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Introduction to Variable Air Volume System (VAV System)

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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.

variable air volume system control

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.

Product introduction of constant air volume air valve

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Constant air volume valve is a mechanical self-operated device suitable for ventilation and air conditioning systems that require constant air volume. The air volume control of the constant air volume valve does not require external power. It relies on the air flow in the air duct to position the control valve, so as to maintain the air flow at the preset flow rate in the entire pressure difference range.

Classification of constant air volume valve

One is to sense the air flow through the air duct through the silicone airbag in the balancer, and automatically shrink and expand according to different static pressures to achieve a constant air volume. When the static air pressure at the inlet and outlet is the smallest, the air bag is in a contracted state. When the static pressure at the air inlet and outlet increases, the air bag begins to expand, thereby reducing the gap around the air bag. Keep the flow constant within a certain wind pressure range.

The other type is a mechanical self-contained device, which relies on the airflow pressure in the air duct to locate the position of the control valve, so as to maintain the airflow at a preset flow rate within a certain pressure difference range. It does not require external power, and an electric actuator can be added to change the flow setting through remote control signals.

Application of variable wind system

In the variable air volume air-conditioning system, generally the outer area adopts the variable air volume method, and the inner area adopts the constant air volume method. In an air supply system with constantly changing air volume and air pressure, the constant air volume design of the inner area is inseparable from the constant air volume valve.

Exhaust system application

A good air conditioning system design, its exhaust system must be very reasonable, and this is often overlooked. In civil buildings, especially in high-rise buildings, the airtightness of the envelope structure is very good, and the positive pressure value of the room can be maintained with less air volume. About 85 to 90% of the fresh air volume must be discharged outdoors through organized exhaust air, so as to ensure the balance of air supply and exhaust air, otherwise no amount of fresh air can be sent into the room. In civil buildings, exhaust air is generally discharged outdoors through auxiliary rooms such as toilets and boiling water rooms. In addition, sometimes an exhaust system should be added to ensure the balance of air supply and exhaust.
Features

The constant air volume valve is an automatic mechanical mechanism that does not require external power. An additional electric actuator can be added to change the flow setting through remote control signals. The constant air volume valve can be used in air supply and exhaust systems. The working temperature is generally 10 to 50 °C, and the pressure difference range is 50 to 1000 Pa, that is, at least 50 Pa pressure difference is applied before the valve and behind the valve, otherwise the constant air volume valve cannot work. This should be noted, because the wind pressure value of the fresh air unit of the fresh air system is generally not large. The fixed air volume valve is not limited by position when installed, but the valve shaft should be kept horizontal. Generally, a straight inlet air duct with a distance of 1.5 times the long side of the valve and a straight outlet air duct with a distance of 0.5 times are required.

The constant air volume valve has high control accuracy, an external pointer shows the flow scale, the adjustment accuracy is about ±4%, and the current limiting mechanism does not need maintenance. Just as the balance valve is more and more adopted by the majority of designers in the air-conditioning water system, the constant air volume valve will also be widely used in the air supply and exhaust system due to its precise adjustment and automatic balance characteristics.

Air Duct Application

In an all-air system, due to the influence of building conditions, the resistance between the branch pipes must be unbalanced. Generally, a three-way regulating valve or a split multi-leaf regulating valve is used to complete the air volume distribution. In order to ensure that the air volume in important rooms or main branch pipes will not be too large or too small, and reduce the blindness of debugging, a set air volume valve can be appropriately added to replace the three-way regulating valve or the split multi-leaf regulating valve.

Purification system application

It is very important to maintain the positive pressure value of the clean room in the purification air conditioning system. Adding a set air volume valve in the exhaust or air supply and exhaust system can effectively ensure the positive pressure value of the clean room. The clean operating room needs to maintain positive pressure in the operating room during and when the operation is not in progress. The fresh air volume during the operation is the fresh air volume required to ensure the positive pressure plus the fresh air volume required by the personnel. When the operation is not in progress, the fresh air volume is only to ensure positive pressure. The required fresh air volume, so a double-position fixed air volume valve needs to be set on the fresh air duct.

The difference between variable air volume butterfly valve and venturi valve

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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.

PP Electric Air Volume Control Valve 

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The PP electric air volume control air valve adopts injection molding, which has strong sealing, beautiful and durable, and is connected to the air pipe for air adjustment. Injection molding air valve is divided into two kinds of materials: one is PP and the other is PVC. Diameters within Φ315mm are injection molded, and other large sizes are manually welded, and they can also be made of stainless steel or glass fiber reinforced plastic materials.

The PP electric air volume control air valve is mainly used in the experimental fume hood and the ventilation pipe of the etching and electroplating production line equipment. It has the advantages of high strength, good heat preservation, moisture resistance, corrosion resistance, good non-combustibility, high temperature resistance, easy installation, etc. Our company can process and manufacture square and round air valves of various specifications according to the drawings and specifications provided by the user.

The electric air volume control valve adopts our self-developed electric control actuator. It can precisely control the air volume. The polypropylene raw material used for injection molding has the characteristics of anti-chemical corrosion, compression resistance, and light weight. It can be widely used in various ventilation duct systems.

