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.
The air volume control valvehas a basic structure: to place a (baffle plate) in the center of the air duct. The valve plate can rotate around an intermediate shaft parallel to the valve plate. Become an electric multi-leaf air volume control valve.
Air volume control valves are generally divided into the following types:
The constant flow function of the air volume regulating valve is realized by the contraction and expansion/contraction of the silicon capsule located in the middle of the balancer. The principle is that the built-in silicon capsule with the adjustable cross-sectional area can automatically adjust the cross-sectional area when the wind pressure and air volume change and keep the air volume stable in the wind pressure range 50-200pa and high pressure in the range of 150-600pa. There is no need for power control, no initial adjustment, no maintenance, 30-year service life, stable work under -10-60 feeding degree environment.
The air volume control valve has the following characteristics:
1. The role of water balance. The air volume distribution in various ventilation systems is reasonable, ensuring reliable fresh air distribution in different areas.
2. The function of energy-saving and precise control of air volume. On the premise of ensuring the fresh air volume, the system runs energy-saving and low-consumption
3. It is widely used in the industrial waste gas treatment industry, which can accurately control waste gas emissions and prevent the backflow of toxic waste gas.
4. The effect of reducing noise. It can effectively reduce wind noise and other noise in the air duct, especially in the exhaust system of industrial production and office buildings, replacing exhaust fans, significantly reducing noise, saving energy, and maintaining continuous ventilation.
The constant air volume regulator with nothing to do with the pipeline pressure is used in the central fresh air system and exhaust system to effectively ensure the continuous new air volume and exhaust volume effectively and accurately control the air volume and reduce noise. They are usually used in a large area in the air duct system of the central fresh air system and exhaust system of hotels, hospitals, office buildings, and other places to replace traditional manual valves and exhaust fans.
The air volume control valve has a range:
The electric air volume control valve is suitable for industrial waste gas treatment, civil building HVAC systems, ventilation equipment in school laboratories, and hospital ventilation and exhaust systems. It is one of the vital equipment to control ventilation modes in various environments. Its main features are flexible operation, low noise, small leakage (closed type leakage> 0.5%), wide operating temperature range, reliable structure, safe and convenience.
The Venturi air volume control valve has changed the air volume control mode, making the air volume control more stable and accurate, and the valve is independent of pressure. It can respond exceptionally quickly to pressure fluctuations in the air duct and ensure the stability of the air volume control. It is widely used in Places where precise control of air volume is required.
The Venturi air volume control valveis a high-precision, fast response and has nothing to do with pressure changes. It is an air volume control device driven by a short linear stroke electric actuator; it has a unique valve core assembly that is not affected by changes in static pressure in the air duct and is built-in precision stainless steel. The spring maintains a constant air volume by changing the valve core position when the pressure in the air duct changes. Its many characteristics give the laboratory control system a good performance in the fume cupboard and laboratory control.
In the variable air volume system, the Venturi valve is not affected by the static pressure change in the air pipe. When the pressure in the air pipe changes, the valve core position is changed to maintain a constant air volume. After receiving a control command signal from the controller, it is quickly adjusted to the corresponding air volume. As long as the pressure of the air pipe is within the operating range of the variable air volume venturi valve, the venturi valve will accurately control the air volume. After adopting the Venturi valve solution, the designer can hardly consider the difference between the air duct system’s nearest and most negative loop. The Venturi valve can quickly eliminate such unfavorable factors, and there is no air duct pressure balance during system commissioning. .After installation, as long as the corresponding input/output monitoring points are connected according to the wiring diagram, it can be used immediately, saving a lot of on-site debugging time.
The fume hood control system of the Venturi air volume control valve can well solve the problem of the system pipe network pressure change, and the Venturi valve can automatically adjust according to the pipe network pressure change. This process coincides with the pressure change of the pipe network, thus avoiding the adjustment of this process by the wind speed control system and realizing fast and stable air volume control.
Variable air volume fume hood exhaust air control is a typical application of the venturi valve. Fast and accurate exhaust air volume control can always keep the wind speed of the exhaust surface of the fume hood stable within the set range. The Venturi valve quickly determines the required exhaust air volume through the fume hood door position sensor and maintains the face wind speed when the fume hood is running. It can also connect the area occupancy detector, automatically switch the work/standby mode, and reduce the energy consumption of the fume hood. The Venturi valve can be connected to a fume hood touch screen operation display to achieve more display and operation functions.
