Using eccentric butterfly valves to control fluid in industrial applications has made these equipment very popular because of their effectiveness and the reliability they offer. Being able to differentiate between the various eccentric butterfly valves and ascertain the parameters that need to be checked while making a purchase can indeed improve your operational efficiency. This text will help you understand different types of eccentric butterfly valves, their pros, and some major aspects to consider when you decide to make a purchase.
Understanding Eccentric Butterfly Valves
Eccentric butterfly valves are designed with a unique disc positioning that allows for smooth operation and effective sealing. There are two primary types of eccentric butterfly valves:
Double eccentric butterfly valve: These valves are designed to have two axes with offsets that minimize contact surfaces of the disc with the seat thus significantly reducing the working friction during operation. Due to the double eccentric setup, wear is decreased leading to the longer life of the valve, and sealing performance is improved.
Triple eccentric butterfly valve: This valve, apart from having three offsets, has gone a step further in the design process. This fewer progressive transitions setup increases the sealing performance and they also require fewer torques, i.e., they are more easily operated.
Concentric Butterfly Valve: While not eccentric, it’s worth mentioning that concentric butterfly valves have the disc aligned with the valve body. They are simpler in design.
Advantages of Eccentric Butterfly Valves
The eccentric butterfly valve has such advantages that it is considered the best choice for many industries:
Better Sealing: The construction of eccentric butterfly valves keeps up a reliable barricade against the leakage which leads the liquid to come out of its path and into the environment. The double and triple eccentric versions of the valve are a further improvement on that count of keeping airtightness so that they can be applied to exacting tasks.
Longevity: Eccentric butterfly valves have a fabric position of the disc during the operation that minimizes the contact with the seat. It means that such valves will outlast the wear and tear which follows the frequent operation, resultingly, the number of parts being replaced will be very low and labor will be at a comparative scale.
Flexible Usage: Not only water, but also oil, gases, and chemical substances can be put through eccentric butterfly valves due to their adaptability. In this way, there are various applications such as water purification plants, the chemical industry, and air-conditioning systems where such valves are particularly applicable.
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Key Considerations When Buying Eccentric Butterfly Valves
When purchasing eccentric butterfly valves, keep the following factors in mind:
1. Type of Eccentric Butterfly Valve
For most standard applications, double eccentric valves are the type required, while triple eccentric valves are the choice for high-pressure situations that offer far better sealing than the other types.
2. Material Selection
The valve body and disc material play an important role in the durability and performance of the valve. Basic materials are: ductile iron, stainless steel, and various alloys. For the non-corrosive and non-degrading condition of the media to be handled, the materials must be checked for compatibility with the utilized media.
3. Pressure and Temperature Ratings
The pressure and temperature ratings of the valve should be verified. The valve has to be compatible with the operating conditions of your system. Thus, for example, the DN1800 PN25 eccentric butterfly valve of ours can tolerate high pressures and temperatures and hence is perfect for extreme conditions.
4. Actuation Options
Determine the actuation method that you will be using for the valve. Eccentric butterfly valves can be manual, electric, or pneumatic. The choice of actuator should reflect your operating environment in terms of convenience and efficiency.
5. Standards and Certifications
Confirm that the valve matches the relevant industry standards, including API609, EN593, or BS5155. Compliant valves in this field assure the user of their reliability and efficiency which in turn guarantees the buyer peace.
6. Manufacturer Reputation
Check where a valve is manufactured and if the manufacturer’s reputation in the industry is trustworthy, before you finally decide on a brand. Often trustworthy manufacturers start from experienced ones who have been around for a very long time.
Conclusion
Purchasing the right eccentric butterfly valve involves understanding the different types available and considering key factors such as material, pressure ratings, and actuation options. Whether you choose a double eccentric butterfly valve or a triple eccentric butterfly valve, ensure it meets the specific needs of your application. At Watts Valve Co., Ltd., we offer a wide range of high-quality eccentric butterfly valves designed for optimal performance in various industrial applications. Contact us today and make an informed decision for your fluid control needs!
Offset butterfly valves are a kind of valve used in controlling the flow of gases or fluids. In these valves, the disc is not located at the center but is rather slightly off the centerline. This design is beneficial for the improvement of the sealing performance and it also reduces wear over time. Such valves find their usage in various industrial applications like water treatment, chemical processing, and oil refining. They are known for their reliable shut-off performance, especially with viscous or sticky fluids.
Difference Between the Offset and Double Eccentric Butterfly Valves
Considering the fact that both offset and double eccentric butterfly valves are meant to ensure better sealing and long life yet they differ in structure.
Offset butterfly valves are the ones whose axis is off the center of the disc. This allows the disc to rise slightly off the seat during operation, thus, decreasing friction of the wear process.
Double eccentric butterfly valves adopt the same concept but to a greater extent by making two offsets, the shaft and the disc. Thus, the disc and the seat will have even less contact, which makes the product suitable for high-pressure and high-temperature applications.
Both types ensure top-rated sealing, however, double eccentric butterfly valves are more preferable for heavy-duty tasks like power plants and the heavy industry.
Choosing the Proper Offset Butterfly Valve Size
When one wants to buy an offset butterfly valve, it is highly recommended to acknowledge the next points:
Material: Select cast iron or ductile iron as per the specifications of your project.
Sizes: DN40 to DN1200 (2 to 48 inches) are normal sizes. When it comes to major projects, make sure to pick the DN800 valve type which gives the best flow control.
Pressure Rating: The flange standard you must hunt for is PN10/16 or Class 150 so that the valve stays compatible with your system.
