What are the types of pneumatic butterfly valves? And how does it work?

Which is the best manufacturer of valves in Shanghai? There are many valve manufacturers in Shanghai, specifically which one is the best, in fact, it is very difficult, this depends on where you can evaluate it conveniently, each manufacturer produces different valve products, and the fields involved are also very different, for example, some are doing water systems, some are doing industrial systems, and industrial systems are divided into many fields, such as: electric power, chemical industry, petroleum, pharmaceuticals and many other fields.

Here is a brief introduction to a few companies, Shanghai Qizhong valve in the field of water system, Suzhou Neway valve, Shanghai Guanlong valve this unit is not bad, industrial valve field can also be.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be one of the top brands in the valve industry: water system valves and industrial valves The following more influential first-line brands can be used as a reference, and the following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only:

Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Suyan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

Double-acting, single-acting. Specifically, it can be a double-acting and single-acting principle.

Abstract:The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve, and the working principle is to use compressed air to push multiple groups of combined pneumatic pistons in the actuator to move, so as to play the role of a valve. When adjusting, compared with the manual butterfly valve will be more complicated, if the pneumatic butterfly valve is adjusted, it needs to be combined with the analog signal of the electric control cabinet, set to the corresponding angle below to complete the adjustment, and then with me to understand what is the working principle and structure of the pneumatic butterfly valve and what are the adjustment methods of the pneumatic butterfly valve.

1. What is the working principle and structure of pneumatic butterfly valve?

1. The working principle of pneumatic butterfly valve.

Use compressed air to push multiple groups of combined pneumatic pistons in the actuator to move, transmit force to the characteristics of the beam and the inner curve track, drive the hollow core spindle to rotate, and the compressed air disc is transmitted to each cylinder, change the inlet and outlet position to change the direction of rotation of the spindle, and adjust the number of cylinder combinations according to the requirements of the rotation torque required by the load (valve) to drive the load (valve) to work.

2. The structure of the pneumatic butterfly valve.

The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve, which is a conventional butterfly valve preferred for pipelines, with a simple structure, a small flow resistance coefficient, and a straight flow characteristic. It has the advantages of light weight, easy installation and small driving torque. Due to the advantages of pneumatic butterfly valve structure, it can be used not only for cutting off the medium, but also for adjusting the flow rate of the medium.

The sealing ring of the valve body is divided into nitrile rubber and PTFE rubber, and the leakage can reach zero. The selection of parts of different materials and the use of sealing rings of different materials can adapt to different media and working conditions, so that the cost and performance can achieve optimal results.

Because of the structural characteristics of the pneumatic butterfly valve, it is suitable for temperature 120 or 150, nominal pressure Water supply and drainage, sewage and blind water, food, heating, gas, shipbuilding, hydropower, metallurgy, energy system and textile industries, especially suitable for high leakage requirements, corrosive occasions, as a flow adjustment and interception medium.

2. What are the adjustment methods of pneumatic butterfly valves?

1. The adjustment of the pneumatic butterfly valve should be carried out according to its performance

1. If it is a switch-type ascending pneumatic butterfly valve, it is only necessary to debug the valve plate of the butterfly valve to the correct position before the installation of the pneumatic actuator, and wait for the installation of the pneumatic actuator, limit switch and solenoid valve to test the switch effect with air source.

2. If the pneumatic butterfly valve is an adjustable type, it needs to be combined with the analog signal of the electric control cabinet and set to the corresponding angle.

3. If the pneumatic butterfly valve is intelligent, it is necessary to add the PLC part, combine the signal of the electric control cabinet for programming, and visualize the results.

1.Structural characteristics of butterfly valve: ordinary butterfly valve structure, mainly composed of valve body, valve plate, transmission parts and actuator, with a disc-shaped valve plate reciprocating about 90° to open, close or regulate the fluid.

2.The outstanding features are small size, light weight and small installation size.

3.When the butterfly valve is fully opened, the flow resistance is small, and when it is opened between about 15° and 70°, it can carry out sensitive flow control, showing approximate logarithmic flow characteristics.

4.The ordinary butterfly valve has a large discharge rate, and the improvement of the butterfly valve mainly revolves around reducing the leakage of the valve.

Pneumatic butterfly valve is a pneumatic and electric system control component mainly used in food, chemical, electric power and petroleum industries. The pneumatic butterfly valve controls the circular butterfly plate inside through the valve stem, so as to realize the function of starting and regulating the flow of media. At present, pneumatic butterfly valves are mainly used in low-pressure large-mouth pipes, and are divided into stainless steel pneumatic butterfly valves, carbon steel pneumatic butterfly valves, etc. according to different materials.

Let's introduce the internal principle of the pneumatic butterfly valve. 

