.
By pairing the Belimo NMQ24A-VST actuator with the VRU Universal Modular Controller, the valve can communicate directly with the BMS through MODBUS or BACNET. This gives real-time control over room pressurization, with the valve continuously adjusting to hold the required airflow at any given duct pressure. With EB Air’s Venturi Valves, the goal stays simple: a dependable device that connects, communicates, and holds accurate flow under changing operating conditions.
KEY FEATURES
Why Choose the EB Venturi Air Valve
- Mechanically pressure-independent, so it responds to duct pressure changes on its own, without waiting on a BMS signal
- Holds airflow within a tight accuracy range, typically within plus or minus 5 percent
- Works as a laboratory VAV air valve or a CAV air valve, depending on how the system is set up
- Integrates with building automation systems through MODBUS or BACNET, using the Belimo NMQ24A-VST actuator and VRU controller
- Field-adjustable and straightforward to install in new or retrofit duct runs
- Available in 6, 8, 10, and 12 inch sizes, for pressure ranges from 0.3 to 3 inch w.g.
- Optional re-heat transitions and silencer for added flexibility in laboratory ventilation systems
WORKS
How Does a Venturi Air Valve Work?
A venturi air valve is built around a tube with a narrow, hourglass-shaped section in the middle. Inside that narrow section sits a spring-loaded cone that moves forward and backward, in line with the airflow, as static duct pressure changes. When pressure rises or drops, the cone shifts position right away to adjust the opening, so the valve keeps airflow within a tight accuracy band without needing a signal from the building automation system first.
This is the main difference between a pressure-independent air valve and a standard damper-based VAV box. A conventional VAV box has to measure airflow, send that reading to the BMS, wait for a signal back, and only then move the damper. That takes time. A laboratory venturi air valve skips most of that lag because it corrects itself mechanically and continuously, which matters in spaces where even a short pressure imbalance can affect containment or safety.
This is also one reason venturi valves are often preferred over traditional VAV boxes for fume hood exhaust, biosafety cabinets, and other applications where room pressure relationships need to stay tight at all times.
SPECIFICATIONS
| Specification | Detail |
| Valve type | Venturi air valve, mechanically pressure-independent |
| Operation modes | Constant Air Volume (CAV) and Variable Air Volume (VAV) |
| Available sizes | 6″, 8″, 10″, 12″ |
| Pressure range | 0.3″ to 3″ w.g. |
| Flow accuracy | Within approximately ±5% |
| Actuator | Belimo NMQ24A-VST |
| Controller | VRU Universal Modular Controller |
| Communication protocol | MODBUS, BACNET |
| Optional accessories | Re-heat transition, silencer |
| Typical applications | Laboratories, research centers, biosafety cabinets, critical rooms |
Venturi Valve vs Traditional VAV Box
A traditional VAV box relies on a damper, an airflow sensor, and a control loop through the BMS. When duct pressure changes, the sensor has to detect it, send that data to the controller, and wait for a command before the damper moves. In a lab setting, that delay can be enough to disturb room pressure relationships for a few seconds at a time.
A venturi air valve removes most of that dependency. Because the cone and spring assembly respond to pressure changes directly, the valve does not need to wait on a signal to start correcting airflow. This gives labs a wider, more stable operating range, better turndown, and fewer pressure swings between occupied and unoccupied states. It is one of the main reasons venturi valves have become the standard choice over older VAV boxes in laboratories, hospitals, and other spaces where airborne containment matters.
DIMENSIONS
BROCHURE
Venturi Air Valve Brochure Download PDF
EB Air Control Corporate Brochure Download PDF
VAV Product Description
INSTALLATION LIST
FAQs
Q1. What is a venturi valve?
A venturi valve is an airflow control device built around a narrow, hourglass-shaped section in the duct, with a spring-loaded cone inside that moves in response to changes in duct pressure. This mechanical action lets it regulate airflow on its own, without waiting for a signal from the building management system, which is why it is widely used as a laboratory venturi air valve in labs, biosafety cabinets, and other critical rooms.
Q2. What is a venturi air valve used for?
A venturi air valve controls and maintains precise airflow in laboratories, research facilities, biosafety cabinets, and other critical environments where accurate room pressurization is required.
Q3. What is the difference between a CAV air valve and a VAV air valve?
A CAV air valve delivers a fixed, constant volume of airflow. A VAV air valve adjusts airflow based on real-time conditions such as occupancy, temperature, or pressure demand.
Q4. Why is a pressure-independent air valve important for labs?
A pressure-independent air valve adjusts to duct pressure changes mechanically, without waiting on a signal from the BMS. This helps laboratory ventilation systems keep a safe, stable pressure relationship between critical and adjacent spaces.
Q5. What sizes does EB Air’s venturi air valve come in?
It is available in 6, 8, 10, and 12 inch sizes, with optional fittings such as re-heat transitions and silencers, for low to mid-range pressure systems between 0.3 and 3 inch w.g.
Q6. Can the venturi air valve integrate with my existing BMS?
Yes. Using the Belimo NMQ24A-VST actuator and VRU Universal Modular Controller, the venturi laboratory air control valve communicates directly through MODBUS or BACNET.
Q7. How is a venturi valve different from a standard VAV box?
A venturi valve responds to duct pressure changes on its own through a mechanical cone and spring assembly, while a standard VAV box relies on a sensor and a control signal from the BMS before it can adjust, which adds a delay.
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