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In recent years, with the advancement of industrial technology and the increasing demand for energy conservation and environmental protection, the necessity for efficient solutions has become apparent. Thus, policy has driven theusage of cut-off butterfly valves to expand significantly. In traditionaltechnology, thetri-eccentric butterfly valve operates on torque sealing principles, where the valve plate is firmly secured by the actuator's torque, ensuring a reliable seal. However, in specialized environments (such as high temperature catalytic flue gas, gas, sulfur tail gas, and other media where temperatures soar to 800°C), thermal expansion stress can hinder valve operation, leading to critical issues such as tri-eccentric butterfly valve obstruction, whichimpacts industrial productivity,resulting in substantial economic losses, and poses potential safety hazards.
SNT VALVE has dedicated itself to the research and development of high-temperature flue gas device-specific butterfly valves.To address these challenges, SNT VALVE introduced the innovative four- stemeccentric butterfly valve to replace the tri- eccentric butterfly valve, along with theerationbutterfly valve solution, breaking new ground in the industry. This solution has successfully resolved age-old issues, leading to two national patents: a four-stem eccentric butterfly valve (patent No.ZL201520326489.1) and a catalytic device equipped with a four- stem eccentric butterfly valve (patentNo. ZL201921719624.3). SNT VALVE partnered with the China Petroleum and Chemical Industry Federationto conduct product identification in collaboration with Changzhou University,earning recognition as a domestic leader. Four-link Eccentric Butterfly Valve Application The AOC-4000 series four-link eccentric butterfly valve, meticulously crafted by SNT, stands out as a choice solution, adeptly managing special conditions for both regulation and shut-off applications. It exemplifies the pinnacle of engineering innovation, ensuring reliability and efficiency in demanding operational environments,solidifying SNT's role as a trailblazer in the valve industry. Its application in critical industrial settings underscores itsunmatched performance and trustworthiness.
Four-link Eccentric Butterfly Valve Application
The AOC-4000 series four-link eccentric butterfly valve, designed by SNT, is widely used as a special condition regulating and shut-off valve.
Introducing the AOC-4000 series four-link eccentric butterfly valve, an engineering marvel crafted for scenarios demanding high-temperature tolerance, large-diameter flow, and minimal pressure drop. This valve shines with its state-of-the-art planar sealing technology, expertly designed to prevent jamming under intense heat. Boasting rapid opening and closing capabilities, it offers precision in adjustments and steadfast sealing. Ideal for the meticulous regulation or complete shut-off of pipeline media, it is indispensable in the production of phthalic anhydride and maleic anhydride. Versatile in nature, it adeptly controls a variety of gases and liquids, such as hydrogen, ammonia, air, smoke, and gas within pipeline systems. Moreover, for media that crystallize easily, like sulfur, an innovative jacketed structure ensures uninterrupted flow by preventing blockages caused by cooling and condensation.
The AOC-4000 series four-link eccentric butterfly valve is typically paired with a high-efficiency cylinder-type single-acting actuator. However, adaptability is at your fingertips, with options for cylinder-type double-acting actuators, electric actuators, and hydraulic actuators, tailored to your specific needs. Experience the swiftest shut-off times ranging from a lightning-fast 2 to a mere 6 seconds, ensuring your operations remain uninterrupted and seamless.
Working Principle
The sophisticated design of the four-link butterfly valve encompasses a finely-tuned drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The operation of the valve is initiated by the drive device, which propels the valve shaft and the intricate four-link mechanism. As the valve shaft rotates, the valve plate elegantly opens, achieving full openness when aligned with the pipeline's center. Conversely, the reverse rotation initiates closure, and, as the valve plate compresses the sealing surface of the valve body, a complete seal is achieved. This meticulous process ensures precision control and reliability every time.
Body
| Type | Four Lever Offset Buterfly Valves |
| Body Size | NPS 6-64''(DN 150-DN 1600) |
| Disc Form | Four Lever Eccentric |
| Flow to | Flow into the shaft side |
| Characteristics | Liner/On-off |
| Trim material/Trim treatment | See valve material table |
| Body ratings | ASME B16.34 ANSI 150 |
| Body Connections | ·ANSI, EN Double Flanged ·ANSI B16.25 ·API 609 Single Flange-Lug Type |
| Face to Face Dimension | See valve overall size |
| Range ability | Over 100:1(See Cv coefficients table) |
| Bonnet Type | Standard -29 degree Radiation fin -55 degree-566 degree Cryogenic -196 degree-55 degree |
| Packing | PTFE flexible graphite |
Leakage Class | According to API 598 Zero Leakage |
• Experience unmatched connectivity with a maximum valve body diameter reaching up to DN4000, tailored for expansive applications.
• Innovatively crafted with a unique four-stem structure design, complemented by a sophisticated flat seal design, ensuring secure and robust operations.
• A pioneering external double bearing design effectively shields against medium infiltration, preventing blockage and enhancing durability.
• The strategically integrated drain valve offers resilience against medium corrosion, prolonging the lifespan of the valve.
• Built to withstand extreme conditions with a high temperature design sustaining up to 800 ºC, ensuring reliability under severe thermal stress.
• Engineered with an API607 Fire Protection Design, providing unparalleled safety and peace of mind.
• The integral stem design features an anti-center shaft out mechanism, reinforcing structural integrity.
• Advanced anti-static design guarantees uninterrupted and safe operations.
