Butterfly Valves

Centerline butt-clamp soft seal butterfly valve, double eccentric flanged butterfly valve compact structure, 90 ° rotary switch easily, reliable sealing, long service life, is widely used in water mills, power plants, steel mills, papermaking, chemical industry, catering and other systems of water supply and drainage, as a regulator and cut-off use.

Butterfly valve, referred to as butterfly valve (butterfly valve), refers to the closing member (valve flap or butterfly plate) for the disk, rotating around the valve axis to achieve the opening and closing of a kind of valve, in the pipeline is mainly used for cutting off and throttling. Butterfly valve opening and closing member is a disc-shaped butterfly plate, rotating around its own axis in the valve body, so as to achieve the purpose of opening and closing or regulation. Butterfly valve full open to full closed is usually less than 90 °, butterfly valve and butterfly stem itself does not have the ability to self-locking, in order to the positioning of the butterfly plate, to be installed on the valve stem worm gear reducer. The use of worm gear reducer, not only can make the butterfly plate with self-locking ability, so that the butterfly plate stops in any position, but also improve the operating performance of the valve.

The characteristics of industrial special butterfly valve can withstand high temperature, the applicable pressure range is also higher, the valve nominal diameter is large, the valve body is made of carbon steel, the sealing ring of the valve plate is made of metal ring instead of rubber ring. Large high-temperature butterfly valves are made of welded steel plate and are mainly used for high-temperature medium flue gas ducts and gas pipelines.

Classification by structure form
(1)Center Sealed Butterfly Valve

(2)Single Eccentric Sealed Butterfly Valve
(3) double eccentric seal butterfly valve

(4) three eccentric seal butterfly valve

According to the sealing surface material classification
(1) soft seal butterfly valve:
1) sealing vice by non-metallic soft material to non-metallic soft material composition.
2) sealing vice by metal hard material to non-metallic soft material composition.
(2) metal hard seal butterfly valve: sealing vice by metal hard material to metal hard material composition.

Classification by sealing form
(1) forced seal butterfly valve
1) elastic seal butterfly valve. Seal specific pressure by the valve plate extrusion valve seat when the valve is closed, the valve seat or valve plate elasticity generated.
2) external torque seal butterfly valve. Sealing pressure is generated by the torque applied to the valve shaft.
(2) Pressurized seal butterfly valve. The sealing specific pressure is generated by the valve seat or valve plate on the poppet sealing element filling pressure.
(3) Automatic sealing butterfly valve. Sealing pressure is automatically generated by the medium pressure.

Classification by working pressure
(1) vacuum butterfly valve. Working pressure below the standard pile of atmospheric calendar butterfly valve.
(2) low pressure butterfly valve. Nominal pressure PN <1.6MPa butterfly valve.
(3) medium pressure butterfly valve. Nominal pressure PN 2.5 - 6.4MPa butterfly valve.
(4) high-pressure butterfly valve. Nominal pressure PN 10.0 - 80.0MPa butterfly valve.
(5) ultra-high pressure butterfly valve. Nominal pressure PN>100MPa butterfly valve.

Classification by operating temperature
(1) high temperature butterfly valve. t>450 C butterfly valve
(2)Medium temperature butterfly valve. 120 C<t<450 ℃ butterfly valve.
(3) Normal temperature butterfly valve. A 40 C<t<; 120 C butterfly valve.
(4) Low temperature butterfly valve. A butterfly valve of 100 <t< a 40 C.
(5) Ultra-low temperature butterfly valve. t< a 100 C butterfly valve.

(1) Butterfly valve.

The butterfly plate of the butt-clamp butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, the angle of rotation between 0 ° - 90 °, rotated to 90 °, the valve is fully open state.

Butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. And only need to rotate 90 ° can quickly open and close, simple operation, at the same time the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valve has two types of sealing: elastic seal and metal seal. Elastic seal valve, the seal can be set in the valve body or attached to the butterfly plate around.

(2) flanged butterfly valve.

Flanged butterfly valve for vertical plate structure, the valve stem for the integral metal hard seal valve sealing ring for flexible graphite plate and stainless steel plate composite structure, mounted on the valve body, butterfly plate sealing surface surfaces welded stainless steel. The sealing ring of the soft seal valve is made of nitrile rubber, which is installed on the butterfly plate.

(3)Lug type butterfly valve.

(4) Welded butterfly valve.

Welded butterfly valve is a non-closed type butterfly valve, widely used in building materials, metallurgy, mining, electric power and other production processes, the medium temperature ≤ 300 ℃ nominal pressure of 0.1Mpa pipeline, used to connect, open and close or adjust the amount of media.

Clamped soft seal butterfly valve main shape connection size Unit: mm

What is a Butterfly Valve Used For?

A butterfly valve is a type of quarter-turn valve that utilizes a rotating disc to regulate fluid flow. Its design incorporates various features that make it suitable for specific applications in various industries, including water supply, wastewater treatment, chemical processing, and HVAC systems. Understanding the functionalities and advantages of a butterfly valve can help you make informed decisions on its use in different scenarios.

One primary purpose of a butterfly valve is to control the flow of liquids and gases. The disc within the valve pivots around a central axis, allowing for quick and efficient operation. This quarter-turn mechanism is particularly advantageous when rapid adjustments to flow rates are needed. For instance, in water treatment plants or industrial applications where precise control is crucial, a butterfly valve can serve as an effective solution.