This product has a wealth of size models, DN90MM, DN110MM, DN160MM, DN200MM, DN250MM, DN315MM, DN400MM, DN500MM or customized sizes.

Reasons for choosing us:

Honest manufacturer, reasonable price and quality assurance.

Source manufacturer, sufficient inventory, high cost performance.

Free technical support, answer technical questions for you throughout your life.

You can join agents to provide you with exclusive sales channels.

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Air Control Valve Polypropylene PP Manual Air Valve

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The air valve is an indispensable central air-conditioning terminal accessory in the ventilation, air scheduling and air purification engineering of industrial plants and civil buildings. It is generally used in air conditioning and ventilation system pipes to control the air volume of branch pipes. It can also be used for fresh air and return air. Mixed scheduling.

The air valve is an indispensable central air-conditioning terminal accessory in the ventilation, air scheduling and air purification engineering of industrial plants and civil buildings. It is generally used in air conditioning and ventilation system pipes to control the air volume of branch pipes. It can also be used for fresh air and return air. Mixed scheduling.

1. Structural characteristics of the air valve

(1) The air volume control valve has four specifications when the blade width is all the same. The blade shape is a diamond-shaped double blade, and the blades are soft overlapped, so the sealing performance is excellent.

(2) The valve body frame of the air volume control valve is injection molded from polypropylene material, which has good sealing performance. The product itself has the characteristics of anti-acid and alkali corrosion, and can be widely used in exhaust gas exhaust pipes.

(3) The dispatch valve is divided into manual and electric. The valve body structure and specifications are the same.

2.the characteristics of the air valve

(1) The takeover standard of the split multi-leaf air volume dispatching valve is the same as the rectangular air duct standard of the national ventilation duct standardization.

(2) The blades of the air volume dispatching valve are side-opening and forward-opening, which are used as dispatching valves in ventilation, air dispatching and air purification systems.

(3) According to the test, the air-tightness of the air volume dispatching valve is good, and its relative air leakage is about 5%, and the dispatching performance is good.

3.the scope of application of the air valve

It is widely used in industrial, mining, and civil building HVAC systems to accurately schedule air flow. It is one of the key equipment for controlling ventilation modes in various environments. Its main features are flexible work, low noise, small leakage, reliable structure, safety and convenience.

The above are the main functions and features of the air valve. There are also different types of air valve for different occasions and needs.

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PVC plastic manual damper

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Product Introduction

China Xicheng Environmental Protection Company specializes in the production of PVC plastic manual dampers, made of PP polypropylene, suitable for chemical, laboratory and other ventilation systems with explosion-proof requirements. PVC plastic manual dampers are composed of plastic dampers and pneumatic actuators. Dimensions Support customization, square or round.

PVC plastic manual damper product introduction

The PVC plastic manual air valve is made of PVC and is resistant to acid and alkali corrosion. The working principle of the PVC plastic manual air valve is the same as that of the PVC electric air valve, except that the electric actuator is changed to a pneumatic actuator, and the air pipe is controlled by a third-party plate solenoid valve. The switch realizes the opening and closing of the PVC plastic manual damper.

electric control valve

PVC plastic manual air valve is suitable for application environments with explosion-proof requirements such as chemical plants and laboratories. It is used in PVC ventilation pipe systems and is connected with PVC air pipes. It is used for exhaust control of corrosive gases, corrosion-resistant and acid-resistant. Alkali, PVC plastic manual air damper has complete specifications, supporting PVC air pipes, elbows, tee, and variable diameters to form a complete PVC ventilation piping system. The pneumatic actuator of the PVC plastic manual air valve can be selected according to the specifications of the air valve. Torque.

PVC plastic manual air valve is a non-closed butterfly valve, which is widely used in universities, chemical industry, biology, electric power, energy, environmental engineering, etc. In the production process, the temperature of the medium is ≤90℃ and the nominal pressure is less than 0.1Mpa. Connecting, opening and closing or adjusting the medium, usually installed on the top of the fume hood, PVC suction hood, and at the entrance of the one-use one-standby spray tower pipe, as a switch to the spray tower exhaust gas flow direction.

Principle of PVC plastic manual damper

The PVC plastic manual damper is installed in the PVC/PP piping system. Through manual operation or PLC automatic control technology, the damper can be opened and closed as required. The principle is that plastic blades are installed in the damper, and the damper is rotated by the damper actuator. , Drive the rotation of the butterfly valve blades to achieve a 90-degree turning angle to achieve the purpose of opening and closing, and has a feedback indication function. Through the pressure difference detection device, after closing the air valve, the signal is transmitted to the PLC system, so as to control the PVC fan frequency converter to reduce the speed and energy-saving operation.

The structure of PVC plastic manual damper

  • Circular structure, flange connection;
  • Square structure, flange connection.

Performance characteristics of PVC plastic manual damper

  • PVC material processing, acid and alkali corrosion resistance, strong anti-corrosion performance;
  • PVC manual air valve with socket design at both ends, and flange connection can also be welded;
  • High-strength actuator, all-copper design, switch life is more than 20,000 times;
  • The inner and outer walls are smooth and the wind resistance is small.