The focus of laboratory construction is the ventilation system. The core of the ventilation system is airflow control. The precise and fast response air volume control valve has become the top priority: budget, safety, reliability, and operating costs. After the four elimination methods were screened, the airflow control of the Venturi valve became one of the few remaining items.
China Xicheng Environmental Protection Equipment Co., Ltd. has successively developed clean gas storage cabinets, fume hoods, and laboratory waste liquid collection systems with filtration and adsorption technology. High-precision VAV variable airflow control system and a closed sampler that is completely leak-free and easy to operate, and provides a complete set of laboratory toxic and harmful gas treatment programs, and has the current international microbubble organic waste gas treatment technology. The technologies mentioned above have independent intellectual property rights. Provide safe, energy-saving, and environmentally friendly airflow control and exhaust gas purification technology for the laboratory.
PP air valve and air volume control valve are indispensable central air conditioning terminal accessories in the ventilation, air conditioning, and air purification engineering of industrial plants and civil buildings. They are generally used in air conditioning and ventilation system pipes to adjust the branch pipes’ air volume. It can also be used The mixed adjustment of fresh air and return air is used as a gas medium to adjust the flow or cut off the dust in the dusty cold air or hot air gas pipeline of the ventilation and environmental protection projects in the hardware, chemical, building materials, power station, glass, and other industries. According to the operation, it can be divided into manual damper and electric damper. pp windpipe
The electric air valve is composed of the electric actuator and valve body. Electric butterfly valve usually consists of angular stroke electric actuator (0～90°partial rotation) and the butterfly valve as a whole through mechanical connection. The active mode is classified into the on-off type and regulating type, and the latter two are general. It is a straight thread electric actuator (0～100), and the valve body is mechanically connected with PP packing.
Features of the electric damper
1. It is designed and manufactured by adopting a new structural form of welding of mid-line disc plate and temporary structure steel plate. It has a compact structure, lightweight, easy installation, low flow resistance, large circulation, avoids the influence of high-temperature expansion, and is easy to operate.
2. 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 direction of the medium.
use:
This butterfly valve is a non-closed butterfly valve, which is widely used in the production process of building materials, metallurgy, mining, electric power, and other production processes on pipelines with a medium temperature of ≤300℃ and a nominal pressure of 0.1Mpa to communicate, open and close or adjust the amount of medium.
Structural features:
This butterfly valve is designed and manufactured by adopting a new type of structure welded between a centerline disc plate and a temporary structure steel plate. It is compact in format, light in weight, easy to install, small in flow resistance, large inflow, and easy to operate. There are no connecting rods, bolts, etc., in the body, reliable work, and long service life. It can be installed in multiple positions and is not affected by the flow direction of the medium.
working principle:
The butterfly valve is driven by a motor to go to the actuator. The disc can rotate freely within the range of 90° to achieve the purpose of opening and closing or adjusting the flow of the medium.
Electric damper Uses and characteristics
This valve is made of the same material as the valve body and processed into a sealing ring, which adopts electric or pneumatic transmission. The applicable temperature depends on the material selection of the valve body, and the nominal pressure is ≤0.6MPa. Generally, it is suitable for industrial, metallurgical, environmental protection, and other pipelines for ventilation and media flow adjustment. Its main features are:
Novel and practical design, unique structure, lightweight, and rapid opening and closing.
Small operating torque, convenient operation, labor-saving and dexterous.
Use suitable materials to meet the requirements of low, medium, and high medium temperatures and corrosive mediums.
Electric damper adopts standard
Design standard: GB/T12238-1989 JB/T8692-1998
Flange connection size: GB/T9115.1-2000
Structure length h: GB/T12221-1989
Pressure test: GB/T13927-1992; JB/T9092-1999
electric damper actuator
Adopt the new series of GT electric actuators, double-acting and single-acting (spring reset), gear transmission, safe and reliable; large-diameter valves adopt series AW-type pneumatic actuators with fork drive, reasonable structure, ample output torque; there are double-acting and single-acting.
Geared double pistons, ample output torque, and small volume.
The cylinder is made of aluminum gold material, which is light in weight and beautiful in appearance.
Manual operating mechanism can be installed on the top and bottom.
The rack-and-pinion connection can adjust the opening angle and rated flow.
The actuator can be equipped with electrical signal feedback instructions and various accessories to realize automatic operation.
IS05211 standard connection provides convenience for product installation and replacement.
The joint screws adjusted at both ends can make the standard product have an adjustable range of ±4° between 0° and 90°. Ensure the synchronization accuracy with the valve.
the option of electric damper and accessories
The following accessories can be selected according to different controls and requirements:
Adjustable accessories: electric positioner, pneumatic positioner, electric converter.
