In the modern industrial field, valves, as crucial components in fluid control systems, play a vital role. Flanged butterfly valves stand out among numerous valve types due to their unique structural design and excellent performance characteristics. They are widely used in industries such as water supply and drainage, sewage treatment, food, heating, gas, shipping, hydropower, metallurgy, energy systems, and light textile. This article will thoroughly explore the structural features, main characteristics, and application fields of flanged butterfly valves. It will also analyze their advantages under different working conditions through practical cases and finally introduce the unique advantages of EATHU flanged butterfly valves, providing professional reference bases for users when choosing valves.
Flanged butterfly valves mainly consist of components such as the valve body, valve seat, disc, and valve stem. Their working principle is to rotate the valve stem to drive the disc, thus realizing the opening and closing of the valve. When the disc rotates to be parallel to the pipeline axis, the valve is in an open state, and the fluid can flow smoothly through it. When the disc rotates to be perpendicular to the pipeline axis, the valve is in a closed state, preventing the fluid from flowing.
The valve seats of flanged butterfly valves are usually made of synthetic rubber. When the disc is closed, the outer circular cover of the disc presses against the valve seat, causing the valve seat to undergo elastic deformation. The elastic force generated by this elastic deformation serves as the sealing specific pressure, ensuring the sealing performance of the butterfly valve. Synthetic rubber valve seats have good elasticity and wear resistance, can adapt to different pressure and temperature conditions, and can effectively prevent fluid leakage.
The valve seat sealing ring of the flanged hard-sealing butterfly valve consists of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring. This structure combines the advantages of metal hard sealing and soft sealing. It can maintain good sealing performance under high temperature and high pressure and also has good elasticity and sealing performance in a low-temperature environment. The hard-sealing structure also has the characteristics of wear resistance and corrosion resistance and is suitable for various harsh working environments.
The sealing surface between the disc and the valve seat has an oblique conical structure. Welding temperature-resistant and corrosion-resistant alloy materials on the oblique conical surface of the disc effectively compensates for the tolerance zone between the sleeve and the valve body and the elastic deformation of the valve stem under the pressure of the medium. This structural design solves the sealing problems existing in the process of bidirectional interchangeable medium transmission of the valve. The oblique conical sealing surface can provide a larger sealing contact area, improve the sealing performance, and at the same time reduce the fluid resistance and lower the operating torque of the valve.
The valve seat sealing ring of the flanged hard-sealing butterfly valve consists of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring. The soft T-shaped sealing ring provides good elasticity and sealing performance, while the multiple layers of stainless steel sheets enhance the strength and wear resistance of the sealing ring. This structural design enables the valve seat sealing ring to withstand higher pressure and temperature and can effectively prevent the sealing ring from being corroded and worn by the medium.
The addition of multiple layers of stainless steel sheets makes the valve seat sealing ring have a higher sealing specific pressure and can maintain good sealing performance under different working conditions. Even in environments with high pressure, high temperature, or corrosive media, it can effectively prevent fluid leakage. In addition, the elasticity of the soft T-shaped sealing ring can adapt to the movement of the disc, ensuring the reliability of the seal.
In the petrochemical industry, flanged hard-sealing butterfly valves are widely used in high-temperature and high-pressure pipeline systems. For example, in refining units, flanged hard-sealing butterfly valves are used to control the flow and pressure of media such as crude oil and refined oil products. Since the media have characteristics such as high temperature, high pressure, and corrosiveness, extremely high requirements are placed on the sealing performance of the valves. The valve seat sealing ring enhanced by multiple layers of stainless steel sheets can meet these harsh working conditions and ensure the safe and reliable operation of the valves.
The sealing surface between the disc and the valve seat has an oblique conical structure, which enables the disc to form good sealing contact with the valve seat when closed. Welding temperature-resistant and corrosion-resistant alloy materials on the oblique conical surface of the disc improves the hardness and corrosion resistance of the sealing surface. Meanwhile, the structure in which the spring fixed between the adjusting ring pressure plates is assembled with the adjusting bolts on the pressure plates can effectively compensate for the tolerance zone between the sleeve and the valve body and the elastic deformation of the valve stem under the pressure of the medium.
This structural design solves the sealing problems existing in the process of bidirectional interchangeable medium transmission of the valve. No matter which direction the medium flows from, the oblique conical sealing structure can provide reliable sealing performance. The combination of the spring and the adjusting bolts can automatically adjust the sealing specific pressure according to the change of the medium pressure, ensuring that the valve can maintain a good sealing state under different working conditions.
During the use of the valve, the tolerance zone between the sleeve and the valve body and the valve stem will generate elastic deformation under the pressure of the medium. The spring and adjusting bolts in the oblique conical sealing structure can effectively compensate for these deformations, avoiding sealing failure caused by deformation. This design improves the reliability and service life of the valve and reduces maintenance costs.
