Air duct dampers are an essential component of an HVAC system that regulates the flow of air within the system. They are used to adjust airflow, control temperature, and provide energy efficiency in heating, ventilation, and air conditioning systems. Air duct damper valves are typically made of steel or aluminum and consist of a blade or plate that moves within the ductwork to adjust the airflow.
Maintaining air duct damper valves is crucial for ensuring that your HVAC system operates efficiently and effectively. Regular maintenance helps to prevent issues such as duct leakage, energy loss, and decreased indoor air quality.
How to maintain the air duct damper valve:
Clean the damper blades
Dirt, dust, and debris can accumulate on the damper blades, making them less effective. Regularly cleaning the blades will help to ensure that they move freely within the ductwork. Use a soft brush or a vacuum cleaner to remove any debris that has accumulated on the blades.
Lubricate the damper blades
Applying a lubricant to the damper blades will help to ensure that they move smoothly and do not get stuck. Be sure to use a lubricant that is compatible with the material of the damper blades. Do not use petroleum-based lubricants, as they can cause damage to the damper blades.
Check for damage
Inspect the damper blades for signs of damage, such as cracks or bends. If you notice any damage, replace the damper immediately. Damaged dampers can cause air leakage, which can lead to decreased energy efficiency and decreased indoor air quality.
Check the damper linkage
The damper linkage connects the damper blade to the actuator or hand wheel that controls the damper. Check the linkage for signs of wear or damage, and replace any damaged parts. A damaged linkage can prevent the damper from opening or closing properly, which can lead to decreased energy efficiency and decreased indoor air quality.
Test the damper operation
Periodically test the damper operation to ensure that it is working properly. This can be done by adjusting the damper and checking the airflow through the ductwork. If the airflow is not adjusted as expected, check the damper for damage or obstructions.
Keep the damper area clean
Make sure the area around the damper is kept clean and free of debris. This will help to ensure that the damper operates smoothly and does not get stuck.
Replace the damper as needed
Air duct damper valves have a lifespan of around 10 to 15 years. If your damper is older than this, it may be time to replace it. Replacement dampers should be sized correctly for your ductwork and should be compatible with your HVAC system.
In conclusion, maintaining air duct damper valves is crucial for ensuring that your HVAC system operates efficiently and effectively. Regular maintenance, including cleaning, lubricating, inspecting, testing, and replacing dampers as needed, will help to prevent issues such as duct leakage, energy loss, and decreased indoor air quality. By following these tips, you can ensure that your HVAC system operates smoothly and efficiently for years to come.
Damper for air duct are an essential component of any HVAC system and are used to regulate airflow within the duct. It is a valve that can be opened or closed to control air flow, ensuring that the temperature and pressure within the pipe remain stable and within the desired range. Dampers can also help reduce noise levels and improve energy efficiency by minimizing air leakage.
Precautions for purchasing damper for air duct
There are various types of dampers available for use with air ducts, including manual, electric, and automatic dampers. Manual air duct dampers are the simplest type and are manually operated by adjusting a lever or knob. Electric air duct dampers, on the other hand, use a motor to automatically open and close the dampers, while automatic air duct dampers are equipped with sensors that detect changes in temperature, humidity, or pressure and adjust airflow accordingly.
The material used to make the damper for air duct is also an important consideration as it affects the durability and efficiency of the product. Common materials include galvanized steel, aluminum, stainless steel, and plastic. Galvanized steel is a popular choice for its durability and resistance to rust and corrosion. Aluminum is light and easy to machine, making it the first choice for small pipes. Stainless steel is a high-quality material with excellent corrosion resistance and extreme temperature resistance, which is very suitable for use in harsh environments. The plastic material is lightweight and can be injection molded. It is the most cost-effective air duct damper product on the market, but Plastic dampers cannot be used in high temperature environments.
When selecting a damper for air duct, several factors need to be considered, such as duct size, airflow requirements, and desired level of control. The damper should be sized to match the size of the duct and the airflow rating should be sufficient to handle the required airflow. The level of control required will depend on the application, with manual dampers suitable for simple systems and automatic or electric dampers more suitable for complex systems.
An important consideration when selecting a damper is the air leakage rate, which affects the energy efficiency of the HVAC system. Air leaks occur when the damper seals poorly, allowing air to escape or enter the duct. This leads to increased energy consumption and reduced comfort. To minimize air leakage, it is important to choose a damper designed for a tight seal with a low leakage rate.
