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The company actively participates in the Belt and Road economic construction initiated by the country, and its products are exported to more than 30 countries and regions such as Europe, North America, the Middle East, Southeast Asia, and Africa. High-quality products and fast after-sales service have won praise and trust from customers at home and abroad.
Rich experience
The company's founder team graduated from mechanical and electrical automation majors and has been engaged in the valve industry for more than 20 years. After years of hard work and development, it has become a key backbone enterprise in the valve industry. It specializes in improving the innovation and manufacturing capabilities of special valves in harsh industrial environments.
Wide product range
The company mainly produces API 6D pipeline ball valves, gate valves, globe valves, check valves, plug valves and API 609 series butterfly valves in 6 categories, with more than 1,000 specifications and varieties. Products widely cover petrochemical, coal chemical, nuclear power, LNG, marine, aerospace, metallurgy, papermaking and other industries.
Complete qualifications
The company has a complete international standardized management system, adopts the world's top precision casting technology and modern intelligent electronic detection system, and uses advanced SAP resource management, strip storage management system and ERP system to effectively manage the factory.
Butterfly valves are used for large-scale processing applications that require quick, leak-proof opening and closing. A bi-offset butterfly is a type of butterfly valve specially engineered to fix the shortcomings of other butterfly valve types. By design, it is the highest level of butterfly valves and can work in any type of processing, including high-pressure and high-temperature environments other butterfly valves just can't handle.
Reduced Wear and Tear
The design of the double offset butterfly valve significantly reduces wear and tear on the valve seat and disc.
The offset shaft and cone-shaped sealing mechanism allow for a tight seal with minimal friction during operation, contributing to increased durability.
Lower Operating Torque
Compared to the traditional butterfly valve, the double offset design requires lower operating torque.
This means that the valve can be easily and efficiently actuated, making it suitable for applications where lower torque requirements are advantageous.
Extended Service Life
The reduced friction and wear, combined with lower operating torque, contribute to an extended service life for double-offset butterfly valves.
This makes them a cost-effective choice in the long run, as they require less frequent maintenance and replacement.
Enhanced Sealing Performance
The double offset configuration improves the sealing performance of the valve.
The offset shaft allows the disc to move away from the seat rapidly during the initial opening, minimizing contact and reducing wear.
This results in improved sealing integrity over time.
Versatility in Applications
Double offset butterfly valves are versatile and find applications in various industries, including oil and gas, petrochemical, water treatment, and more.
Their ability to handle high pressures and temperatures makes them suitable for diverse operating conditions.
As the name suggests, double offset butterfly valves have two stems offset from the centre. A triple offset butterfly valve has three. Two of which are placed in a similar position to the double offset butterfly valve, while the third is the geometry of the seating surface. This creates a cone shape between the disc and seat.
Triple offset valves are used in similar industries as double offset valves, except in more demanding applications. Double offset valves experience friction at the first 10° of opening and last 10° of closing. The third offset ensures the disc and seat are not in contact until the last 1° of closing, allowing virtually frictionless operation.
One of the fundamental maintenance practices for butterfly valves is regular inspection. It is essential to visually inspect the valve body, disc, stem, and any associated components for signs of wear and tear. Any visible chips, cracks, or corrosion should be addressed immediately, as they can compromise the valve's functionality and fluid control capabilities. Additionally, proper lubrication is crucial to ensure smooth operation and prevent unnecessary friction.
Proper cleaning and flushing are vital for the efficient operation of butterfly valves. Over time, fluid residues, debris, and sediment can accumulate inside the valve, leading to potential blockages and reduced flow rates. Routine cleaning and flushing using appropriate cleaning agents and techniques are imperative to prevent such issues.
By comparison, should exhaust butterfly valves remain stuck open, engines will start to slow as the gas-air mixture will be too rich. Unless valves are calibrated to accommodate a balanced fuel mixture, unburned gasoline will slosh around inside the cylinders, causing other vehicle components to foul.