The principle of the pneumatic butterfly valve

Pneumatic butterfly valves can control the pressure, flow and direction of airflow in the pneumatic system, ensuring that the internal actuating elements and systems can work properly. The pneumatic butterfly valve is composed of pneumatic actuators and butterfly valves, brackets, cylinders, valve bodies, valve stems and other parts. The actuator of the pneumatic butterfly valve uses the single-acting and double-acting working principle respectively, and the single-acting working principle is to return through the gas closing spring, which is suitable for open or normally closed type.

The double-acting working principle is a gas switch action, which is suitable for the adjustment type.

Pneumatic butterfly valve is an element in the pneumatic system, it adopts a spherical shape, the internal compressed air is used as the power source, and the pneumatic actuator is driven by the solenoid valve reversal, and then the pneumatic actuator drives the valve switch.

The internal structure of the pneumatic butterfly valve is relatively simple, and when the operator rotates it 90 degrees, it can be quickly started and closed. The pneumatic valve has good fluid control characteristics, when the inside of the butterfly valve is fully opened, the thickness of the iron plate will produce a certain resistance to the flow of the internal ring, as long as the pressure of the valve is reduced. The solenoid exhaust outlet of the pneumatic butterfly valve is equipped with a muffler to reduce noise.

The valve positioner is the main accessory of the pneumatic valve. The main function of the valve positioner is to amplify and adjust the control in proportion, the valve positioner and the pneumatic butterfly valve form a complete structure, one of the two as a gas volume element, one as a hysteresis element, to jointly complete the start adjustment control.

Pneumatic butterfly valves are small and lightweight, easy to disassemble and maintain, and can be installed in any position. It has a trend line with flow characteristics and good regulation performance; The internal seals can be replaced, so that two-way sealing can be realized. Pneumatic butterfly valves are also very versatile in their actuation methods, with the option of manual, electric or pneumatic.

Finally, Tuba Rabbit reminds everyone that after the installation of the pneumatic valve, it should be installed and debugged. The staff must manually operate the solenoid valve, and then observe the opening and closing state of the pneumatic butterfly valve, if the valve is a little difficult, the stroke of the cylinder should be adjusted to a small amount until the valve starts and closes smoothly and without leakage.

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1. Structural characteristics of butterfly valve: The structure of ordinary butterfly valve is mainly composed of valve body, valve plate, transmission parts and actuator, and the disc valve plate is reciprocated by about 90° to open, close or mediate the fluid. The outstanding features are small size, light weight and small installation size.

2. When the butterfly valve is fully opened, the flow resistance is small, and when it is opened, it can be between 15° and 70°, and it can carry out sensitive flow control, showing approximate logarithmic flow characteristics. The discharge volume of ordinary butterfly valve is large, and the improvement of the main wheel plexus of butterfly valve is carried out around reducing the leakage of the valve.

Introduction: Usually everyone may have less understanding of electric butterfly valves, because there is less contact, so there is not much understanding, but the application of electric butterfly valves is indeed more and more extensive. Today, let me take you to have an in-depth understanding of the electric butterfly valve.

Look at what kind of characteristics he has.

Introduction to electric butterfly valves

Electric butterfly valves have a very good development situation at present, and now there are many well-known enterprises producing electric butterfly valves. Electric butterfly valve is more and more widely used in our lives, with its development, its product performance is getting better and better, and the after-sales service is becoming more and more perfect, so it is highly praised and favored by our customers.

There are two types of connection methods for electric butterfly valves: flange type and clamp type. Its connection method plays a very important role in the field of industrial automation. As long as the application field of electric butterfly valve is:

Textile, petrochemical, pharmaceutical, shipbuilding, light industry, power station and so on. Shut-off valves, check valves, and control valves in the piping system can all be done with electric butterfly valves. Electric butterfly valves have strict quality requirements, so they can have a long trial period.

In the metallurgical steel and marine industries, electric butterfly valves have a very high reputation.

In situations where flow regulation is required, an electric butterfly valve is very necessary. In the selection of electric butterfly valves, it is enough to consider many aspects, not only to consider the influence of the pressure of the pipeline system on the electric butterfly valve, but also to consider the pressure of the pipeline medium that the butterfly plate can withstand in the closed state, and the working temperature that the elastic valve seat can withstand at high temperatures should also be taken into account. The length and overall height of the electric butterfly valve are relatively small, and it has very good flow performance.

When the electric butterfly valve is used to control the flow, it is necessary to carefully select the type and size of the butterfly valve, so as to ensure that the electric butterfly valve can give full play to its advantages and work.

Electric butterfly valve features:

1. The sealing performance is very reliable, and the double eccentric structure is adopted, so that it can be tighter and tighter.

2. Stainless steel and nitrile oil-resistant rubber are used as secondary raw materials for sealing, so his service life is relatively long.

3. The sealing rubber ring can be placed in different positions and can be used in different media, so that customers can choose according to their own wishes.