Air source treatment accessories: air filter pressure reducing valve, air source treatment triple pieces.
Manual mechanism: HVSD manual mechanism
Performance characteristics of PP damper
Features of the manual damper
(1) The connecting pipe size of the split multi-leaf air volume regulating valve is the same as the rectangular air pipe size stipulated by the national ventilation duct standardization.
(2) The manual air valve blades are side-opening and forward-opening and are used as regulating valves in ventilation, air conditioning, and air purification systems.
(3) Tested and measured, the air volume regulating valve has good air tightness, and its relative air leakage is about 5%, and the regulating performance is good.
the structural characteristics of the manual damper
(1) The manual air valve is unified into four specifications in the blade width. The blade shape is a diamond-shaped double blade. The blades are softly overlapped, so the sealing performance is good.
(3) The manual air valve body frame is formed by cold-rolling 2mm galvanized sheet, then it is welded by carbon dioxide gas shielded welding or processed and welded from ordinary Q235 board; the blade is cold-rolled with 1mm galvanized sheet into a corrugated shape, two pieces Synthetic spot-welded square shaft, or 2mm G235 steel plate cold-formed, single-piece punched square shaft or welded round shaft.
the scope of application of the air volume control valve
It is widely used in industrial, mining, and civil building HVAC systems to adjust airflow accurately. It is one of the vital equipment to control ventilation modes in various environments. Its main features are flexible operation, low noise, small leakage (closed type leakage <0.5%), wide operating temperature range, reliable structure, safety, and convenience.
The manual rectangular duct damper is made of PP polypropylene, which is resistant to acid and alkali corrosion. The production process of the manual rectangular duct damper is relatively complicated. It needs to be carved and cut from polypropylene PP sheet, and then produced by company A by manual welding. Production cannot be automated, so the cost of the rectangular duct damper is high.
Manual rectangular duct damper is suitable for chemical plants, laboratories and other application environments with explosion-proof requirements. It is used in PP material ventilation duct systems and is connected with PP air ducts. It is used for corrosive gas extraction and exhaust control, anti-corrosion, acid and alkali resistance , PP plastic manual rectangular duct damper complete specifications, supporting PP duct, elbow, tee, variable diameter use, constitute a complete PP ventilation duct system.
Manual rectangular duct damper is a kind of non-sealed butterfly valve, which is widely used in universities, chemical, biological, 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. 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.
Structure of PP plastic manual rectangular duct damper
The air volume control valve is also called the air control valve. It is an indispensable central air conditioning terminal accessory in the ventilation, air conditioning and air purification engineering of industrial plants and civil buildings. It is generally used in air conditioning and ventilation system pipes to adjust the air volume of branch pipes. It can also be used For the mixed adjustment of fresh air and return air.
Features
(1) The connecting pipe size of the split multi-leaf air volume regulating valve is the same as the rectangular air pipe size stipulated by the national ventilation duct standardization.
(2) The blades of the air volume regulating valve are split-opening and forward-opening, and are used as regulating valves in ventilation, air conditioning, and air purification systems.
(3) Tested and measured, the air-tightness of the air volume regulating valve is good, the relative air leakage is about 5%, and the regulating performance is good.
Scope of use
Air volume control valves are widely used in industrial, mining, and civil building HVAC systems, industrial waste gas purification systems, and are one of the key equipment to control ventilation modes in various environments.
Material and category
The common materials of the air volume control valve are PP material, stainless steel material, PP material, and galvanized steel plate. The most used in the industrial waste gas purification industry is the PP damper.
The air volume control valve installation is carried out in accordance with the national building standard design “Air Valve Selection and Installation”. described as follows:
1. For the damper products transported to the construction site, the installation unit should report to the supervisor for acceptance, and check the certificate, test report and installation instruction document according to the packing list, and verify the product model, specification, material, logo and Whether the control method meets the requirements of the design documents, it should be recorded and signed by all parties for confirmation.
2. Before installing the air valve in place, check whether its structure is firm and tight, and conduct a switch operation test to check whether it is flexible and reliable; the electric air valve shall be energized and tested one by one, and test records shall be made.
3. Before the air valve is in place, it must be checked whether its applicable scope, installation position, air flow direction and operating surface are correct.
4. The opening and closing direction and opening angle of the air valve should be accurately marked on the visible surface.
5. For air valves installed in high places, the manual operating device should be 1.5-1.8m away from the exposed or operating platform.
