High-Quality Four Lever Offset Shutoff Butterfly Valves, Pn2.5-Pn20

• Customization: Available
• Media: Gas
• Driving Mode: Pneumatic
• Model NO.: AOC-430
• Connection Form: Flange
• Structure: Eccentric
• Seal Form: Supercharging Pressured Sealed
• Valve Stem: Link
• Work Pressure: High Pressure (10.0mpa< Pn <80.0mpa)
• Working Temperature: High Temperature (T>450°C)
• Material of Seal Surface: Soft Sealed
• Standard: Sil/API
• Application: Industrial Usage, Water Industrial Usage
• Design Standard: Ap1598API607asmeb16.34
• Standard Size: Nps12-160"(DN300-DN4000)
• Pressure Class: Pn2.5-Pn20/Asmeclass150
• Applicable Temperature: -20 Degree ~ 800 Degree
• Leakage Class: Ansib16.104VI, API598 No Leakage
• Body Material: Astma105A351CF8m/Special Alloy, etc.
• Valve Internals Material: A479-316/S2205/17-4pH
• Operation Mode: Manual, Pneumatic/Electric/Electro-Hydraulic, E
• Design: Anti-Static Design/Anti-Misoperation Design
• Sealing Structures: Multiple Sealing Structures for Option
• Valve Special Treatment: Sand Blasting Surface Treatment SA2.5
• Special Treatment: Painting After Surface Treatment
• Sealing Surface of Valve Plate: Hard Alloy Surfacing
• Valve Body Treatment: Sandblasted Inside and Outside
• Fire Protection Design: API607
• Transport Package: Wooden
• Trademark: SNT
• Origin: China
• HS Code: 8481804090
• Production Capacity: 500000PCS/Year

Product Description

About SNT Butterfly Valves

In recent years, With the improvement of industry and the requirements of energy conservation and environmental protection policy, the cut-off butterfly valve has been more and more widely used. In the prior technology, the tri-eccentric butterfly valve belongs to torque sealing, and the valve plate is closed more tightly by the torque of the actuator to achieve the sealing effect. However, in some special occasions (such as high temperature catalytic flue gas, gas, sulfur tail gas and other media, the temperature reaches 800°C), due to the existence of thermal expansion stress, the valve will not be able to open, easy to cause serious consequences such as tri-eccentric butterfly valve stuck, affecting industrial production, causing huge economic losses, and even cause safety accidents.


SNT VALVE is specialized in the research of high temperature flue gas device butterfly valve. For the above problems, SNT VALVE proposed to use four-stem eccentric butterfly valve instead of tri-eccentric butterfly valve and aeration butterfly valve as a solution in the industry for the first time, successfully solved the problem for many years, applied for two national patents: a four-stem eccentric butterfly valve (patent No.: ZL201520326489.1 and catalytic device with four-stem eccentric butterfly valve (patent No.: ZL201921719624.3), and commissioned China Petroleum and Chemical Industry Federation wot conduct product identification with Changzhou University, which was awarded as the domestic leader.

<sup>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, the pinnacle of precision in high-temperature, large-diameter applications requiring high flow with minimal pressure drop and leakage. Engineered for excellence, its superior planar sealing performance ensures seamless operation even under high-temperature conditions, effectively preventing valve jamming. With lightning-fast opening and closing capabilities, impeccable adjustment accuracy, and rock-solid sealing reliability, this valve is your go-to solution for regulating or shutting off media in the production processes of phthalic anhydride and maleic anhydride. Its versatility extends to controlling a variety of gases and liquids, including hydrogen, ammonia, air, smoke, and gas in pipeline systems. For media susceptible to crystallization, such as sulfur, the valve can be customized with a jacketed structure to avert pipeline blockages caused by cooling and condensation during flow.

The AOC-4000 series four-link eccentric butterfly valve comes standard with a cylinder-type single-acting actuator, offering unmatched operational efficiency. However, flexibility is paramount, allowing you to choose from cylinder-type double-acting actuators, electric actuators, or hydraulic actuators to perfectly meet your specific requirements. Its rapid response is underscored by a swift shut-off time that can range from a mere 2 to 6 seconds, ensuring optimal performance across various applications.</sup>




Working Principle

^{Delve into the advanced mechanics of the four-link butterfly valve, which comprises a sophisticated drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The valve's opening and closing are orchestrated by the drive device, engaging the valve shaft and the four-link mechanism. As the valve shaft rotates, it deftly maneuvers the valve plate into an open position, aligning it parallel to the pipeline center to achieve a fully open state. Conversely, a reverse rotation closes the valve plate, whereupon it presses against the valve body's sealing surface to ensure a fully closed system, guaranteeing utmost precision and reliability.}

Product Specifications

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

 

Design Features

^{• This exceptional valve boasts a maximum connecting valve body diameter reaching an impressive DN4000, offering versatility for various applications.
• Innovative and exclusive four-stem design, coupled with a precision-engineered flat seal design ensures optimal performance and reliability.
• The advanced external double bearing design effectively prevents medium intrusion into the bearing, eliminating blockage risks and enhancing durability.
• Strategically integrated drain valve safeguards against medium-induced corrosion, extending the product's lifespan.
• Engineered for high temperature environments, it is capable of withstanding heat up to a formidable 800 ºC, ensuring reliable performance in extreme conditions.
• Compliant with API607 standards, the fire protection design delivers unmatched safety and peace of mind.
• Robust integral stem design incorporates an anti-center shaft out mechanism, enhancing structural integrity.
• Integrated anti-static design reduces potential hazards, bolstering operational safety.
• Thoughtful anti-misoperation design minimizes user errors, ensuring seamless operations.
• Customizable multiple sealing structures are available to fit diverse operational needs and preferences.
• Expertly constructed with a fabricated design for enhanced performance and resilience.
• The thoughtful design ensures that during the initial and final stages of operation, the disc moves parallel to the body seat, providing a friction-free, smooth motion.
• An array of seat arrangements is offered to accommodate specific application requirements, offering flexibility and adaptability.}
 