Temperature Range: To deal with the temperature experienced during the normal working conditions, the valve must be capable of functioning from -40°C to 120°C.
Shutoff Performance: Sealed by force designs, especially for the case of sticky or viscous fluids, have a higher degree of tightness.
Check also that the valve adheres to various international quality standards such as CE certification. Long-lasting reliability is only possible through secure high-quality manufacturing and testing processes.
Why FLUID TECH GROUP® Is the Right Manufacturer to Supply the Offset Butterfly Valve to You
For over six decades, Tianjin Tanggu FLUID TECH GROUP Valve Co., Ltd. (FLUID TECH GROUP®) has been the most reliable company in the valve sector. We are proud to be the best butterfly valve supplier in China. Our products are recognized for their longevity, precision, and their compliance with international standards.
We have a huge variety of offset butterfly valves for different industries use including water supply, chemical processing, and energy production. Our valves are mainly made by casting iron and ductile iron, which guarantees their strength and good performance under corrosion.
We also specialize in the production of double-eccentric butterfly valves to serve clients who are looking for the advanced sealing and performance under harsh conditions. All our valves are subjected to high-quality control and testing in our high-tech facilities. In the event that a DN800 butterfly valve is your choice or if you have a custom design in mind, we will provide the right products for you and deliver it to your place on time.
We offer full expert support at every stage from the selection to the installation of the product. This means that we are aware of the importance of the proper delivery and good customer service.
Summary and Our Service Promise
Basically, the offset butterfly valves are the necessary or basic things in many industrial systems. They convey the most efficient flow control and the best shut-off performance.
In summary, offset butterfly valves are essential components in many industrial systems. They provide efficient flow control and tight shut-off performance.
At FLUID TECH GROUP Valve, we combine decades of experience with cutting-edge technology to manufacture high-quality valves that meet global standards. We serve customers worldwide and have contributed to major infrastructure projects such as the South-to-North Water Diversion Project and the Three Gorges Dam.
Our commitment to excellence ensures that every product we deliver is built to last. As a leading butterfly valve supplier, we are ready to support your next project with reliable products and exceptional service.
Contact us today to learn more about our offset butterfly valves and how we can help you find the right solution for your application.
In the 1930s, the Americans invented the butterfly valve, and then it was introduced to Japan in the 1950s, and it was widely adopted in Japan in the 1960s, and it was promoted in China in the 1970s. Although China began to invest in research and production in the field of butterfly valves is not very early, but the speed of development is very high, and the results of development are also very rich. At the beginning, the butterfly valve mechanism is basically based on the middle line butterfly valve, with the improvement of the process and the butterfly valve has been widely used in various fields of the industry, which also makes the demand for the butterfly valve in the industry increased: high temperature resistance, high performance and so on. Demand driven creation, through the efforts of Chinese manufacturers, the performance of the butterfly valve has been further improved, creating a wider range of temperature and pressure, reliable sealing performance, and longer service life of the butterfly valve. Double eccentric butterfly valve is improved on the basis of single eccentric.
As China’s current first-class double eccentric butterfly valve manufacturer, today FLUID TECH GROUP wants to talk about double eccentric butterfly valve in detail.
Double eccentric butterfly valves’ improvement process
In order to solve the problem of squeezing the butterfly plate and the seat of the concentric butterfly valve, a single eccentric butterfly valve is first produced, and its structural characteristics are: the stem axis deviates from the center of the butterfly plate. Although this improvement reduces the friction to a certain extent, but the effect is not much better, double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve, is currently more widely used butterfly valve, its structural characteristics are: the stem axis deviates from the center of the butterfly plate, but also deviates from the center of the body.
This improvement of the double eccentric butterfly valve greatly eliminates the unnecessary excessive extrusion and scraping phenomenon of the butterfly plate and the seat, reduces the opening resistance, reduces the wear, and improves the life of the seat, so the double eccentric butterfly valve is called a high-performance butterfly valve.
Double eccentric butterfly valve’s working mode
Double offset high performance butterfly valve is mainly composed of valve body, valve plate, valve core, valve seat, valve cover, support rod, shaft head, cover, detector, gasket body and other components.In normal operation, the pressure between the two outlets of the valve body is very small, when the fluid flows, the valve will automatically open to let the fluid flow through; When the fluid is stopped, the valve automatically closes, blocking the fluid flow.
Material of double eccentric butterfly valve
Double eccentric butterfly valves can also use metal seats, which improves the application of butterfly valves in high temperature fields. However, because its sealing principle is a position sealing structure, that is, the sealing surface of the butterfly plate and the seat is in line contact, and the elastic deformation caused by the butterfly plate squeezing the seat produces a sealing effect, so the closing position is very demanding (especially the metal seat). Therefore, ductile iron seats are common in double eccentric butterfly valves.
Double eccentric butterfly valve has the characteristics of good sealing, small flow resistance, corrosion resistance, etc., so it is widely used in the following fields:
Chemical industry
Metallurgical industry
Power industry
Oil and natural gas industry
Food and pharmaceutical industries
If you happen to need a double eccentric butterfly valve, please contact FLUID TECH GROUP,China, we will provide the best quality and the most sincere service.
Sealing Mechanism:
The main difference between double eccentric butterfly valves and soft sealing butterfly valves lies in their sealing mechanisms. Double eccentric valves achieve sealing through metal-to-metal contact between the disc and the seat.
Pressure and Temperature Ratings:
Double eccentric butterfly valves are designed to handle higher pressures and temperatures compared to soft sealing butterfly valves.
Operating Torque:
Double eccentric butterfly valves typically have lower operating torques due to their eccentric design.
