Four Lever Offset Shutoff Butterfly Valves, Ideal for Industrial Applications

• 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, as the industry has evolved and surged forward with groundbreaking advancements, the emphasis on energy efficiency and green initiatives has become paramount, with policies worldwide leading this movement.As a result, the application of cut-off butterfly valves has significantly broadened. Historically, technology has relied heavily ontri-eccentric butterfly valves, which utilize torque sealing. Here, the valve plate is sealed tightly by actuator torque, ensuring a robust seal. However, in specialized circumstances (such as handling high-temperature catalytic flue gases, gases, sulfur tail gases, and other media where temperatures soar to 800°C), thermal expansion stress may cause the valve to jam, leading to potentially severe issues like tri-eccentric butterfly valve obstructions, severelyimpact ing industrial output, resulting in substantial economic losses, and even posing significant safety hazards.


SNT VALVE is at the forefront, dedicated to advancing research in butterfly valves for high-temperature flue gas applications.. To address these critical challenges, SNT VALVE has pioneered the use of the revolutionary four- stemeccentric butterfly valve as an alternative to the conventional t ri-eccentric butterfly valve, coupled withinnovative erationbutterfly valve solutions, marking a breakthrough in the industry. This landmark innovation, introduced for the first time, has effectively rectified longstanding issues, earning two national patents: a four- stemeccentric butterfly valve (patent No. :ZL201520326489.1, and a catalytic device incorporating a four- stemeccentric butterfly valve (patent No. : ZL201921719624.3). These innovations have been validated by the China Petroleum and Chemical Industry Federation, who commissioned product identification tests in cooperation with Changzhou University. This collaborationhas been recognized and honoredas leading domestically.

<sup>Four-link Eccentric Butterfly Valve Application: Introducing SNT's AOC-4000 series, an innovative four-link eccentric butterfly valve, meticulously engineered for regulation and shut-off in special conditions!

The AOC-4000 series, crafted by SNT, excels as a specialized regulating and shut-off valve, setting new standards in demanding applications.
Discover the exemplary AOC-4000 Series Four-Link Eccentric Butterfly Valve, your ultimate solution for high-demand industrial applications. Specifically engineered for high-temperature environments, extensive diameters, and robust flow requirements, this valve guarantees minimal pressure drops and exceptional sealing capabilities. Experience swift opening and closing actions paired with unparalleled adjustment precision. Its superior planar sealing ensures that valve jamming is a thing of the past, even under extreme temperatures. Perfectly suited for the precise regulation or complete shut-off of pipeline media, this valve significantly enhances production processes for chemicals like phthalic anhydride and maleic anhydride. Furthermore, it adeptly manages an array of gases and liquids including hydrogen, ammonia, air, smoke, and more within pipeline systems. For media susceptible to crystallization such as sulfur, an innovative jacketed structure is available, effectively preventing pipeline blockages due to cooling or condensation, thus ensuring smooth flow without interruptions.

The versatile AOC-4000 Series Four-Link Eccentric Butterfly Valve can be seamlessly equipped with a variety of actuator options to suit your specific needs. While the standard configuration features a cylinder-type single-acting actuator, you can opt for the cylinder-type double-acting, electric, or hydraulic actuators based on operational demands. Experience unmatched efficiency with a minimum shut-off time ranging from a mere 2 to 6 seconds, facilitating rapid response times and enhanced control in your industrial applications.</sup>




Working Principle

^{This remarkable four-link butterfly valve is comprised of essential components including a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The operation of the valve is seamless and efficient; the drive device initiates the movement, propelling the valve shaft and the sophisticated four-link mechanism. As the valve shaft rotates, the valve plate opens, aligning parallel with the pipeline center for a fully open position. Conversely, rotating the valve shaft in the opposite direction closes the valve plate. When the plate makes contact and compresses the valve body's sealing surface, the valve achieves a fully closed state, ensuring a tight and reliable seal that is critical for optimal performance in demanding industrial settings.}

Product Specifications

Body: Meticulously crafted with resilience and durability to meet the demanding needs of modern industry, the body of our Four Lever Offset Shutoff Butterfly Valves is designed for exceptional performance and longevity in industrial applications.

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

^{• Boasting an impressive maximum connecting valve body diameter up to DN4000, ensuring high-capacity performance.
• Innovative four-lever stem structure design, complemented by a flat seal configuration for optimal sealing integrity.
• Equipped with an external double bearing design to effectively prevent medium intrusion, safeguarding against blockages and enhancing operational reliability.
• A sophisticated drain valve ensures protection against medium-induced corrosion, prolonging the lifespan of the valve.
• Engineered to withstand high temperatures up to a remarkable 800 ºC, ideal for demanding thermal conditions.
• Incorporating API607 Fire Protection Design, providing robust safety features.
• Features an integral stem design with an anti-center shaft out configuration, enhancing structural integrity and safety.
• Strategically designed with anti-static properties to prevent static-induced complications.
• Comprehensive anti-misoperation design to ensure precise and safe valve operation.
• Offers multiple sealing structures as options, catering to a variety of operational needs and ensuring versatility.
• Expertly crafted with a fabricated construction that enhances durability and resistance to wear.
• During the initial opening and final closing phases, the disc moves parallel to the body seat, delivering friction-free motion and enhancing longevity.
• Flexibility in design with various seat arrangements to meet specific application requirements.}
 