Another consideration is noise levels, as some dampers can create unwanted noise when they are on or off. This is especially problematic in a residential or office environment, where too much noise can be distracting. To minimize noise, it is important to choose a damper with a quiet motor or one designed for smooth operation.
In addition to regulating airflow and improving energy efficiency, dampers can play a vital role in ensuring indoor air quality. By regulating air flow, dampers prevent pollutants, allergens, and other pollutants from spreading throughout a building. This is especially important in healthcare facilities, where clean air is critical to patient health.
In conclusion, damper for air duct are an important part of any HVAC system, providing basic control over airflow, temperature and pressure. By choosing the right damper for your application, you can increase energy efficiency, reduce noise and ensure optimal indoor air quality. With a range of available materials, sizes and control options, there is a damper to suit every application, from simple residential systems to complex commercial environments.
An air damper valve is a mechanical device used to control the flow of air in an HVAC (heating, ventilation, and air conditioning) system. The materials used to make air dampers can vary depending on the specific application and environmental factors, but some common materials include:
Stainless steel: Stainless steel is a commonly used material in air damper valves because it is durable, strong and able to withstand high temperatures, but the manufacturing process is complicated and the manufacturing cost is high. It is usually used in high-end office buildings and high-temperature and high-pressure ventilation systems.
Aluminum: Aluminum is another popular material used in air dampers because it is lightweight, corrosion resistant, easy to work with and less expensive to make. However, the aluminum air damper valve has poor anti-corrosion performance and is easily corroded in a high acid-base environment, so it is not suitable for corrosive gases.
Plastic: Some air damper are made of plastic, such as PVC or PP, because it is lightweight, cheap, and corrosion-resistant, PP air damper valve can be injection molded in regular sizes and have good sealing performance, and larger sizes can be processed and customized. Due to the low production cost, it has high cost performance. However, the plastic material is not resistant to high temperature and cannot be used in a high temperature environment.
Rubber: Some air damper use rubber to create a tight seal and prevent air from leaking through the valve.
The advantages of using air damper valve in HVAC systems include:
Improved Energy Efficiency: Air damper valve help regulate air flow in HVAC systems, increasing energy efficiency and reducing energy costs.
Improved Air Quality: By controlling air flow, damper valves help maintain optimal air quality in a building or space.
Enhanced comfort: Air damper valve help distribute air evenly throughout the space, increasing comfort and reducing hot or cold spots.
Reduce Noise: Air damper valve can help reduce noise in HVAC systems by regulating airflow and minimizing turbulence.
In conclusion, air damper valve are an important part of HVAC systems and the materials from which they are made can be selected according to specific application requirements. Before purchasing an air damping valve, it is recommended to communicate and negotiate with technicians or damping valve suppliers to determine the material, size, control type, etc. of the air damping valve.
VAV variable air volume butterfly valve is an air-conditioning system that controls the temperature of an air-conditioned area by changing the air supply volume and also adjusting the air supply temperature. The system adjusts the air volume sent into the room through the variable air volume terminal device, and adjusts the air volume of the air conditioner accordingly to adapt to the air volume demand of the system.
The variable air volume butterfly valve can automatically adjust the air supply air volume of the air conditioner (adjust the air supply temperature when the air volume reaches a small amount) according to the change of the air conditioning load and the change of the indoor required parameters to meet the comfort requirements of the indoor personnel or other process requirements. At the same time, the speed of the blower is automatically adjusted according to the actual air supply volume, which reduces the power of the blower to a greater extent and saves energy.
VAV variable air volume butterfly valve contains the following components:
Controller (equivalent to the brain), angle actuator, linear stroke actuator, displacement sensor, electric door motor, anti-pinch infrared sensor, personnel area detector, foot switch, flow sensor, face wind speed sensor, temperature sensor, LCD display operation panel, lighting and other components.
Butterfly valve (mainly composed of valve body, valve stem, butterfly plate and sealing ring) is a simple regulating valve, and it can also be used for on-off control of low-pressure pipeline media. Ventilation butterfly valve is a non-closed butterfly valve. Ventilation butterfly valves are used in dusty cold air or hot air gas pipelines of ventilation and environmental protection projects in chemical, building materials, power stations, glass and other industries, as a gas medium to adjust the flow (unit: cubic meters per second) or cut off the pipeline control device. This type of valve should generally be installed horizontally in the pipeline.
