What to do when a fume hood meets a Venturi valve

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Keywords: Venturi valve, Venturi air valve, Intelligent room control Venturi valve, Constant-air-volume Venturi valve, Variable-air-volume Venturi supply valve, Face velocity control system, Variable-air-volume Venturi exhaust valve, Chinese Venturi variable-air-volume valve. When a fume hood meets a Venturi valve, how many reasons does the fume hood have? For fume hoods, the Venturi valve is seen as sophisticated and premium – comfortable, safe, and energy-efficient; that’s all there is to it. When there is no operator in front of the fume hood, the face velocity of the fume hood is set to 0.3 m/s; once someone is detected entering, the face velocity is quickly adjusted to 0.5 m/s. It responds quickly to commands, reaching the upper atmosphere of the venturi valve within 1 second; it is safe, comfortable, and energy-efficient, and is often used in laboratories. It responds quickly to actions, with a response time of within 1 second. Zhuhai Haoxing Automation System Co., Ltd. is a company specialized in providing solutions and services for ventilation and cleanroom control systems in operating rooms and laboratories. The Venturi variable air volume valve is a air volume control device with high precision and rapid response. 　　It can play a significant role in fields that require precise control of air flow, such as chemical laboratories, physical and analytical laboratories, biosafety laboratories or cleanrooms, animal housing facilities, hospitals, and more. It has little effect. It features a self-regulating mechanical structure that remains unaffected by changes in the static pressure within the pipeline and can precisely maintain the set air volume, enabling rapid control in response to changes in the required air volume. Safety assurance for laboratory personnel: Precise face velocity control. To ensure the safety of laboratory personnel, experiments are generally conducted in fume hoods; therefore, to prevent toxic gases from escaping from within the fume hood, it is necessary to precisely control the face velocity at the window. Technical requirements for laboratory ventilation and exhaust: 1. Technical assurance – Ensure the correct airflow direction within the laboratory building, from the offices to the corridors, and then to the laboratories. A slight negative pressure is maintained in all laboratory rooms ； Fresh air supply can be automatically adjusted to match changes in the amount of exhaust air inside the room ； It can also perform automatic adjustment by adjusting the exhaust volume of the fume hood according to different opening degrees of the control valves, in order to maintain a constant face velocity ； The exhaust volume of each unit should be able to adjust automatically in response to changes in the exhaust volume of the fume hood. 2. System control objective: Maintain the face velocity of the fume hood at 0.5±0.1 m/s, ensuring that a constant safe face velocity is preserved at any position below 0–0.55 meters from the fume hood’s viewing window, thus preventing the escape of harmful gases. Maintain a constant exhaust flow rate for the exhaust hood. Control the airflow direction in the laboratory at a slight negative pressure of -10 Pa. Ø Sensors in the area: Automatically detect whether there is someone present or not, thereby determining the average face velocity required by the user (set at 0.5 M/S when someone is working, and 0.3 M/S when no one is working). Ø Door height sensor: Monitors the current height of the viewing window in real time, and calculates the required exhaust volume accordingly. Ø Variable-volume venturi valve: Provides rapid response, achieving the desired exhaust volume within 1 second to meet the user’s needs. Ø Fume hood control panel: Monitors the operating status in real time, as well as the actual exhaust volume and face velocity values ； Start/stop system, linked to exhaust fan ； It has an emergency exhaust function; when activated, the air valve opens to its maximum position to allow maximum airflow for exhaust ； The surface wind speed value can be set ； Alarm: System air volume too low ； Door height out-of-limit alarm ； Low face wind speed alarm ； Ø The system features open communication interfaces, allowing it to be integrated with room control systems or other building management systems. The HCS Venturi variable air volume damper series offers high precision and rapid response times