The Venturi airflow control valve combines a mechanical, pressure-independent regulating valve with a high-speed position/airflow controller to meet the unique needs of airflow control. Through aerodynamic design, the valve has a quiet working performance. Quick response automatic pressure balance device. Provide reliable fume hood dust collection and indoor pressure control, and the air volume control is not affected by the fluctuation of the ventilation system.

Valves are classified into applications such as Constant Air Volume(CAV) control, bistable control or Variable Air Volume(VAV) control. In the design, the airflow should be maximized and the related noise should be reduced.

PRODUCT INFORMATION

① Door height sensor

② Area presence sensor (Optional*)

③ Differential pressure sensor

④ Fume hood control box

⑤ Fume hood controller

⑥ Venturi Valve (VAV)

SPECIFICATION

The new generation of stainless steel Venturi valve has changed the traditional air volume control mode, adding flow, pressure, measurement and control to the original imported Venturi valve. For high-precision and low-pressure applications, the original imported and domestic Venturi valves using spring adjustment cannot meet the requirements of use. Because the spool is at low pressure, the spring cannot sense pressure changes. The new generation of flow control type Venturi internal Imported ultra-high-precision controlled, the valve pressure loss is smaller, and the system accuracy and stability are increased Performance, bringing the system to a higher level, saving energy and reducing emissions.

In terms of material, SS304 stainless steel with better performance is used for main structural parts such as valve body, valve core, bracket, etc.; therefore, it has better indicators of corrosion resistance, material stability, mechanical strength, etc., especially suitable for clean environment Air supply/exhaust system and P3/P4 laboratory; more stringent requirements for corrosion resistance, material stability, mechanical strength, and gas leakage.

FEATURES

* Pressure-independent operation: self-adjusting mechanical components, the air volume has nothing to do with the pressure change in the pipeline

* Fast response speed: the response time is less than 1 second

* High control accuracy: air volume control accuracy ≤±5% (within the range)

* High adjustment ratio: up to 20:1

* Automatic window function, convenient to open the window when holding items in both hands

* Air flow control range: 60～17,000m3/h

* Air volume calibration: The air volume is accurately calibrated at 51 points in the factory

* No straight pipe section is required for the air ducts before and after the valve

* Working pressure: 150Pa～750Pa

* A variety of mode control methods, suitable for various integrated control systems

STRUCTURE

• Body: 3 options

1. Aluminum, 2.304/316 stainless steel 3. Resin polymer fiber

• Body Shaft: SUS 316 Stainless Steel + Synthetic Teflon Coated Teflon®

• Bile spring: SUS304 stainless steel

• Axle Bracket: SUS 316 Stainless Steel

• Lever: SUS 316 stainless steel

• Spool Assembly: 1060 Aluminum and Celanex3300

• Flexible sealing polyethylene insulation (optional)

PRINCIPLE

Using a pressure-independent variable air volume control system, when the height of the fume hood window changes, the system automatically calculates the required exhaust air volume value for the current window height of the fume hood, and the pressure-independent variable air volume venturi valve responds to quickly adjust the valve exhaust volume, To ensure constant wind speed on the surface of the fume hood, and control accuracy within ±5%. Each fume hood is equipped with a set of variable air volume control system to ensure that the surface wind speed of the fume hood is quickly constant at the set value under any position of the fume hood window, generally 0.5M/S; the system includes: a variable air volume venturi valve , An LCD operation panel, a Door height sensor, a differential pressure sensor, a Fume hood control box.

Controller

The fume hood controller is installed on the fume hood. It is mainly used for the measurement and control of the wind speed of the fume hood, lighting monitoring and alarming, and parameter setting. It cooperates with the Venturi valve to realize the air volume control and monitoring and alarming of the fume hood.

*Color touch screen, integrated control, display and operation

*Configurable display content, surface wind speed or air volume, etc.

* With sound and light alarm, visual alarm

*Smart search for matching local Venturi valve controllers to speed up the commissioning process

*Second-level password protects important configuration parameters

*Stopwatch/Timer function: Allows user to set reminders, take samples or end experiments

*RS485 port is connected to PC or host computer for related debugging, setting, monitoring and detection

*working environment:

Working environment temperature: 0-50℃

Storage environment temperature: -30~80℃

Working environment humidity: relative humidity 10~90% (non-condensing)

Door height sensor

The door height sensor is used to detect the position of the fume hood adjustment door. The sensor can be configured to operate with the modulating door found on most VAV fume hoods. When the door moves, the reel and potentiometer will turn and change the potentiometer output resistance value. The monitor obtains the varying regulated gate position voltage.

*Direct scroll type adjustment door sensor

*Fume hood top surface mount or use bracket mount (without bracket)

*0~10K resistance output, the output value is proportional to the adjustment gate position

*Nylon-wrapped stainless steel wire connected to ten-turn precision potentiometer, available in two detection lengths:

*Standard: Maximum wire retraction length is 1050mm

*Long type: the maximum retraction length of the steel wire is 2540mm

*size:

Standard detection length: height 52 width 51 length 64mm

Long detection length: height 121 width 79 length 119mm

*Working environment temperature: 0~50℃

Differential pressure sensor

Differential pressure sensor is mainly suitable for measuring the pressure difference of display gas. It is widely used in heating systems, purification and ventilation systems and other fields that have strict requirements on the accuracy and quality of environmental pressure differences, such as hospitals, laboratories, chemicals, GMP pharmaceutical factories and industrial plants.

*Air pressure range: 0*1000Pa

*Ambient relative temperature and humidity:

20℃~+85℃ 0~95%RH

Fume hood control box

Automatic door control, with pedals, panel, automatic induction, remote diversified control methods, surface wind speed control (support surface wind speed valve control, Venturi flow valve control, on-off volume valve control) fan direct contactor control lighting, socket RS-485 interface of auxiliary equipment can be connected centrally.

Monitoring with leakage protection switch

It can be installed on the top and bottom of the fume hood, with anti-pinch function. The wind speed is too high or too low, and the temperature is too high.

Direct AC220V power supply, no need to configure power modules.

Area presence sensor (Optional*)

Area presence sensors use microwaves to detect if someone is operating in front of the fume hood. When there are people, the system is in the standard state and maintains the surface wind speed of the fume hood at 0.5m/s. When there is no one, it quickly switches to the standby state, and the surface wind speed is reduced to 0.3m/s.

*Output power: AC/DC 12~30V (±10%)

*Signal output: relay, 1 pair of selectable contact points

*Temperature range: *40°C~60°C

*Weight: about 145g

*Protection level: IP54

* Quiescent current: 35mA

*Operating current: 73mA

*Self-learning time: 10s

*Response time: ≤100ms

*Operation display: standby blue LED, detection action red LED

*Maximum installation height: 2500mm

*Detection area: W2000D800mm (maximum)

W1000D800mm (minimum)

*Appearance size: L200W49H32