The constant air volume valve is a self-powered mechanical device designed for ventilation and air conditioning systems that require consistent airflow. Unlike traditional valves, it doesn't need external power to function. Instead, it uses the force of the air moving through the duct to adjust and maintain a set flow rate across a wide range of pressure differences. This makes it ideal for applications where precise control is needed without electrical intervention. In fresh air systems, especially in hotels, office buildings, and other commercial spaces, maintaining equal airflow across multiple branches can be challenging. Typically, designers install flow control valves on each branch, but this method often lacks accuracy and requires extensive manual adjustments. Since the airflow per room is usually small—around 100 m³/h—it's difficult to achieve balanced distribution using conventional methods. To solve this, adding a constant air volume valve to each branch ensures accurate and stable airflow without the need for time-consuming balancing procedures. Many people living or working in high-rise buildings are concerned about poor indoor air quality. While design standards may suggest sufficient fresh air, the real challenge lies in ensuring actual performance. The use of fixed air volume valves in fresh air systems addresses this issue effectively. However, these valves are often imported and expensive, making them more suitable for high-end buildings such as four- and five-star hotels rather than general office spaces. In exhaust systems, proper balance between supply and exhaust air is essential, yet it's often overlooked. In high-rise buildings, where the building envelope is tightly sealed, maintaining positive pressure is crucial. Most of the fresh air must be exhausted through organized systems to keep the air balance. If not properly managed, the system cannot deliver the required fresh air into the rooms. In many cases, bathrooms rely on individual ventilators, which are often left running continuously. This leads to noise issues and unnecessary energy consumption. A better solution is to remove these ventilators and install fixed air volume valves on each exhaust branch. A single exhaust fan at the top of the shaft can then manage the airflow efficiently, reducing noise and maintenance efforts while ensuring even distribution. In variable air volume (VAV) systems, the outer zones typically operate with variable airflow, while inner zones require constant airflow. For the inner zones, fixed air volume valves play a key role in maintaining consistent flow, ensuring comfort and efficiency. In cleanrooms or specialized environments, maintaining positive pressure is critical. Fixed air volume valves help regulate airflow in both supply and exhaust systems, ensuring that the desired pressure levels are consistently maintained. In operating rooms, for example, a dual-position constant air volume valve may be used to ensure proper fresh air supply during and after procedures. In duct balancing, resistance variations between branches can cause uneven airflow. Traditional dampers are often used, but they can be imprecise. Adding fixed air volume valves in key areas reduces the need for manual adjustments and improves overall system performance. Fixed air volume valves are mechanical and do not require electricity. They can be equipped with electric actuators for remote adjustment. These valves work within a temperature range of 10–50°C and a pressure differential of 50–1000 Pa. Proper installation is important: the valve should be installed horizontally, with a straight inlet section of 1.5 times the valve’s longest side and an outlet section of 0.5 times. They offer high precision, with an accuracy of ±4%, and require minimal maintenance. Available in various types, including rectangular, circular, and silencing models, they are becoming increasingly popular due to their reliability and ease of use. Just like balancing valves have become standard in water systems, constant air volume valves are now widely adopted in air supply and exhaust systems for their accuracy and automatic balancing capabilities.

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