Furthermore, butterfly valves are recognized for their lightweight and compact design. Compared to other types of valves, they occupy less space, making them ideal for installations in tight spaces or when weight considerations are critical. Whether in pipelines or confined areas, a butterfly valve's minimalist design allows for versatility without sacrificing functionality.

Another significant application of a butterfly valve is in system isolation. By fully closing the disc, the valve creates a tight seal that prevents fluid flow. This is particularly useful in maintenance scenarios where isolating sections of a pipeline is necessary. The ability to quickly and reliably cut off flow makes butterfly valves an essential component in controlling systems and ensuring safety in various industrial processes.

In summary, a butterfly valve is employed in numerous applications to regulate flow, isolate systems, and enhance operational efficiency. Its compact design, quick operation, and reliability make it a popular choice in many industries. Understanding what a butterfly valve is used for will enable you to appreciate the critical role it plays in fluid control and management. Whether you're involved in engineering, maintenance, or industrial design, having a solid grasp of butterfly valve applications will serve you well in your professional endeavors.

The Advantages of Butterfly Valves

One significant advantage of butterfly valves is their compact design. Unlike traditional valves that tend to be bulky, butterfly valves consist of a simple disc mounted on a shaft. This streamlined structure allows for installation in tight spaces, making them an ideal option for projects with limited room for equipment. Additionally, their lightweight nature reduces the overall weight of piping systems, leading to easier handling and installation.

Another critical benefit of butterfly valves is their quick operation. The design facilitates rapid opening and closing, with a rotation of only 90 degrees required for full movement. This feature is particularly valuable in applications where timely control of flow is paramount, such as in water treatment facilities or chemical processing plants. The swift responsiveness of butterfly valves contributes to enhanced operational efficiency and reduced downtime.

Moreover, butterfly valves offer excellent flow regulation. When partially opened, these valves can create a streamlined flow path while effectively controlling the media passing through. This characteristic is essential in applications where precise flow management is crucial, allowing for consistent system performance.

Butterfly valves also exhibit durability and low maintenance needs. Constructed from robust materials like stainless steel or PVC, they are resistant to corrosion, making them suitable for various substances, including aggressive chemicals and corrosive environments. Their simple mechanism reduces the likelihood of mechanical failure, further minimizing maintenance requirements and operational costs.

Finally, the adaptability of butterfly valves makes them suitable for diverse applications across different industries. From HVAC systems to water supply and wastewater treatment, these valves can handle a wide range of fluids, enhancing their utility across multiple fields.

What Is the Difference Between a Gate Valve and a Butterfly Valve?

Operating Mechanism

The primary difference between gate valves and butterfly valves lies in their design and operating mechanisms. A gate valve utilizes a linear motion to lift or lower a gate to control the flow. This mechanism is ideal for on-off control but does not perform well in throttling applications. Conversely, a butterfly valve comprises a rotating disc that pivots around a central shaft to regulate flow. This design allows for quick operation and is particularly effective in throttling.

Flow Control and Efficiency

Another critical distinction is the flow characteristics. Butterfly valves are known for their ability to provide a consistent flow rate with minimal pressure drop. This efficiency is highly advantageous in large-volume applications and where space is limited. In contrast, gate valves are less efficient in throttling and can create turbulence, leading to a performance deficit in high-flow scenarios.

Space and Weight Considerations

Butterfly valves are generally more compact and lighter than gate valves. This space-saving design makes butterfly valves suitable for installation in tight spaces, where traditional gate valves may prove cumbersome. The reduced weight of butterfly valves simplifies handling during installation and maintenance.

Application Suitability

Both valve types have specific applications where they excel. Gate valves are typically used in applications requiring minimal pressure loss and where full isolation is paramount. Conversely, butterfly valves are favored in systems requiring quick operation and frequent flow adjustments, making them ideal for HVAC systems, water distribution, and wastewater treatment.

What Are the Three Types of Butterfly Valves?

1. Concentric Butterfly Valves 

Concentric butterfly valves are characterized by their simple design, where the disc is aligned eccentrically with the valve body. In this configuration, the disc rotates around an axis that lies parallel to the flow of fluid. Concentric butterfly valves are primarily used in low-pressure applications, making them ideal for water and wastewater treatment. Their straightforward design allows for efficient flow control and minimal pressure drop, which ensures optimal performance in various settings.

2. Eccentric Butterfly Valves

Eccentric butterfly valves, also known as high-performance butterfly valves, feature a unique design that allows the disc to be offset from the valve seat. This design improves sealing capabilities and reduces wear on the valve components. Eccentric butterfly valves are well-suited for more demanding applications, including those involving higher pressures and temperatures. They excel in services such as the handling of slurries, corrosive fluids, and other challenging media, ensuring long-lasting operation and reliability.

3. Double Eccentric Butterfly Valves 

Double eccentric butterfly valves, or triple offset butterfly valves, take the design of eccentric valves a step further. With two offsets—one for the disc's rotation and another for the sealing surface—these valves offer enhanced performance, particularly in demanding conditions. The double eccentric design results in lower friction between the disc and seat, allowing for a tight seal without the wear associated with traditional valve designs. They are the ideal choice for high-pressure, high-temperature applications and frequently find use in industries such as oil and gas, power generation, and pharmaceuticals.