Four Lever Offset Shutoff Butterfly Valves for DN300 to DN4000 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, 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.
The AOC-4000 series four-link eccentric butterfly valve is an engineering marvel designed for demanding scenarios such as high-temperature environments, large-diameter pipelines, and settings requiring high flow rates with minimal pressure drops. This valve excels in maintaining low to zero leakage, thanks to its superior planar sealing capabilities that prevent valve jamming even under intense heat. Rapid opening and closing, coupled with high precision in adjustment and dependable sealing, make this valve an ideal choice for regulating or shutting off media within pipelines, particularly in the production of phthalic anhydride and maleic anhydride. Additionally, it is versatile enough for managing other gases and liquids, including hydrogen, ammonia, air, smoke, and various gases within pipeline networks. For media with a tendency to crystallize, such as sulfur, an innovative jacketed structure is available to thwart pipeline blockages due to cooling and condensation during flow.

The AOC-4000 series four-link eccentric butterfly valve is customarily paired with a cylinder-type single-acting actuator, renowned for its efficiency. Nonetheless, if specific operational requirements dictate, alternatives like cylinder-type double-acting actuators, electric actuators, and hydraulic actuators are also available, providing flexibility in application. The valve boasts an impressive minimum shut-off time, ranging from as swift as 2 seconds to a maximum of 6 seconds, ensuring rapid response and control in critical systems.</sup>




Working Principle

^{The four-link butterfly valve is ingeniously constructed, comprising a drive device, valve plate, valve body, valve shaft, a sophisticated linkage system, and shaft end seals. The drive device is the heart of the operation, propelling the valve shaft and the four-link mechanism into action. As the valve shaft rotates, it seamlessly opens the valve plate, achieving a fully open state when the plate aligns parallel to the pipeline's center. Conversely, the reverse rotation of the shaft results in the closure of the valve plate, attaining a fully closed position once the plate contacts and compresses against the sealing surface of the valve body. This intricate mechanism ensures precise control and efficient sealing throughout its operation.}

Product Specifications

Body - Engineered with precision, the body of our Four Lever Offset Shutoff Butterfly Valves is a testament to durability and strength. Crafted to handle the toughest of conditions, this component ensures seamless operation even in the most demanding 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

^{• Experience the versatility of our valve body with a maximum diameter reaching up to DN4000, catering to extensive industrial applications.
• Pioneering in innovation with a unique four-stem structure design, complemented by a cutting-edge flat seal design for enhanced performance.
• Our external double bearing design ingeniously prevents any medium from infiltrating the bearings, effectively eliminating the risk of blockage.
• The intelligently engineered drain valve seamlessly guards against medium corrosion, ensuring longevity and reliability.
• Expertly crafted for high-temperature resilience, our design withstands conditions up to a remarkable 800 ºC
• Incorporating the API607 Fire Protection Design, we prioritize safety and compliance.
• Featuring an integral stem design with anti-center shaft out features, ensuring stability and robustness.
• Our anti-static design minimizes static build-up, enhancing safety and reliability.
• Ingenious anti-misoperation design safeguards against operational errors, ensuring smooth functionality.
• Select from multiple sealing structures tailored to meet diverse operational needs.
• Robust and reliable, our fabricated construction meets the highest industry standards.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat providing a friction-free motion.
• Explore various seat arrangements offering flexibility and adaptability for different applications.}
 

Product Range

^{★ Design standard: AP1598, API607, ASME B16.34
★ Standard size: NPS 12-160 (DN300-DN4000)
★ Pressure class: PN2.5-PN20/ASME CLASS 150
★ Applicable temperature: -20°C to 800°C
★ Leakage class: ANSI B16.104 VI, API 598 no leakage
★ Body material: ASTM A105, A351 CF8M, andspecial alloys available.
★ 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>• Enhanced Sand Blasting Surface Treatment SA2.5
1. Meticulously sandblasted both inside and outside of the valve body to ensure a pristine finish
2. Achieves a fine, smooth surface post-sandblasting, ensuring exceptionally strong paint adhesion for durability
3. If the 02 content in the medium exceeds 23.5%, external sandblasting is performed while internal sandblasting is not necessary•</sup>