What material is the main material of the PP duct valve

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The current decoration market has very high requirements for PP ducts, including material, price, and other aspects. Although the small PP pipe is inconspicuous, it plays a vital role in home decoration. People are very concerned about the material of PP air pipe valves, so what materials are used for PP air pipe valves on the market now? The following editor will introduce you to the relevant information about PP air pipe valves.

What material is the main material of the PP duct valve

PP duct, glass fiber reinforced polypropylene pipe. Specializing in the production, sales, and installation of FRPP ducts, the raw materials are pure and no return material is added, the equipment is advanced, and the technology is sophisticated. The FRPP ducts produced have smooth inner and outer walls, uniform texture, low fluid resistance, and strong ventilation; acid and alkali resistance, corrosion, and temperature resistance It has stable performance prevents secondary chemical reactions between the medium in the tube and the tube body, and reduces the difficulty of purification of industrial waste gas and liquid; it is non-toxic and tasteless, environmentally friendly and hygienic, non-scaling and non-bacterial, suitable for process pipelines in the food industry. Air ducts are pipes used for air transportation and distribution. In the chemical, food, and other industries, the requirements for ventilation duct systems are getting higher and higher. Metal ducts are far behind plastic ducts in terms of chemistry, hygiene, and economic efficiency. PP air ducts are widely used in the purification treatment of acid mist, alkali mist, alkaline waste gas, and organic waste gas in chemical, chemical fiber, textile, pharmaceutical, and other industries.

Classification of PP duct valves

1. One-time regulating valve: If the system is not balanced, it is a regulating valve designed to achieve the required air volume. It is divided into flapper valve, butterfly valve, multi-leaf regulating valve, and three-way valve.

2. Frequently switched regulating valves: Mainly include fresh air valve, primary and secondary air return valve, exhaust valve (including exhaust valve for comprehensive exhaust and partial exhaust).

3. Automatic control valve: Mainly used for automatic adjustment of fresh air, primary return air, and secondary return air. In addition to meeting the requirements of frequently-on-off regulating valves, it should also have good regulating characteristics.

Material and advantages of PP duct valve

The so-called PP pipe actually refers to the material made of polypropylene, which is mainly used in the indoor cold and hot water supply system of buildings. Compared with other materials of pipes, it has good advantages:

1. No corrosion: PP duct valve can withstand the PH value in a wide temperature range, ranging from 1 to 14 high acid and alkali corrosion concentrations.

2. Wear-resistant and non-scaling: PP pipe valves and pipe fittings have a uniform and smooth inner walls, with low flow resistance and no scaling.

3. Reduce vibration and noise: PP pipe valve has excellent sound insulation performance, which can significantly reduce vibration and noise caused by liquid flow.

4. Anti-freeze cracking: PP material has excellent elasticity so that the pipes and pipe sections can expand with the frost heaving liquid without cracking. 5. Anti-condensation, low heat loss: PP material is a poor thermal conductor, reducing condensation and reducing heat loss.

5. Simple installation: PP pipe valve is light in weight, easy to install and operate, and has weldability.

PP/PVC Electric Air Valve

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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.

Specification

itemvalue
MaterialPP/PVC
Specification50~315mm or customize
ColorBeige or grey
PaymentT/T
Delivery Time15 Days
ShapeRound Shape
BrandXICHENG
PackagePlastic
DescriptionAcid And Alkali Corrosion Resistance
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The working principle of PP ball valve

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The opening and closing part of the PP ball valve is a sphere with a circular channel, which rotates around an axis perpendicular to the channel, and the sphere rotates with the valve stem to achieve the purpose of opening and closing the channel. The PP ball valve can be closed tightly with only a 90-degree rotation and a small torque.

According to the requirements of the working conditions, different driving devices can be assembled to form a variety of ball valves with different control methods, such as electric ball valves, pneumatic ball valves, hydraulic ball valves, etc.

Working principle of PP ball valve:

When the ball PP valve rotates 90 degrees, it should show a spherical surface at the inlet and outlet, so as to close the valve and cut off the flow of the medium.

Advantages of PP ball valve

1. The PP ball valve is not restricted by the installation direction, and the flow direction of the medium can be arbitrary. The fluid resistance is small, and the full-bore ball valve basically has no flow resistance.

2. The PP ball valve has a simple structure, relatively small size, light weight and easy maintenance.

3. Close and reliable. It has two sealing surfaces, and the current sealing surface materials of ball valves are widely used in various plastics, which have good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems.

4. PP ball valve is suitable for frequent operation, opening and closing quickly and lightly. It is easy to operate and open and close quickly. It only needs to rotate 90° from fully open to fully closed, which is convenient for remote control.

5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

6. PP ball valve has good sealing performance. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when the medium passes.

7. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied from high vacuum to high pressure.

8. Because the PP ball valve has wiping properties during the opening and closing process, it can be used in media with suspended solid particles.

9. PP ball valve has low fluid resistance, no vibration and low noise.

Functional characteristics of electric air valve

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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 electric actuator:

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.

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