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 TWT® Is the Right Manufacturer to Supply the Offset Butterfly Valve to You
For over six decades, Tianjin Tanggu TWT Valve Co., Ltd. (TWT®) 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 TWT 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.
Choosing between a gate valve and a butterfly valve can be tough. Both serve unique purposes and optimize system performance. This article examines their differences, features, and advantages. We’ll look at the DN800 butterfly valve and BS5163 gate valve PN16. Also, we’ll discuss butterfly valves in exhaust systems. Make an informed choice for your needs.
Gate Valve: A gate valve employs a gate-like disc to block or allow flow. It lifts the gate with a multi-turn handwheel, ensuring minimal pressure drop when open.
Butterfly Valve: A butterfly valve controls flow with a rotating disc and quarter-turn mechanism. This makes opening and closing quicker. It can also partially open to regulate flow.
2. Flow Regulation
Gate Valve: Ideal for on/off applications. It cannot regulate flow effectively due to potential turbulence and wear when partially open.
Butterfly Valve: Suitable for both on/off and flow modulation. Its disc can be partially opened to throttle flow.
3. Pressure and Size
Gate Valve: Handles higher pressures (up to PN16 or higher) and is preferred for smaller sizes.
Butterfly Valve: Best for larger sizes, such as a DN800 butterfly valve, where space and weight are concerns.
4. Installation and Maintenance
Gate Valve: Needs more space and weighs more. Suitable for bi-directional flow systems and pigging operations.
Butterfly Valve: More compact and lighter, easing installation and maintenance. Yet, its disc can interfere with pigging.
Applications of Gate Valve and Butterfly Valve
Gate Valve Applications
High-pressure systems (e.g., BS5163 gate valve PN16).
Systems requiring zero leakage and bi-directional flow.
Environments with thick fluids or slurries.
Butterfly Valve Applications
Large pipelines, such as a DN800 butterfly valve.
Systems requiring flow modulation or quick shut-off.
Butterfly valve exhaust systems in industrial settings.
Butterfly Valve in Exhaust Systems: Butterfly valves control airflow in exhaust systems with quick operation and a compact design. They are ideal for industrial and automotive uses.
Key Benefits:
Fast Response: Quarter-turn operation enables rapid opening and closing.
Space Efficiency: Compact design fits into tight spaces easily.
Durability: Made from stainless steel, ensuring longevity in harsh conditions.
Material and Standards
Gate Valve
Materials: Ductile iron body, stainless steel stem, and nitrile rubber disc.
Standards: Complies with BS5163, GB/T24924-2010, and ANSI/AWWA C509-94.
Butterfly Valve
Materials: Carbon steel, stainless steel, or aluminum bronze body.
Seat Materials: EPDM, NBR, or Teflon for high-temperature resistance.
Standards: Meets GB, ANSI, and API standards.
Advantages of Each Valve
Gate Valve
High sealing tightness for zero leakage.
Suitable for high-pressure systems.
Long lifespan, up to 50 years.
Butterfly Valve
Compact design saves space and reduces weight.
Cost-effective for large sizes like DN800 butterfly valve.
Quick operation reduces downtime.
Choosing between a gate valve and a butterfly valve depends on your system’s needs. For high-pressure, zero-leakage applications, a BS5163 gate valve PN16 is ideal. For large pipelines or flow modulation, a DN800 butterfly valve is more suitable. In butterfly valve exhaust systems, its quick operation and compact design make it a top choice. Evaluate your requirements to make the best decision!
Get to Know Us and Trust Us
Tianjin Tanggu TWT Valve Co., Ltd. (TWT®), established in 1956, operates in Tianjin Binhai New Area. It leads with modern design, intelligent manufacturing, and a testing center. Specializing in valve development, it produces butterfly valves, semi-ball valves, and more. Over 1000 valve types are available. It has supplied valves for significant projects like the South-to-North Water Diversion and the Three Gorges Power Station. TWT ensures quality and innovation across domestic and international markets, offering comprehensive solutions for diverse industries.
Butterfly valves are widely used in various industries for regulating flow in pipelines. The term “DN200” refers to the nominal diameter of the valve, which plays a crucial role in determining its compatibility with piping systems. In this article, we will explore the specifications, applications, and advantages of DN200 butterfly valves while also discussing related larger sizes such as DN800 and DN2000.
Understanding DN200 Butterfly Valves
1. What Does DN200 Mean?
DN200 refers to a nominal diameter of 200 millimeters (or 8 inches). It represents the inner diameter of the pipeline the valve is designed to fit. This measurement is crucial for ensuring proper flow control and pipeline compatibility.
2. Key Specifications of DN200 Butterfly Valve
Size: 200mm (8 inches)
Material Options: Cast iron, ductile iron, stainless steel, or carbon steel
Pressure Ratings: Common ratings include PN10, PN16, or ANSI 150
Connection Types: Wafer, lug, or flanged
Sealing Mechanism: Soft-seated (EPDM, NBR) or metal-seated for high-temperature applications
3. Applications of DN200 Butterfly Valves
Water Treatment Plants: Used for flow regulation in pipelines
HVAC Systems: Controls air and water flow in heating and cooling systems
Oil & Gas Industry: Helps in managing fluid transport in pipelines
Chemical Processing: Handles corrosive or high-pressure fluids effectively
Considerations for Larger Sizes: DN800 and DN2000 Butterfly Valves
As pipeline diameters increase, the design and construction of butterfly valves become more complex.
DN800 Butterfly Valves: With a nominal diameter of 800 mm, these valves are used in large-scale applications such as municipal water distribution and large industrial facilities. They often come equipped with gear operators or actuators to facilitate operation due to their size.
DN 2000 Butterfly Valves: These valves, measuring 2000 mm in diameter, are utilized in major infrastructure projects, including dams and large water treatment plants. Their design must account for high pressure and flow rates, often incorporating double or triple eccentric designs to ensure reliable performance.
Why Choose a China Valve Manufacturer?
China has become a leading hub for butterfly valve manufacturing, offering cost-effective and high-quality solutions. When selecting a China valve manufacturer, consider:
Quality Certifications: Ensure the manufacturer adheres to ISO, CE, or API standards.
Customization Options: Many manufacturers provide tailored solutions for specific industrial needs.
Competitive Pricing: Chinese manufacturers offer globally competitive prices without compromising quality.
The DN200 butterfly valve is a versatile component used across multiple industries for effective flow control. Understanding its specifications and comparing it with larger sizes like DN800 butterfly valve and DN2000 butterfly valve helps in selecting the right valve for your application. If you’re sourcing valves, working with a reliable China valve manufacturer ensures quality, affordability, and customization for your needs.