4. The butterfly plate adopts a frame structure, which has a large flow area, good strength, and less resistance during circulation.

5. The electric butterfly valve is small in size, light in weight, and very simple to match, which is suitable for those gas and liquid disturbances where the medium is relatively clean.

After the introduction, we have a further understanding of the electric butterfly valve and a more comprehensive understanding. The application of electric butterfly valve has become more and more extensive, and it is believed that it will have a good development prospect.

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The electric butterfly valve opens relatively slowly, while the pneumatic one is faster, and the pneumatic input is relatively large.

1.Under the condition of gas source, pneumatic butterfly valve is preferred, especially for the medium is combustible gas and coal gas, so as to require rapid opening and closing of the valve ventilation butterfly valve. Pneumatic butterfly valve actuator can choose double-acting and single-acting, single-acting pneumatic valve, and the valve can be normally open or normally closed, and the spring mechanism inside the actuator will automatically reset when the air source is out of air, so as to automatically open or close the valve, which is suitable for special working conditions with high safety requirements.

2.The electric butterfly valve has a large power torque, manual and electric dual-purpose operation, a high degree of automation, and can be remotely controlled through the control box and PLC, and has been widely used in industrial pipeline control in chemical, metallurgical, petroleum and other industries.

The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve. Pneumatic butterfly valve is a pneumatic valve that uses a circular butterfly plate that rotates with the valve stem to open and close to achieve the enabling action, mainly used as a shut-off valve, and can also be designed to have the function of adjusting or section valve and regulation, and the butterfly valve is currently used more and more in low-pressure large and medium-diameter pipelines. Pneumatic butterfly valve classification:

Stainless steel pneumatic butterfly valve, hard seal pneumatic butterfly valve, soft seal pneumatic butterfly valve, carbon steel pneumatic butterfly valve. The main advantages of pneumatic butterfly valve, simple structure, small size, light weight, low cost, pneumatic butterfly valve is particularly significant, installed in the high-altitude dark channel, easy to control and operate through two-position five-way solenoid valve, and can also adjust the flow medium.

Pneumatic Flanged Butterfly Valve, Pneumatic Flanged Butterfly ValveThis product is composed of rubber sealed butterfly valve and carbon steel or stainless steel valve plate and valve stem. It is suitable for temperature 80 120 such as food, chemical industry, petroleum, electric power, textile, papermaking and other water supply and drainage, gas pipelines to regulate the flow and intercept the medium.

Pneumatic regulating butterfly valve is a kind of valve (valve plate) rotating around a fixed shaft perpendicular to the channel, which is composed of a piston double-acting or single-acting (spring-return) pneumatic actuator and a butterfly valve, which is a rotating high-performance regulating or shut-off valve, with electricity, air valve positioner or solenoid valve, air filtration pressure reducer, limit switch (valve position feedback device), which can realize the proportional adjustment and two-position cut-off control of the fluid medium in the process pipeline, so as to achieve the flow, pressure, temperature, Automatic control of parameters such as liquid level.

Pneumatic clamp-type butterfly valve, novel structure, short-distance clamp-type structure formed by the valve body structure to meet the narrow pipeline space, zero external leakage, internal leakage in line with national standards.

Pneumatic rubber-lined butterfly valve, the connection method has flange, clamp, and the seal is lined with nitrile rubber, ethylene propylene rubber, heat-resistant ethylene propylene rubber, natural rubber, neoprene, fluorine rubber, PTFE, according to the chemical properties of the medium has a more reasonable choice.

Pneumatic fluorine-lined butterfly valve, anti-corrosion fluorine-lined butterfly valve adopts a two-piece valve body combination, the valve seat and the valve body lining are integrated, when the valve is working, only the all-plastic valve seat and the plastic-lined butterfly plate are in contact with the medium, and the product can withstand any medium corrosion except for molten alkali metal and elemental fluorine, in which the D71F46 valve stem and the butterfly plate (forging) are integrated, and the surface is evenly coated with a layer of FEP. The inner surface of the valve body channel is smooth, the fluid resistance is small, the CV value is high, the flow capacity is strong, the torque is moderate, the four-stage sealing structure is adopted, and the sealing surface is equipped with the elastic gasket seat of temperature-resistant and anti-aging SI rubber, which completely achieves zero leakage of the medium.

Pneumatic ventilated butterfly valve, featured, with a thin slit between the valve plate seats, the product is suitable for use in environments with poor air circulation.

The main characteristics of pneumatic telescopic butterfly valve are as follows: novel design, reasonable design, unique structure, light weight, convenient operation, fast opening and closing; In addition to the function of adjusting and intercepting the flow and compensating for the thermal expansion and contraction caused by the temperature difference of the pipeline, the telescopic butterfly valve can also provide convenience for the installation, replacement and maintenance of the valve. The sealing part can be adjusted and replaced, and the sealing performance is reliable.