<sup>• Advanced Painting after Surface Treatment
1. The standard painted surface has a remarkable temperature resistance of up to 450°C, with options for higher temperature treatments available separately
2. Applied with two robust coats of paint, each 35 micrometers thick, to provide superior corrosion protection

• Premium Hard Alloy Surfacing onthe Sealing Surface ofthe Valve Plate
a) The sealing surface of the valve plate can be expertly welded with Hastelloy, Stellited gr.6, providing optimal performance
b) Tungsten carbide and other high-strength hard alloys are applied through advanced spraying techniques, achieving hardness levels up to HRC60-70</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: Harness the power of advanced technology to efficiently recover and manage sulfur tail gas.

SINOCHEM GROUP Petrochemical Incineration: Discover how our cutting-edge butterfly valves are integrated into large-scale operations.stem: Utilizing the robust design of our systems to ensure seamless functionality and reliability. Butterfly Valve: Experience superior control and precision with our expertly engineered butterfly valves.T: Trust in our technology to deliver performance and dependability.he right: Embrace the advantages of selecting the right equipment tailored to meet specific industrial needs. figure: Analyze detailed representations that provide insights into operational excellence. is: Our implementation is distinguished by its exceptional quality and durability. used product after: Witness the enduring performance and resilience of our products even after extensive usage. 4 years): A testament to the longevity and sustained efficacy of our solutions over time.

Petro China 270,000 tons/year sulfur tail gas standard project: Our solutions are integral to high-capacity projects, demonstrating their scalability and efficiency.

catalytic flue gas turbine outlet butterfly valve instead of water seal tank: Opt for superior alternatives that enhance operational efficiency and reliability.

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site: Examine how our products outperform traditional methods in high-stakes environments.

Images from the scene: Visual documentation highlighting the successful integration and performance of our products in action. of: Demonstrating the versatility and adaptability of our product offerings. SINOCHEM GROUP: A prestigious partner, utilizing our state-of-the-art solutions for optimal results. Refining and Chemical: Partner with industry leaders who trust our cutting-edge solutions for refining and chemical processes. catalytic flue gas turbine outlet: Ensuring efficiency and effectiveness in critical industrial operations. to chimney: Delivering seamless connectivity and performance from source to output.

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a prestigious manufacturer of control valves, seamlessly integrating design, production, sales, and service. With a strategic high-level inception, SNT has experienced rapid growth. Nestled in Qingdao, Shandong province, our expansive 42,000m² facility is outfitted with state-of-the-art workshops and cutting-edge production equipment. As a high-tech enterprise, we boast independent intellectual property rights and leverage advanced management and production expertise from abroad. Our team comprises over 150 dedicated professionals, with 15% specializing in research and development, and 30% holding graduate or higher degrees. Fueled by a superior production management team and pioneering technology, we produce vast quantities of premium quality valves, pivotal for petrochemical, oil, and coal chemical industries. Our remarkable sales reached nearly 100 billion in 2017.

SNT proudly holds the TS Special Equipment Manufacturing Certificate and ISO 9001 certification, along with net qualification certificates from SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our portfolio of national patents underscores our technological prowess. We design and fabricate a comprehensive range of valves conforming to ANSI, API, DIN, BS, and JIS standards. Drawing from the strengths of globally renowned valves and our unique R&D efforts, we produce an extensive variety including GLOBE, High-Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, Eccentric Rotary Valves, Triple-eccentric 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 options encompass manual, electric, pneumatic, and hydraulic methods. Key components are crafted from premium materials like A216 WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M. Specifications range from 1/2" to 120", with working pressures from ANSI 150# to 2500#, and temperatures from -196ºC to 1100ºC.

Embracing cutting-edge production techniques, robust management, and a stringent quality assurance system, SNT valves are extensively deployed across petrochemical, oil, steel & iron, paper manufacturing, and power station sectors. Our esteemed clientele features SINOPEC's Qilu and Qingdao branches, CNOOC Huizhou Refinery, PETROCHINA's Guangxi and Ningxia branches, SINOPEC Changling and Jinan branches, among others.

We prioritize our users' success, dedicating ourselves to exceptional quality and brand excellence. Our impeccable quality assurance and after-sales systems ensure that SNT valves forge prosperous partnerships with all our clients.</sup>