Four Lever Offset Shutoff Butterfly Valves, Designed for Long-Term Reliability with

• 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 industrial landscape continuously evolves and advances, the demand for energy conservation and environmental protection has become increasingly prominent. These heightened standards for energy efficiency and ecological sustainability policiesare driving the broader adoption of cut-off butterfly valves across various applications. Historically, technologicaldevelopments in thisarea haverevealed that the tri-eccentric butterfly valve, which relies on torque sealing, ensures closure by tightening the valve plate with actuator torque to maintain effective sealing. Nevertheless, in specific scenarios, particularly in challenging conditions such as high-temperature catalytic flue gas, gaseous environments, and sulfur-laden tail gas, where temperatures can soar to an astonishing 800°C, thermal expansion stress can render the valve inoperative, leading to potentially severe impacts like tri-eccentricvalve jamming, therebyhindering industrial operations, resulting in substantial financial losses, and could even precipitate safety-related incidents.

SNT VALVE specializes in advanced research and innovation of high-temperature flue gas butterfly valves. To address these critical challenges, SNT VALVE has pioneered the introduction of a four- stemeccentric butterfly valve, revolutionizing the industry by replacing traditional tri- eccentric designs and offering a groundbreakingsolution withunmatched performance. Thisinnovation has been a game-changer, resolving long-standing issues, and earning the company two national patents: one for the four- stemeccentric butterfly valve (patent No. :ZL201520326489.1), and another for the catalytic device utilizing the four- stemeccentric butterfly valve (patent No. : ZL201921719624.3). In collaboration with the China Petroleum and Chemical Industry Federation,SNT commissioned a thorough product evaluation with the esteemed Changzhou University, culminating in arecognition as domesticindustry leaders.

<sup>Four-link Eccentric Butterfly Valve Application

The AOC-4000 series four-link eccentric butterfly valve, crafted by SNT, is the epitome of excellence for specialized conditions requiring precise regulation and shut-off solutions.
Introducing the AOC-4000 series: a marvel of engineering excellence in the world of valves. This four-link eccentric butterfly valve is meticulously crafted for scenarios demanding high-temperature resilience, large-diameter accommodation, and seamless high-flow performance, all while maintaining a low-pressure drop and exceptional sealing capabilities. Its planar sealing prowess ensures that valve jamming remains a relic of the past, even under the most intense thermal conditions. Experience rapid opening and closing, coupled with unmatched adjustment precision and sealing reliability. Perfectly suited for the regulatory or shut-off needs of pipeline media in the production of phthalic anhydride and maleic anhydride, this valve is also versatile enough to manage an array of gases and liquids, including hydrogen, ammonia, air, smoke, and gas within intricate pipeline systems. For media prone to crystallization, like sulfur, the innovative jacketed structure comes to the rescue, effectively preventing pipeline blockages due to cooling and condensation.

The AOC-4000 series redefines versatility with its array of actuator options designed to meet precise operational demands. While it typically features a cylinder-type single-acting actuator, adaptability is at the forefront with the availability of cylinder-type double-acting, electric, and hydraulic actuators based on specific requirements. Marvel at the swift shut-off times, efficiently reaching between 2 to 6 seconds, ensuring timely and responsive operational performance.</sup>




Working Principle

^{The sophisticated four-link butterfly valve consists of several integral components: a robust drive device, a precisely engineered valve plate, a durable valve body, a sturdy valve shaft, an advanced linkage system, and reliable shaft end seals. The dynamic opening and closing actions of the valve are expertly controlled by the drive device, which orchestrates the movement of the valve shaft and the four-link mechanism. To open, the valve shaft rotates, aligning the valve plate parallel to the pipeline center, indicating a fully open valve. Conversely, the reverse rotation closes the valve plate, achieving a fully closed state when the valve plate engages and compresses against the valve body's sealing surface, ensuring impeccable sealing.}

Product Specifications

Body: The robust construction of the valve body ensures superior strength and durability, providing a solid foundation for reliable operation in diverse applications. Crafted with precision to meet the highest standards of quality and functionality.

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 unparalleled connectivity with a maximum diameter of the connecting valve body reaching up to DN4000, ensuring seamless integration and robust performance.
• Our cutting-edge design features a unique four-stem structure and an innovative flat seal design, ensuring impeccable sealing efficiency and unmatched reliability.
• The external double bearing design is engineered to perfection, effectively preventing medium entry, thus averting potential blockages and ensuring smooth operation.
• Our precision-engineered drain valve effectively combats medium corrosion, offering long-lasting durability and resilience.
• With a high-temperature design capable of enduring up to 800 ºC
• Engineered with superior safety in mind, our API607 Fire Protection Design offers unmatched protection and peace of mind.
• The integral stem design with anti-center shaft out feature guarantees structural integrity and operational excellence.
• Incorporating an anti-static design, our product ensures enhanced safety and operational reliability.
• Our anti-misoperation design prevents inadvertent errors, ensuring accuracy and efficiency in every operation.
• Choose from multiple sealing structures, tailored to meet diverse operational needs and preferences.
• Our fabricated construction is designed for superior strength and innovation, catering to demanding applications with ease.
• In the initial and final stages of operation, the disc moves parallel to the body seat, ensuring a friction-free motion for seamless performance.
• Benefit from our various seat arrangements, each designed to offer versatility and adaptability for a range of applications.}
 