Using a soft T-shaped sealing ring with multiple layers of stainless steel sheets on both sides to form a sealing ring combines the dual advantages of metal hard sealing and soft sealing. Metal hard sealing provides high strength and wear resistance and can maintain good sealing performance under high temperature and high pressure. Soft sealing has good elasticity and sealing performance and can adapt to changes in pipeline deformation and medium pressure.
This sealing ring has zero leakage sealing performance regardless of whether it is in a low-temperature or high-temperature situation. The elasticity of the soft T-shaped sealing ring can ensure the reliability of the seal at low temperatures, while the multiple layers of stainless steel sheets provide stable sealing performance at high temperatures. This dual advantage enables flanged butterfly valves to effectively prevent fluid leakage under various temperature conditions.
Due to its zero leakage sealing performance and wide temperature adaptation range, flanged butterfly valves are applicable to various industries and fields. Whether in low-temperature freezing systems or high-temperature steam pipelines, flanged butterfly valves can exhibit excellent sealing performance and ensure the safe control of fluids.
Flanged butterfly valves are small in size and light in weight, making them more convenient and quicker during installation and maintenance. Compared with other types of valves, flanged butterfly valves do not need to occupy a large amount of space and can adapt to various complex installation environments. In a narrow space, the installation and disassembly of flanged butterfly valves are easier, reducing the difficulty and cost of installation and maintenance.
Due to their small size and light weight, flanged butterfly valves can be installed in any position without being restricted by pipeline layout and space. Whether it is a horizontal pipeline, a vertical pipeline, or an inclined pipeline, flanged butterfly valves can work normally, providing users with greater flexibility and convenience.
The small-sized and lightweight flanged butterfly valves have less impact on the pipeline system. They will not bring excessive additional loads to the pipeline, reducing the stress concentration and deformation risks of the pipeline. Meanwhile, the light weight of flanged butterfly valves also reduces the support requirements of the pipeline, saving the cost of pipeline installation.
The structure of flanged butterfly valves is simple, and the working principle is easy to understand. By rotating the valve stem to drive the disc, the opening and closing of the valve are realized. This simple structural design makes the operation of flanged butterfly valves more convenient, reducing the training cost and operation difficulty for operators.
The compact structure of flanged butterfly valves occupies less space. In some occasions with limited space, such as ships and chemical equipment, the compact design can effectively utilize space, improve the integration and reliability of the equipment. Meanwhile, the compact structure also makes the transportation and installation of flanged butterfly valves more convenient and quick.
The simple and compact flanged butterfly valves have a small operating torque and can rotate quickly by 90°. This means that the operation of the valve is more labor-saving and can quickly respond to control signals to achieve precise control of the fluid. In some occasions with high requirements for response speed, such as automated production lines and emergency shutdown systems, the quick rotation feature of flanged butterfly valves can play an important role.
The flow characteristics of flanged butterfly valves tend to be linear, which means that the pressure loss of the fluid when passing through the valve is small, and the relationship between the flow rate and the valve opening is more linear. This good flow characteristic makes the flanged butterfly valve more accurate and reliable in regulating the flow rate and can meet the requirements for flow control under different working conditions.
Flanged butterfly valves have good regulation performance and can precisely adjust the flow rate and pressure of the fluid as needed. By adjusting the opening of the disc, stepless regulation of the fluid can be achieved to meet the needs of different process processes. In some occasions where precise flow control is required, such as chemical production and the pharmaceutical industry, the regulation performance of flanged butterfly valves can play an important role.
Due to their good flow characteristics and regulation performance, flanged butterfly valves have less impact on the stability of the fluid system. They will not cause turbulence and pressure fluctuations of the fluid, ensuring the stable operation of the fluid system. In some occasions with high requirements for the stability of the fluid system, such as high-precision metering systems and laboratory equipment, flanged butterfly valves are an ideal choice.
The connection between the disc and the valve stem adopts a pinless structure, which has higher reliability and stability. The pinless connection avoids problems such as loosening and falling off of pins, reducing the failure rate of the valve. Meanwhile, the pinless connection also makes the transmission between the disc and the valve stem smoother, improving the operation accuracy and service life of the valve.
The design of the pinless connection makes the disassembly and installation of the disc and the valve stem more convenient and quick. When maintaining and replacing valve components, there is no need to disassemble pins, greatly reducing maintenance costs and time. This design also improves the maintainability of the valve and extends its service life.
The pinless connection between the disc and the valve stem can better transmit torque, improving the operation efficiency of the valve. Meanwhile, the pinless connection also reduces the internal leakage points of the valve, improving its sealing performance. In some occasions with high requirements for valve performance, such as high-pressure, high-temperature, and corrosive medium environments, the advantages of the pinless connection are more obvious.
The outer circle of the disc adopts a spherical shape, which can improve the sealing performance. The spherical shape makes the sealing contact between the disc and the valve seat closer, increases the sealing area, and improves the sealing specific pressure. Under the action of pressure, the spherical-shaped disc can better adapt to the deformation of the valve seat and maintain a zero-leakage sealing state.