• Incorporated anti-misoperation design for enhanced operational security and efficiency.
• Choose from multiple sealing structures, perfectly customizable to meet diverse operational needs.
• Crafted with meticulous precision through fabricated construction, ensuring exceptional quality and performance.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat providing a friction-free motion, optimizing functionality and reducing wear.
• Explore various seat arrangements designed to cater to specific usage requirements and enhance versatility.
★ Design Standard: AP1598, API607, ASME B16.34 - Precision crafted for excellence
★ Standard Size Options: NPS 12-160 (DN300-DN4000) - Versatile dimensions to suit varied applications
★ Pressure Range Class: PN2.5-PN20 / ASME CLASS 150 - Optimized for diverse pressure conditions
★ Applicable Temperature Range: -20 °C to 800 °C - Robust performance in extreme temperatures
★ Leakage Class: ANSI B16.104 VI, API598 - No leakage, ensuring system integrity No Leakage
★ Body Material: ASTM A105, A351 CF8M /Special alloys, etc. - Engineered for durability and reliability
★ Valve Internals Material: A479-316, S2205, 17-4PH - High-performance components for superior operation
★ Operation Mode: Manual, Pneumatic, Electric, Electro-hydraulic, etc. - Versatile control options for dynamic needs
★Product range can be tailored to meet specific user requirements.
• Sand Blasting Surface Treatment SA2.5
1. Comprehensive sandblasting of the valve body, both inside and out, ensures smooth and clean surfaces.
2. After sandblasting, experience an impeccably fine surface that boasts superior paint adhesion.
3. If the oxygen content in the mediumum exceeds 23.5%, only external sandblasting is necessary; internal sandblasting becomes optional.•
1. The standard meticulously painted surface can endure temperatures up to an impressive 450°C, with options for higher temperature solutions available on request.
2. Dual coats of high-quality paint, each 35 micrometers thick, provide robust protection against corrosion.
• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The valve plate's sealing surface can be expertly welded with premium materials such as Hastelloy or Stellited gr.6,
b) Advanced options include tungsten carbide and various hard alloy spraying, achieving remarkable hardness levels of HRC60-70, ensuring durability and strength.
SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Four-stem: A key component in the integration of advanced flue gas management systems, ensuring optimal performance and reliability. Butterfly Valve (The right figure: This illustration demonstrates the is used product after 4 years): It highlights the durability and sustained performance of our engineered solutions over time.
Petro China 270,000 tons/year sulfur tail gas standard project: A showcase of cutting-edge technology in reducing emissions and improving operational efficiency.
catalytic flue gas turbine outlet butterfly valve instead of water seal tank: This innovative substitution enhances system performance and minimizes environmental impact.
Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site: A detailed assessment of efficiency gains and technological advancements achieved through our high-performance butterfly valves.
Images from the scene of SINOCHEM GROUP: Illustrating the implementation and real-world benefits of advanced engineering solutions in complex industrial environments. Refining and Chemical: Leading-edge solutions for refining and chemical industries designed to maximize productivity and sustainability. catalytic flue gas turbine outlet: Engineered to deliver superior performance and reliability in challenging operational conditions. to chimney: Facilitating efficient and environmentally responsible emissions management.
SNT Machinery (Qingdao) Co., Ltd is a dynamic and innovative manufacturer of control valves, seamlessly integrating manufacturing, design, sales, and service into one cohesive operation. With a strong foundation and rapid growth trajectory, SNT is situated in the vibrant city of Qingdao, Shandong province, spanning a remarkable 42,000m2. Our facilities boast state-of-the-art workshops and production equipment, positioning us as a high-tech enterprise with proprietary intellectual property and the integration of advanced international management and production methodologies. With a dedicated workforce of over 150 employees, 15% of whom are R&D specialists, and 30% holding graduate or higher degrees, we leverage our exceptional production management team and cutting-edge technology to deliver superior quality valves. Our valves are extensively utilized across petrochemical, oil, and coal chemical industries, achieving an impressive sales value nearing 100 billion in 2017.
SNT has proudly secured the TS special equipment manufacturing certificate and ISO 9001 certification. We are recognized with the net qualification certificate from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM, and have obtained numerous national patents for our technological advancements. Our capabilities extend to designing and manufacturing a comprehensive range of valves in adherence to ANSI, API, DIN, BS, and JIS standards. By integrating the outstanding qualities of renowned valves worldwide with our independent research and development, we produce an extensive variety of valves, including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, Eccentric Rotary Valves, T Three-eccentric Center Butterfly Valves, V Ball Valves, High Wear-resistant Ball Valves, High Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, Cryogenic Valves, and more. Our valves offer multiple driving options such as manual operation, power-driven, pneumatic, and hydraulic drives. We utilize high-grade materials like A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, with specifications ranging from 1/2" to 120", working pressures of ANSI 150# to 2500#, and temperatures from -196ºC to 1100ºC.
With a robust foundation in cutting-edge production technology management and a comprehensive quality assurance system, SNT Valves are extensively utilized in petrochemical, oil, steel & iron, paper manufacturing, and power station sectors. Our esteemed client base includes prominent industry players such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, and many more, demonstrating our commitment to excellence and reliability.
At SNT, we prioritize our users' profitability and are dedicated to building a brand synonymous with exceptional quality and reliability. Our impeccable quality assurance and comprehensive after-sales support systems ensure that SNT valves foster enduring partnerships with our valued customers, driving mutual success and prosperity.