Structural characteristics of vav variable air volume butterfly valve:
1. It is designed and manufactured by adopting a new structural form of welding of center-line disc plate and short structure steel plate, compact structure, light weight, easy to install, small flow resistance, large circulation, avoiding the influence of high temperature expansion, and easy to operate
2. There are no connecting rods, bolts, etc. in the air volume regulating valve, which is reliable in operation and long in service life. It can be installed in multiple positions, and is not affected by the flow of the medium. There are no connecting rods, bolts, etc., so it works reliably and has a long service life. It can be installed in multiple positions, and is not affected by the flow of the medium.
The company has always paid attention to product research and development, has a research and development team of more than 20 people, and has established long-term cooperative relationships with universities, research institutions and large state-owned enterprises. The R&D team adopts modern design theory and design technology, has more than 20 years of technical accumulation, and continuously creates novel, reliable, and customer-friendly personalized products for the field of automatic control. At present, we are constantly improving permanent magnet motors, permanent magnet motor drives and other products, and are committed to the popularization of permanent magnet frequency conversion.
XIXHENG EP LTD specializes in the production of PP plastic pneumatic dampers. The material is PP polypropylene. It is suitable for ventilation systems with explosion-proof requirements such as chemical industry and laboratories. PP plastic pneumatic dampers are composed of plastic dampers and pneumatic actuators. The size supports customization , square or round
XICHENG ER LTD specializes in the production of PP plastic pneumatic dampers. The material is PP polypropylene, which is resistant to acid and alkali corrosion. The working principle of PP plastic pneumatic dampers is the same as that of PP electric dampers, but the electric actuator is changed to a pneumatic actuator. The third-party plate solenoid valve controls the switch of the air pipe to realize the opening and closing of the PP plastic pneumatic air valve.
PP plastic pneumatic air valve is suitable for application environments with explosion-proof requirements such as chemical plants and laboratories. It is used in PP material ventilation duct systems, and is connected to PP air ducts. It is used for exhaust control of corrosive gases, anti-corrosion and acid resistance. Alkali, PP plastic pneumatic air valve has complete specifications, and is used with PP air pipe, elbow, tee, and reducing diameter to form a complete PP ventilation pipeline system. The pneumatic actuator of PP plastic pneumatic air valve can be selected according to the specifications of the air valve. torque.
PP plastic pneumatic air valve is a kind of non-sealed butterfly valve, which is widely used in colleges and universities, chemical industry, biology, electric power, energy, environmental engineering, etc. in the production process, the medium temperature is less than or equal to 90℃, and the nominal pressure is less than 0.1Mpa. Connecting, opening and closing or adjusting the medium, it is usually installed on the top of the fume hood, the PP suction hood and the inlet of the pipeline of the one-use-one-standby spray tower to switch the exhaust gas flow direction of the spray tower.
PP plastic pneumatic air valve principle
The PP plastic pneumatic air valve is installed in the PP pipeline system, and the PP pneumatic air valve can be opened and closed according to the needs through manual operation or PLC automatic control technology. , Drive the rotation of the butterfly valve blade, achieve a 90-degree angle, achieve the purpose of opening and closing, and have a feedback indication function. Through the differential pressure detection device, after closing the air valve, the signal is transmitted to the PLC system, so as to control the PP fan inverter to reduce the speed and save energy.
PP plastic pneumatic air valve performance characteristics
PP material processing, acid and alkali corrosion resistance, strong anti-corrosion performance; PP pneumatic air valve has socket design at both ends, and can also be welded flange connection; High-strength actuator, all-copper design, switch life more than 20,000 times; The inner and outer walls are smooth and the wind resistance is small.
PP plastic pneumatic damper industry application
Workshop ventilation system Chemical fresh air system Laboratory ventilation system HVAC system
Introduction to Variable Air Volume System (VAV System)
Variable Air Volume System (VAV) The Variable Air Volume System (VAV system) was born in the United States in the 1960s. According to indoor load changes or changes in indoor required parameters, it maintains a constant supply air temperature and automatically adjusts the air supply volume of the air conditioning system, so that the indoor parameters meet the requirements. Full air air conditioning system. Since the air conditioning system operates at part load most of the time, the reduction in air volume results in a reduction in the energy consumption of the fans. The VAV system seeks to meet the requirements of the indoor air environment with less energy consumption practicality
The operating cost is low. Since the air volume decreases with the decrease of the load, the cooling capacity and fan power are close to the actual needs of the building’s air conditioning load. In the transitional season, the outdoor fresh air cooling capacity can also be utilized as much as possible.