To close the valve, apply a solution of alcohol mixed with powdered graphite to serve as a lubricant for the shaft. Should this not take, spray with a solvent that removes rust, as this will penetrate areas that the makeshift lubricant can't reach.
As a general rule of thumb for servicing exhaust butterfly valves, do not lubricate with any kind of oil. If a lubricant is required, stick to the solution above as even the thinnest oil types will make the valve seize and seal tighter than before, in either open or closed positions.
Common installation errors include incorrect alignment, improper torque application, and poor gasket positioning, all of which can contribute to leakage and other operational problems. Misaligned valves can cause uneven wear on components, eventually leading to leaks or even valve failure. Applying inappropriate torque can result in damaged or deformed valve components, compromising their ability to create a tight seal and leading to leakage. Poor gasket positioning or selection can also hinder the sealing capability of the valve, allowing fluid or gas to escape.
To prevent leakage due to improper installation, it's essential to carefully follow installation instructions, use appropriate tools and equipment, and employ trained personnel for the task. Regular inspections and maintenance can help identify and address any installation-related issues before they escalate into more significant problems, ensuring the reliable and efficient operation of butterfly valves in various industrial applications.
To make a proper comparison, we need to understand the technology behind both. The rubber-lined butterfly valve bodies are typically cast iron or ductile iron. High-performance valves do have the option for ductile iron but are primarily utilized with cast steel (or SS) bodies. The rubber-lined valves have a rubber-lined boot that acts as its seat. That boot is fitted and glued into the body of the valve. These rubber liners are sensitive to chemicals and have a shorter life expectancy (hardening and cracking over time).
The high-performance butterfly valves utilize polymeric seats which have an infinite life expectancy and a very high chemical - resistance very few chemicals are known to affect the fluorocarbon-based polymers which makes these products attractive to an industrial valve application.
Butterfly valves work as throttling devices by controlling the flow of fluids through a circular disc or plate positioned in the path of the flow. The disc is mounted on a shaft that is rotated by a handle or actuator, allowing the disc to be positioned at different angles to the flow path.
When the disc is in a fully open position, the fluid flows through the valve with minimal resistance. However, when the disc is partially closed, the fluid encounters a smaller opening, creating a more significant pressure drop and reducing the flow rate.
However, butterfly valves are only effective for throttling when properly designed and selected for the specific application. Not all butterfly valve designs are created equal, so it's important to consider the available options to ensure optimal performance.
On the other hand, double eccentric butterfly valves, offer much better flow regulation thanks to their unique build. With a reduced risk of seat set or deformation and a design that prevents valve rubbing on the resilient seat until the last 10% of closure, it's an ideal choice for throttling applications.
Something to always be aware of, is that when using a butterfly valve for throttling, the chances of cavitation increase due to the design of the valve. When high pressure and velocities pass through the valve to the other side of the disc, we run into the possibility of cavitation and this should be considered when selecting the correct valve for your application.
SUNAY is a professional manufacturer of valves. Headquartered in Anfeng Industrial Zone, Yongjia, Zhejiang. The company was established in 2010 with a registered capital of 10.8 million yuan and has three holding manufacturing companies. The company mainly produces API 6D pipeline ball valves, gate valves, globe valves, check valves, plug valves and API 609 series butterfly valves in 6 categories, with more than 1,000 specifications and varieties.
The company insists on taking scientific and technological innovation as the forerunner of enterprise development, setting up AUTO CAD valve design center, 3D simulation manufacturing design system, valve testing center and special equipment valve test platform.
The company actively participates in the Belt and Road economic construction initiated by the country, and its products are exported to more than 30 countries and regions such as Europe, North America, the Middle East, Southeast Asia, and Africa. High-quality products and fast after-sales service have won praise and trust from customers at home and abroad.
The company adheres to the enterprise spirit of "harmony, humility, truth-seeking, pragmatism, and innovation", and the market-centric business philosophy, and continues to provide customers with the most complete services.
We're well-known as one of the leading bi-offset butterfly manufacturers and suppliers in China. We warmly welcome you to buy or wholesale customized bi-offset butterfly at competitive price from our factory. Contact us for more details.
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