Application of Venturi air damper and Venturi tube butterfly damper combination valve to VAV control systems of fume hoods

The Venturi air damper and Venturi tube butterfly damper combination valve are commonly used as airflow volume control devices in laboratory ventilation systems, and are widely used in variable air volume (VAV) control systems of various types of fume hoods and controlled environmental pressure control systems. Based on the airflow characteristics, pressure independence, turndown ratio, control accuracy, response time and anti-corrosion technology, the performance of the two kinds of valves and their application to VAV control system of the fume hood are studied. The application characteristics and application range of the two kinds of valves in VAV control system of the fume hood are obtained.