The indoor temperature of each room can be adjusted individually, and the air volume adjustment of each room is directly controlled by the thermostat installed in the room.
It has the advantages of general low-speed central air-conditioning systems. For example, it can carry out better air filtration, noise reduction, etc., and is conducive to centralized management.
Unlike other systems, the number of indoor air changes, airflow distribution and fresh air volume can always be guaranteed. When the air volume is too low and affects the airflow distribution, the end reheating can only be used instead of further reducing the air volume.
Laboratory Airflow Control System Features
Laboratory Safety Safety is one of the most important goals of a laboratory. Laboratory safety includes two parts: ensuring the safety of operators in the laboratory and ensuring the safety of the surrounding environment of the laboratory. The surface wind speed control of the fume hood can better ensure the safety of operators in the laboratory; the ventilation and pressure control of the laboratory is an important means to ensure the surrounding environment of the laboratory. In order to ensure the safety of operators in the laboratory, we need to accurately and quickly control the airflow of various experimental equipment to ensure that the toxic and harmful gases generated in the experiment will not overflow and endanger the safety of personnel. Keep the surrounding environment safe with laboratory pressure control.
Energy saving of laboratory airflow control system Under the circumstance that energy saving and emission reduction has become an important indicator, energy saving has become a very concerned issue for laboratory managers and construction units. In general commercial buildings, the fresh air ratio is 15%, while for laboratories, in order to ensure the safety of the system, 100% fresh air is usually used, and in order to ensure the experimental conditions, sometimes the ventilation system runs continuously for 24 hours, which consumes a lot of energy (ventilation and air conditioning). The energy consumption of the system is usually 10 to 100 times that of ordinary commercial buildings). Therefore, under the premise of ensuring safety, energy consumption should be reduced as much as possible.
Operation and maintenance of the laboratory To ensure the stability of the laboratory control system, the control system must be simple and reliable. Intelligent technology airflow control system, simple and reliable working principle, stable product performance, no need for regular maintenance. In order to facilitate future management and maintenance, the laboratory control system should be able to easily integrate with the building control system, have an open network platform, and have functions such as monitoring energy usage, alarming, and safety analysis.
Flexibility of the system The design of a good control system should try to consider the user’s updatable function of the function in the future. The increase, decrease and displacement of equipment such as fume hoods during renovation and expansion, as well as the change of laboratory pressure polarity, the intelligent technology control system can be easily adjusted, and the system has good scalability.
The health and comfort of the experimental environment Ensure that the laboratory has a suitable and stable temperature and humidity, and the airflow is stable and odor-free, providing a healthy and comfortable working environment for the laboratory staff to improve work efficiency.
Laboratory Variable Air Volume Control System Program Introduction
Fume hood surface wind speed control system consists of a single fume hood surface wind speed control system including: fume hood surface wind speed controller, surface wind speed sensor, adjustment window displacement sensor, exhaust valve (with anti-corrosion coating), and unmanned sensor (optional) composition.
Using the surface wind speed sensor, the fume hood controller detects the wind speed, and uses the adjustment valve to increase or decrease the wind speed, so as to control the surface wind speed of the fume hood to maintain the specified 0.3 ~ 05m/s. In addition, when someone is operating the fume hood, in order to speed up the adjustment of the opposite wind speed, the adjustment window displacement controller can speed up the corresponding speed of the surface wind speed, thereby improving the response time of the surface wind speed.
The displacement sensor is installed on the adjustment door of the fume hood to sense the position of the adjustment window of the fume hood, calculate the opening of the fume hood, and input the potentiometer signal into the fume hood monitor. Change the position to calculate and adjust the valve according to the calculation, and do not have to wait for the wind speed sensor to detect that the wind speed is low before adjusting, so as to ensure the rapidity and accuracy of the constant surface wind speed of the fume hood.
This control scheme makes up for the shortcomings that the surface wind speed sensor alone is not fast enough to respond, and the air volume of the displacement sensor alone is not the real wind speed.