Product Range

^{★ Design Standard: AP1598, API607, ASME B16.34
★ Standard Size: NPS12-160 (DN300-DN4000)
★ Pressure Range: Class: PN2.5-PN20 / ASME CLASS 150
★ Applicable Temperature: -20°C to 800°C
★ Leakage Class: Class: ANSI B16.104 VI, API 598 No Leakage
★ Body Material: ASTM A105, A351 CF8M,special alloys, and more.
★ Valve Internals Material: A479-316, S2205, 17-4PH
★ Operation Modes: Manual, Pneumatic,Electric, Electro-Hydraulic, and Others.
★Product range can be expanded according to user needs.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Expertly sandblasted both internally and externally to ensure a pristine finish on the valve body.
2. Post-sandblasting, the surface is impeccably smooth, enhancing paint adherence and providing robust longevity.
3. For mediums with an O2 content exceeding 23.5%, only external sandblasting is required, as internal sandblasting is unnecessary.•</sup>

<sup>• Painting After Surface Treatment
1. Our standard paint finish endures temperatures up to 450°C, with options for specialized treatments for higher resistance.
2. Dual layers of paint, each 35 micrometers thick, offer superior corrosion protection and extended valve lifespan.

• Hard Alloy Surfacing for the Sealing Surface of the Valve Plate.
a) The valve plate's sealing surface can be reinforced with welding using premium materials like Hastelloy and Stellite Gr.6 for unmatched durability.
b) Advanced spraying techniques apply tungsten carbide and other hard alloys to achieve a hardness rating of HRC60-70, ensuring exceptional performance under extreme conditions.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery - Optimizing Efficiency and Reliability in Gas Recovery Processes

SINOCHEM GROUP - Petrochemical Incineration Boiler Crossover Four-stem - Ensuring Seamless Operations with Our Advanced Butterfly Valve System Butterfly Valve ( - Engineered for Precision and Durability in Challenging EnvironmentsT - The Trusted Choice for Industrial Solutionshe right - Align Your Operations with the Right Valve Solutions figure - Visualize the Impact of Our High-Performance Valves is - Experience Unmatched Quality and Reliability used product after - Witness the Longevity and Consistency of Our Valves 4 years) - Proven Durability Over Four Years of Continuous Use

Petro China 270,000 tons/year sulfur tail gas standard project - A Benchmark in Industry Standards

catalytic flue gas turbine outlet butterfly valve instead of water seal tank - Upgrade to Innovative Valve Solutions

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site - Elevate Your Performance with Our Advanced Technology

Images from the scene - Capturing the Essence of Operational Excellence of - Showcase of Exceptional Valve Applications SINOCHEM GROUP - Leading the Way in Petrochemical Innovations Refining and Chemical - Pioneering Solutions for Refinement Processes catalytic flue gas turbine outlet - Achieve Optimal Output with Our Cutting-Edge Valves to chimney - Directing Efficiency from Source to Output

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. stands as a distinguished producer of control valves, seamlessly integrating manufacturing, design, sales, and service into a cohesive operation. With a high-caliber launch and rapid development trajectory, SNT is strategically located in Qingdao, Shandong Province, sprawling over an expansive 42,000m2 area, fully equipped with cutting-edge workshops and state-of-the-art production equipment. Proudly recognized as a high-tech enterprise, we boast independent intellectual property rights and leverage advanced management and production methodologies imported from leading global practices. Our dedicated team of over 150 professionals includes 15% R&D specialists, with 30% holding graduate or higher degrees. With a robust production management team committed to the highest quality and innovative technology, SNT excels in producing high-volume, superior-quality valves for the petrochemical, oil, and coal chemical industries. In 2017, our sales value soared to nearly 100 billion.

SNT has proudly earned the TS Special Equipment Manufacturing Certificate and ISO 9001 accreditation, alongside the net qualification certificates from SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our technological prowess is underscored by numerous national patents. We skillfully design and manufacture an extensive range of valves, strictly adhering to ANSI, API, DIN, BS, and JIS standards. Harnessing the strengths of renowned global valve designs and channeling independent R&D, we offer a diverse array of valves, including GLOBE, High-Pressure Boiler Blow-down Valves, High-Performance Butterfly Valves, Angle-Regulating Valves, Eccentric Rotary Valves, 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, and Cryogenic Valves. Our driving forms encompass manual, power-driven, pneumatic, and hydraulic options. We employ premium materials such as A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, among others, with specifications ranging from 1/2" to 120", working pressures of ANSI 150# to 2500#, and operating temperatures spanning -196ºC to 1100ºC.

SNT Valves, crafted with cutting-edge production technology and a robust quality assurance system, have become essential in industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele includes SINOPEC QILU Branch, SINOPEC Qingdao Branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi Branch, PETROCHINA Ningxia Branch, SINOPEC Changling Branch, Jinan Branch, and many more. Our valves deliver exceptional performance and reliability across the globe.

At SNT, we prioritize our users' profitability, dedicating ourselves to crafting superior quality and a reputable brand. Our impeccable quality assurance and comprehensive after-sales systems ensure a thriving partnership with all our customers, paving the way for shared success and prosperity.</sup>