6. The effective distance between the operating surface of the air valve and the wall, ceiling and other equipment and pipes shall not be less than 200mm, and the air valve shall not be installed in the structural layer or hole. The slit width around the valve should be greater than 150mm.
7. Check whether the flange size reserved for the connecting air pipe, the matching drill diameter and hole distance, the flatness and parallelism of the flange surface, the material and thickness of the gasket, and the connection method of the non-metallic air pipe meet the requirements.
8. Check whether the position and method of the support and hanger meet the requirements of the specification or design documents. A single damper with a weight greater than 50kg should be provided with a separate support and hanger; electric damper should generally be equipped with a separate support and hanger; for soft non-metal air duct systems, a separate support and hanger should also be provided for the damper .
9. The air valve used in the clean ventilation system must be cleaned as required before installation, and the two ends must be sealed after reaching the corresponding clean standards, and the sealing plate can be removed after it is in place. The inner surface of the air valve of the scrubbing purification air conditioning system should be made of materials that do not drop fibers. The scrubbed air valve must not be stored in a room without walls, floors, doors and windows, and the temporary storage place must be kept clean.
The air valve is the most critical connecting component in the air purification system, and the installation process is straightforward. But also need to pay attention to the following matters:
Before installing the air valve, check whether the frame structure is firm and whether the adjustment, braking, positioning, and other devices are accurate and flexible.
The air valve installation is the same as that of the air pipe: align its flange with the flange of the air pipe or equipment, add sealing gaskets, and tighten the bolts to make the connection with the air pipe or equipment firm and tight.
When installing the air valve, the valve’s operating device should be convenient for manual operation. The installation direction should be consistent with the path marked on the valve body shell.
The installed air valve should have clear and accurate opening direction and opening degree signs on the valve body shell.
The fusible piece of the fire damper should be installed on the windward side of the air duct, and its melting point should meet the design requirements.
Several commonly used types of air valve installation requirements
Several commonly used air valve types: multi-page control valve, fire damper, check valve, electric control valve, manual control valve.
Multi-page valve
If there are many branches, install a split multi-page control valve at the addition of the duct. If the wind speed at the end is stricter, you can add a split multi-page control valve before the end;
Check valve
When the system is worried that the airflow in the room at the end of the individual branch will flow back to the system, it is necessary to add a check valve on this branch;
Electric valve
The electric control valve is generally installed at the air pipe interface of the equipment. If the system requires electric control at the end, it also needs to be added;
The installation of the air duct needs to be distributed and installed according to the specific purification system design plan. Because the air volume control valve plays a vital role in the entire purification system, you should choose a product of qualified quality when purchasing the air valve. Simultaneously, it needs to have the characteristics of fire prevention, corrosion resistance, and good sealing. It is recommended to use the damper products of China XichengEnvironmental Protection Company. The products have undergone strict quality inspection, provide professional purification scheme design, and worry-free after-sales service. The products are exported to many countries around the world.
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) 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 dispatching valve is formed by cold rolling of 2mm galvanized sheet and then welded by maintenance welding of carbon dioxide gas or processed and welded from general Q235 sheet; the blade is cold-rolled with 1mm galvanized sheet into a corrugated shape, two pieces It is composed of spot welding inserting square shaft, or 2mm G235 steel plate cold forming, single-piece punching inserting square shaft or welding round shaft.
(3) The dispatching valve is divided into manual and electric. According to the materials used, it is divided into four types: carbon steel plate, galvanized plate, aluminum alloy plate, and stainless steel plate. 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.
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 valvefor different occasions and needs.
Thepolypropylene PP 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.
Structural characteristics of the polypropylene PP 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 dispatching valve is formed by cold rolling of 2mm galvanized sheet and then welded by maintenance welding of carbon dioxide gas or processed and welded from general Q235 sheet; the blade is cold-rolled with 1mm galvanized sheet into a corrugated shape, two pieces It is composed of spot welding inserting square shaft, or 2mm G235 steel plate cold forming, single-piece punching inserting square shaft or welding round shaft.
Polypropylene Manual Air Valve
(3) The dispatching valve is divided into manual and electric. According to the materials used, it is divided into four types: carbon steel plate, galvanized plate, aluminum alloy plate, and stainless steel plate. The valve body structure and specifications are the same.
The characteristics of the polypropylene PP 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.
The scope of application of the polypropylene PP air valve
It is widely used in industrial, mining, and civil building HVAC systems to accurately schedule airflow. It is one of the key pieces of 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 polypropylene PP air valves for different occasions and needs.