For a fume hood to accurately control the surface wind speed, the surface wind speed controller, the wind speed sensor, the displacement sensor, the regulating valve, and the corresponding power connection line are required. The manned and unmanned sensor is an optional device. With this sensor, a high surface wind speed such as 0.5m/s can be maintained when there are people in front of the fume hood, and a low 0.3m/s when no one is present, so that the It can further reduce system power consumption while ensuring the safety of operators.
Composition of laboratory negative pressure residual air environment control system After accurately controlling the surface wind speed of a single fume hood in the laboratory, in order to maintain the safety of the surrounding environment of the laboratory, it is necessary to control the negative pressure of the laboratory. By keeping the laboratory at a reasonable negative pressure (negative tens of Pa), the leakage of laboratory gas into the corridor or adjacent offices can be avoided. It is very important to ensure the safety of the environment around the laboratory, such as corridors, laboratory personnel offices, etc.
Since the use of negative pressure control requires the airtightness of the room, the opening and closing of doors and windows, etc., another room control system that reasonably controls the fresh air and safety of the room is the use of residual air volume control. The residual air volume controller refers to monitoring the exhaust air volume of the entire laboratory fume hood before adding a certain amount of fresh air to form a reasonable fresh air and maintain a certain residual air volume environment.
A laboratory negative pressure control system includes a negative pressure controller, a differential pressure sensor, and a regulating valve; the residual air volume control system includes a residual air volume controller, and the valve can be adjusted.
The composition of a single whole laboratory variable air volume control system The composition of a single whole laboratory is to have the face velocity controller of each fume hood integrated with the room negative pressure control system.
Adjustment window displacement sensor
Regulating valve
Sided fan speed controller
Sided wind sped sensor
Room pressure sensor
Regulating valve
Supplementary air regulating valve
Room negative pressure controller
Composition of multiple laboratory variable air volume control systems. The composition of multiple laboratories is that the entire system can be formed by networking the air inlet and exhaust ducts, as well as the electric control part of the network according to the actual situation in multiple rooms.
Laboratory ventilation systems designed on the market today are generally divided into three categories, simple control of constant air volume systems, iteratively upgraded dual air volume systems on this basis, and brand new variable air volume systems. However, it can be seen from the product naming that the function of the variable air volume system is relatively superior. The traditional ventilation system has poor exhaust effect, bad flexibility, and high noise, which can not meet the requirements of the laboratory at all, so the variable air volume The system was born in response to the times. The variable air volume system is also divided into variable air volume butterfly valve and variable air volume venturi valve. What is the difference between the two? Let’s take a look.
Butterfly valve is a type of valve, it can be used to adjust the opening, the shape is like a butterfly, when the wind speed is measured, it can use its own sensor to convert the measured value into an electrical signal, and then the system will be based on The signal regulating air valve is closed-loop feedback controlled as a whole, and the structure is relatively simple and easy, and it can ensure safety.
But the shortcomings of the variable air volume butterfly valve are also very obvious. The most fatal part is that its control accuracy is not high, because it will be affected by the position and number of measuring points, and the sensor also needs time to respond. If you do not pay attention to the installation, the internal and external airflow will be disordered. It will also cause the butterfly valve control to be unstable, the signal response time will be longer, and the accuracy can only be maintained at about 20%. The advantage of this type of valve is that it is easy to use and the design is straightforward. If you do not consider the use of noise or where there is no accuracy requirement, the butterfly valve is more cost-effective.
But if it is a variety of laboratories, or hospitals with precision instruments, the butterfly valve will expose its shortcomings, and then the upper variable air volume venturi valve will have to be used. The variable air volume system also uses sensors, but different from the butterfly valve, it uses a displacement sensor to measure the opening of the sliding door, and then transmits the signal to the controller. The controller has its own algorithm formula and adjusts the valve according to the calculated air volume. The size of the opening can adjust the exhaust air volume of the system.
The advantage of the variable air volume venturi valve is that the system has good anti-interference ability. Compared with the traditional butterfly valve, its accuracy can reach only 5%, and it can also achieve a high adjustment ratio that cannot be achieved by traditional valves. For example, Desai Zhiyan The tsirosmax variable air volume venturi valve can reach a turndown ratio of 20:1, which is relatively prominent in the industry products. In theory, the response time of the Venturi valve can be less than 1 second, and it will not be affected by other external pressures.