Product Range

^{★ Design standard: AP1598, API607, ASME B16.34
★ Standard size: NPS12-160" (DN300-DN4000)
★ Pressure class: PN2.5-PN20 / ASME CLASS 150
★ Applicable temperature: -20°C to 800°C
★ Leakage class: ANSI B16.104 VI, API598 No leakage
★ Body material: ASTM A105, A351 CF8M /special alloy, etc.
★ Valve internals material: A479-316; S2205; 17-4PH
★ Operation mode: manual, pneumatic, electric, electro-hydraulic, etc.
★Product range can be expanded according to user needs}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Comprehensive sandblasting on the entire valve body, both internally and externally, to ensure optimal surface cleanliness and preparation.
2. After sandblasting, the surface achieves a refined finish with exceptionally strong paint adhesion, ensuring long-lasting durability.
3. If the oxygen content in the medium surpasses 23.5%, external sandblasting is performed, eliminating the need for internal treatment.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painted surface withstands temperatures up to 450°C, with further treatments available for even higher temperature resistance.
2. We apply two protective paint layers, each 35 micrometers thick, to ensure superior corrosion resistance and longevity.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The valve plate's sealing surface can be expertly welded with high-performance Hastelloy, Stellited grade 6,
b) and enhanced with tungsten carbide or other hard alloys, achieving impressive hardness levels of HRC60-70 for exceptional durability.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: This is a pivotal use case where our advanced technology shines, offering unparalleled efficiency and reliability in recovery processes.

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Four-Level System: A high-performance solution tailored for the petrochemical industry to ensure optimal operation.stem: Our sophisticated valve systems are designed with precision, ensuring seamless integration and superior performance in demanding environments. Butterfly Valve: Engineered for excellence, this valve represents the pinnacle of durability and efficiency.Theright: Selecting our valve guarantees superior results, reliability, and longevity in all applications. figure: Observe our expertly crafted design, illustrating the perfect blend of form and function. is: The embodiment of innovation and quality in the valve industry. used product after: This product maintains its integrity and performance even after extensive use. 4 years: Proven durability through rigorous long-term applications.

Petro China 270,000 tons/year sulfur tail gas standard project: A testament to our product's robustness and efficiency in large-scale industrial applications.

Catalytic flue gas turbine outlet butterfly valve instead of water seal tank: A superior alternative enhancing both efficiency and performance in modern applications.

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site: Our solutions offer a marked improvement in efficiency and environmental impact.

Images from the scene: Capturing the essence of our technology in action, demonstrating its real-world impact and effectiveness. of: Highlighting the strength and versatility of our products. SINOCHEM GROUP: A trusted partner in delivering cutting-edge solutions for complex industrial challenges. Refining and Chemical: Our products are engineered to meet the rigorous demands of refining and chemical industries. Catalytic flue gas turbine outlet: Precision-engineered for optimal performance in crucial industrial processes. to chimney: Ensuring efficient flow management and emission control from turbine outlet to chimney.

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a distinguished producer in the realm of control valves, seamlessly integrating manufacturing, design, sales, and exceptional service capabilities into one cohesive entity. With a foundation built on high standards and rapid development, SNT is strategically located in Qingdao, Shandong Province, spanning an impressive 42,000 square meters. Our facilities boast state-of-the-art workshops and cutting-edge production equipment. As a recognized high-tech enterprise, we proudly hold independent intellectual property rights and have embraced advanced management and production techniques from abroad. Our workforce exceeds 150 dedicated professionals, with 15% being specialized R&D experts and 30% holding graduate or higher degrees. Driven by a commitment to excellence in production management and pioneering technological advancements, we manufacture extensive quantities of top-tier valves, serving vital industries such as petrochemical, oil, and coal chemical sectors. Our remarkable sales value reached nearly 100 billion in 2017, a testament to our success.

SNT has earned the prestigious TS Special Equipment Manufacturing Certificate and the ISO 9001 certification, reinforcing our commitment to quality and safety standards. We have also secured the net qualification certificate from industry giants like SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our innovative spirit is reflected in numerous National Patents across various technologies. Our expertise extends to designing and manufacturing a comprehensive range of valves according to ANSI, API, DIN, BS, and JIS standards. By synthesizing the standout features of renowned global valves with our independent research and development efforts, we excel in producing a diverse array 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 driving forms encompass manual, power-driven, pneumatic, and hydraulic operations. We utilize top-quality materials such as A216 WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, offering specifications from 1/2" to 120", and handling working pressures of ANSI 150# to 2500#, withstanding temperatures from -196ºC to 1100ºC.

Leveraging advanced production technology and a robust quality assurance system, SNT Valves are trusted across a wide spectrum of industries, including petrochemical, oil, steel and iron, paper manufacturing, and power stations. Our esteemed clients include top industry leaders such as SINOPEC QILU Branch, SINOPEC Qingdao Branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi Branch, PETROCHINA Ningxia Branch, and numerous others, including SINOPEC Changling Branch and Jinan Branch. Our products consistently meet their stringent demands, underscoring our reliability and expertise.

Prioritizing our users' profitability, we are dedicated to establishing a brand synonymous with superior quality and reliability. Our comprehensive quality assurance protocols and after-sales systems ensure that SNT valves forge lasting partnerships with our clientele, collaboratively driving prosperity and mutual success. We are committed to excellence in every endeavor, ensuring customer satisfaction and trust in our brand.</sup>