VAV Butterfly Valve Variable Air Volume Damper Controll Ducting Airflow

Product description:

A VAV system is a dynamic HVAC solution that regulates airflow to individual zones based on real-time temperature demands. Through an integrated damper, actuator, and controller, it adjusts air volume precisely, ensuring optimal comfort while significantly reducing energy consumption.

Product parameters:

Operating pressure range:	50 - 1000 Pa
Power supply:	24V/220V (low power consumption)
Control accuracy:	less than 5%
Reaction time	less than 3S
Working temperature	10°C to 50°C
Valve body material	galvanized steel, carbon steel+spray coating, stainless steel
Actuator	Belimo brand
Installation orientation：	Can be installed horizontally or vertically
Action way	Receiving 0-10V control signals or MODBUS communication protocol
* Pressure-independent * U-shaped pressure measuring tube, stable structure without rotation, to give more accurate measurement. * Multi-leaf opposed blades in aerofoil shape, aluminium alloy, no deformation, low resistance. * Receive indoor pressure difference signal and automatically adjust indoor pressure difference. * Interlocking door magnetic switch, locking the air supply/exhaust volume. * Collect room temperature and humidity data then transmit it to third-party devices. * Can be debugged and set up in the factory, to save installation time on project site. * Can be debugged and set up can be done on project site within the full scale range.

Product Details

Specifications

Regular Options:

*Width Height (mm)**	Length (mm)	Airflow Volume (m³/h)	*Width Height (mm)**	Length (mm)	Airflow Volume (m³/h)
200*100	400	162-774	400*400	400	1170-5868
300*100	400	234-1152	500*400	400	1476-7344
400*100	400	306-1530	600*400	400	1764-8820
500*100	400	378-1926	700*400	400	2052-10260
600*100	400	468-2340	800*400	400	2340-11170
200*200	400	306-1494	900*400	400	2646-13212
300*200	400	450-2232	1000*400	400	2952-14760
400*200	400	594-2970	500*500	400	1836-9144
500*200	400	738-3729	600*500	400	2196-10980
600*200	400	900-4500	700*500	400	2556-12780
700*200	400	1044-5220	800*500	400	2916-14580
800*200	400	1188-5940	900*500	400	3294-16452
300*300	400	666-3312	1000*500	400	3672-18360
400*300	400	882-4428	600*600	400	2628-13140
500*300	400	1098-5526	800*600	400	3492-17460
600*300	400	1332-6660	1000*600	400	4392-21960
700*300	400	1548-7740	800*800	400	4680-23400
800*300	400	1764-8820	1000*800	400	5832-29160
900*300	400	1998-9972	1000*1000	400	7272-36360
1000*300	400	2234-11160

Product features

VAV rectangle valve Used for Cleanroom HVAC & Ventilation System

** Product Features

The VAV Butterfly Valve is a compact and efficient actuator-controlled damper designed for precise airflow modulation in Variable Air Volume systems. Its key product features include:

1. **Compact & Low-Cost Design:** The simple butterfly disc mechanism within a round or rectangular housing offers a space-saving and economical solution for basic airflow control applications.
2. **Modulating Control:** Integrated with an electric or pneumatic actuator, it provides proportional modulation of airflow in response to zone demand signals from a thermostat or building controller.
3. **Pressure-Independent Operation (Advanced Models):** Equipped with an integral airflow sensor and logic controller, it automatically adjusts the damper position to maintain the commanded airflow rate, compensating for upstream pressure fluctuations to ensure stable performance.
4. **Low Leakage:** Quality units feature resilient seals around the disc edge, providing tight shut-off in the closed position, which is critical for energy efficiency and system balancing.
5. **Easy Installation & Maintenance:** Its simple, robust mechanical design allows for straightforward installation in ductwork, with minimal maintenance requirements under normal operating conditions.

In summary, the VAV Butterfly Valve is valued for its "simplicity, cost-effectiveness, and reliable modulating control", making it a fundamental component for efficient zone-level air distribution in commercial HVAC systems.

Suitable for modern buildings with diverse space usage, it supports seamless integration with building automation systems for intelligent, responsive climate control.

** Working Principle

A VAV (Variable Air Volume) butterfly valve is a key control device used in air-handling systems to regulate airflow. Its operation is based on the simple yet effective principle of a rotating disc within the ductwork.

The valve consists of a circular disc mounted on a central shaft inside a cylindrical body. This shaft is connected to an external actuator. The actuator receives a control signal from a system controller (like a thermostat or Building Automation System). This signal commands the actuator to rotate the shaft, which in turn pivots the disc.

The working principle is as follows:
*   In the fully open position (typically at a 0° angle relative to the airflow), the disc aligns parallel to the duct, offering minimal resistance and allowing maximum airflow.
*   As the valve modulates, the actuator rotates the shaft, angling the disc. This angled disc acts as an obstruction, progressively reducing the open cross-sectional area of the duct.
*   In the nearly closed position (approaching 90°), the disc is perpendicular to the flow, severely restricting or shutting off the passage of air.

In advanced "pressure-independent" VAV systems, an integrated airflow sensor provides constant feedback to the actuator's controller. This allows the valve to automatically adjust the disc position to maintain a precise, set airflow rate, compensating for any pressure changes in the main duct. This direct mechanical modulation of the duct area allows for efficient and responsive control of air volume to match space demands.

** Applications in the duct of ventilation or air-conditioning systems for below industries:

- Pharmaceutical and biotechnology facilities.

- Semi-conductor processing and manufacturing plants.

- Laboratories handling hazardous substances.

- Hospital and medical ventilation system.

- Food and beverage production areas requiring odor control.