In general, different laboratories have different ventilation requirements, and the choice of valves should be tailored to local conditions. If you are not sure whether to choose a butterfly valve or a Venturi valve, you can also consult the designers or experts of Desai Zhiyan to ensure targeted design and ensure the safety and normal operation of the laboratory. On this basis, we must also choose high-quality and well-known manufacturers, such as Shenzhen Xicheng Environmental Protection Technology Co., Ltd., which can save costs for users and improve comfort on the basis of high quality.
The electric air valve adopts a new generation of electric controller to precisely control the air volume. Intelligent operation and easy installation. It is widely used in laboratory ventilation equipment, industrial ventilation systems, and environmentally friendly waste gas treatment equipment.
The wind valve material is PP and PVC, which is characterized by anti-corrosion, anti-aging, price concessions, easy installation
The current manual air valve mold a molding, high strength, good sealing, smooth appearance, low resistance. Its specifications are diameter 63 mm, 75 mm, 90 mm, 110 mm, 160 mm, 200 mm, 250 mm, 315 mm. The diameter of this pneumatic equipment is more than 355 mm which can be customized.
Although the pneumatic valve is more popular, it still has its value. The electric air valve is composed of two parts, an angular-stroke electronic electric actuator and a butterfly valve adjustment. This mechatronics design can simultaneously realize the functions of the opening signal position feedback, position indication, and manual operation. It can be said to be powerful, Reliable performance and precise control.
The working principle of the electric actuator is to use the forward and reverse rotation of the motor to realize the switch of the valve. The air volume can be automatically adjusted through the intelligent sensor system.
Features:
It is mostly used in cold air or hot air gas pipelines in ventilation and environmental protection projects. The specific industries are chemicals, building materials, power stations, glass products, etc. The sealing ring of the electric air valve is tightly processed with the same high-strength material as the valve body, which has good stability. It also has the advantages of simple structure, small operating torque and light weight, and the characteristics of rapid opening and closing, flexible actions, small operating torque, and large flow capacity are also one of the reasons for the good response of users. It can be applied to the control and adjustment of dust, flue gas, air, and fluids containing suspended particles and thick and turbid and slurry fluids, so it can be regarded as a powerful and practical component in industrial control components.
There is also a manual switch valve function on the electric actuator of the electric damper, which is to make emergency treatment in the absence of points and emergency situations. The editor here wants to remind everyone that it is best to do routine maintenance of the electric damper when using it, so as to extend its working life and ensure its working stability.
China Xicheng Environmental Protection has 16 years of experience in the research and development, and production of industrial waste gas purification equipment. It has developed a new generation of RHV series Venturi variable air volume control valves with independent intellectual property rights, integrating high-speed intelligent control, automatic mechanical compensation, and pressure-independent control technology. Integration to meet the unique requirements for airflow control in industrial exhaust gas ventilation systems. The PP series Venturi variable air volume valve is mainly suitable for constant air volume control, bistable control, or variable air volume control.
1. Pressure-independent control: mechanical pressure compensation components are installed in the sliding valve body in the valve body, and automatic pressure compensation is carried out according to the pressure difference between the inlet and outlet of the air duct to ensure that the air valve maintains a constant air volume at the setpoint when the static pressure changes; the valve can be at the valve end The pressure drop is within the range of 150Pa~750Pa to achieve pressure independent control;
2. Accurate airflow control: through the positioning of the airflow speed controller component, the air volume can be quickly adjusted, and the air volume control accuracy is ±5%;
3. Large air volume adjustment control range: air volume 50m3/h~1100m3/h;
4. Quick response: Response time to control signal and air duct static pressure change: <1 second;
5. Anti-dust and maintenance-free: Compared with similar products of conventional butterfly valves, because this series of products have no airflow (or pressure difference) sensor, it avoids the occurrence of safety accidents that cause system failure to dirty sensors and improves the stability of the product And durability.
6. High anti-corrosion treatment: The valve body is made of PP plastic material. Yes, this product can operate safely for a long time under high-strength corrosive conditions;
7. High reliability, high quality, and low price, good service: domestically produced high-quality products, reliable operation, high quality, and low cost, and provide 24-hour service.
Typical applications of PP series Venturi variable air volume control valve:
1. Constant air volume control (CAV series): Suitable for situations where the set air volume is maintained when the static pressure changes.
2. Variable air volume control (VAV series): suitable for closed-loop feedback variable air volume control occasions.