The spherical shape of the outer circle of the disc can also reduce the impact and wear of the fluid on the disc, extending the service life of the valve. In some pipeline systems with high-speed fluids or media containing particles, the spherical-shaped disc can effectively reduce wear and damage, improving the reliability and stability of the valve.
In addition to improving the sealing performance and extending the service life, the spherical shape of the outer circle of the disc also enhances the aesthetics of the valve. In some occasions with high requirements for appearance, such as the food and pharmaceutical industries, the spherical-shaped disc can add a touch of refinement and beauty to the equipment.
The seal of the flanged butterfly valve can be replaced, which means that when the seal is damaged or aged, it can be conveniently replaced, extending the service life of the valve. Meanwhile, the replaceable seal design also improves the maintenance efficiency of the valve and reduces the maintenance cost.
The seal of the flanged butterfly valve is reliable for bidirectional sealing. No matter which direction the medium flows from, it can maintain good sealing performance. This bidirectional sealing characteristic makes the flanged butterfly valve have important application value in some occasions where bidirectional control of fluids is required, such as sewage treatment and water supply and drainage systems.
The reliable bidirectional sealing performance enables the flanged butterfly valve to adapt to different media, including liquids, gases, and steam. Whether in pipeline systems with clean media or those containing particles and corrosive media, the flanged butterfly valve can exhibit excellent sealing performance and ensure the safe control of fluids.
The disc can be sprayed according to user requirements, such as with materials like nylon or polytetrafluoroethylene. These spraying materials have good wear resistance, corrosion resistance, and self-lubricating properties, which can improve the service life and sealing performance of the disc. Different spraying materials are suitable for different working environments and media, and users can make selections according to actual needs.
Disc spraying can improve the performance of the valve and enhance its adaptability in specific working environments. For example, in some pipeline systems with corrosive media, a disc sprayed with polytetrafluoroethylene can effectively prevent corrosion, improving the reliability and stability of the valve. In some occasions where a low friction coefficient is required, a disc sprayed with nylon can reduce the operating torque and improve the operation efficiency of the valve.
The disc spraying option provides users with the opportunity for personalized customization, meeting special requirements of different users for valve performance and appearance. Users can choose different spraying materials and colors according to their own needs, making the valve coordinate with the overall style of the equipment and improving the aesthetics and practicality of the equipment.
Flange connection is one of the common connection methods for flanged butterfly valves. Flange connection has the characteristics of firm connection, good sealing performance, and convenience for installation and disassembly. In some large pipeline systems, flange connection can withstand higher pressure and temperature, ensuring the safe and reliable operation of the valve.
Clamping connection is a quick connection method, suitable for some occasions that require frequent installation and disassembly. Clamping connection does not need bolts and nuts. It connects the valve and the pipeline together through a clamping device, with simple and quick operation. Meanwhile, clamping connection also has good sealing performance and anti-seismic performance and can adapt to some special working environments.
The selectable flange connection and clamping connection methods meet the needs of different users for valve connection methods. Users can choose the appropriate connection method according to the actual situation to improve the installation and use efficiency of the valve. In some special application occasions, other connection methods can also be customized according to user requirements to meet the personalized needs of users
Manual driving is one of the most basic driving methods for flanged butterfly valves. Manual driving is suitable for some small pipeline systems or occasions with low operation frequencies. The manually driven flanged butterfly valve has a simple structure, low cost, and convenient and reliable operation. In some occasions where automatic control is not required, the manually driven flanged butterfly valve is an economical and practical choice.
Electrically driven flanged butterfly valves have the advantages of convenient operation, high automation degree, and high control precision. Electric driving can realize remote control and automatic control, improving the operation efficiency and precision of the valve. In some large pipeline systems or occasions that require frequent operations, electrically driven flanged butterfly valves can meet the needs of users for automated control.
Pneumatically driven flanged butterfly valves have the characteristics of quick action, high reliability, and good explosion-proof performance. Pneumatic driving is suitable for some occasions with high requirements for response speed and where there are flammable and explosive risks. In some industries such as chemical and petroleum, pneumatically driven flanged butterfly valves are widely used.
The diversified driving methods meet the requirements for flanged butterfly valves under different working conditions. Users can choose the appropriate driving method according to the actual working conditions to improve the applicability and reliability of the valve. In some special application occasions, other driving methods such as hydraulic driving can also be adopted to meet the personalized needs of users.
EATHU adopts advanced manufacturing technology and high-precision machining equipment to ensure that each component of flanged butterfly valves is of excellent quality. From the casting of the valve body to the machining of the valve plate and stem, every step of the process strictly follows international standards and industry norms to ensure the dimensional accuracy and shape tolerance of the valve. For example, in the casting process of the valve body, advanced mold technology and precision casting technology are used to make the internal structure of the valve body more dense and uniform, without air holes, sand holes and other defects, thus improving the strength and pressure resistance of the valve body. The processing of the valve plate and valve stem adopts CNC machining center, which can precisely control the processing size and surface roughness to ensure that the sealing matching precision between the butterfly plate and the valve seat reaches a very high level, which effectively improves the sealing performance and service life of the valve.
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