Product Range

^{★ Design standard: Our robust design meets AP1598, API607, and ASME B16.34 standards, ensuring unmatched quality and performance.
★ Standard size: Our valves are available in sizes from NPS12-160 (DN300-DN4000), perfectly catering to a wide array of applications.
★ Pressure class: Built to withstand pressures of PN2.5-PN20/ASME CLASS 150, our valves deliver superior durability.
★ Applicable temperature: Engineered for extreme conditions, they operate efficiently from -20 °C to 800 °C.
★ Leakage class: With leakage class ANSIB16.104VI, API598, enjoy the assurance of no leakage. no leakage
★ Body material: Made with ASTMA105A351CF8M/special alloys, providing exceptional strength and resilience.
★ Valve internals material: Crafted from A479-316; S2205; 17-4PH for enduring performance.
★ Operation mode: Choose from manual, pneumatic, electric, electro-hydraulic, and more for ultimate versatility.
★Our product range is flexible and can be expanded to meet your specific requirements.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. The exterior and interior of the valve body are expertly sandblasted, ensuring a pristine finish.
2. Post-sandblasting, the surface is impeccably smooth, providing superior adhesion for paint.
3. For media oxygen content um above 23.5%, only external sandblasting is necessary; internal sandblasting is omitted.•</sup>

<sup>• Painting after Surface Treatment
1. The standard painted surface withstands temperatures up to 450°C. For higher requirements, specialized treatment is available.
2. Dual layers of paint, each 35 micrometers thick, ensure robust protection against corrosion.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The valve plate's sealing surface can be fortified with welds of Hastelloy, or Stellited gr.6,
b) Hard coatings such as tungsten carbide can be applied, achieving a hardness rating of HRC60-70.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: Our valves are pivotal in sulfur tail gas recovery, offering enhanced efficiency and safety in managing sulfur emissions, ensuring compliance with environmental regulations.

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover: Engineered for precision and endurance, our valves excel in the complex environments of Sinochem Group's petrochemical incineration boiler crossover operations.stem: The robust stem design ensures durability and consistent performance, vital for the demanding conditions of petrochemical applications. Butterfly Valve: This advanced butterfly valve epitomizes superior engineering, providing an unmatched balance of strength and flexibility for diverse industrial uses.T: Tailored to perfection, each component of our butterfly valve meets rigorous standards for exceptional performance.The right: The right choice for industries demanding excellence, our valves deliver unmatched reliability and efficiency. figure: This figure represents the epitome of engineering excellence, showcasing the valve's sleek design and optimal functionality. is: Is a testament to our commitment to quality and innovation, ensuring each valve exceeds industry standards. used product after: Demonstrating the longevity and resilience of our valves, designed to perform flawlessly even after years of rigorous use. 4 years): Proven to maintain peak performance and reliability in critical operations even after 4 years.

Petro China 270,000 tons/year sulfur tail gas standard project: Proudly part of Petro China's sulfur tail gas recovery initiative, our valves are integral to achieving environmental goals and operational efficiency.

Catalytic flue gas turbine outlet butterfly valve instead of water seal tank: Innovatively replacing traditional methods, our valves enhance operational efficacy by efficiently managing catalytic flue gas turbine outlets.

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site: Our valves outperform in comparison, showcasing superior adaptability and efficiency in the heat recovery boiler sites of SINOPEC.

Images from the scene: Capture the essence of our expert craftsmanship and innovative solutions in action, highlighting their indispensable role in the field. of: Of unparalleled quality and unbeatable performance, our valves are the ideal solution for industrial challenges. SINOCHEM GROUP: Collaborating with industry giants like Sinochem Group, our valves are engineered to meet the highest standards of petrochemical operations. Refining and Chemical: Our butterfly valves are leaders in refining and chemical industries, supporting seamless processes and enhancing output quality. Catalytic flue gas turbine outlet: Designed to maximize efficiency, our valves are crucial in the operation of catalytic flue gas turbine outlets, optimizing performance and safety. to chimney: From turbine to chimney, our valves ensure a secure and efficient flow, safeguarding both the environment and operational integrity.

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. emerges as a pioneering producer of control valves, expertly integrating manufacturing, design, sales, and service into one seamless operation. With a strong foundation and rapid development, SNT is strategically located in Qingdao, Shandong Province, sprawling over an impressive 42,000 square meters. Our state-of-the-art workshops and cutting-edge production equipment position us as a high-tech enterprise with independent intellectual property and advanced international management practices. Boasting a dedicated workforce of over 150, with 15% specializing in R&D and 30% possessing graduate or higher degrees, we excel in producing top-tier valves for the petrochemical, oil, and coal chemical industries. Powered by an exceptional production management team and innovative research, SNT achieved a remarkable sales value approaching 100 billion in 2017.

SNT proudly holds the TS special equipment manufacturing certificate and ISO 9001 accreditation, alongside net qualification certifications from SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our commitment to innovation has garnered numerous national patents across various technologies. Expertly designed to meet ANSI, API, DIN, BS, and JIS standards, our comprehensive valve range includes 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. Drive mechanisms span manual, power-driven, pneumatic, and hydraulic options. Core material specifications encompass A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M with sizing from 1/2" to 120", pressures from ANSI 150# to 2500#, and temperatures ranging from -196ºC to 1100ºC.

Leveraging advanced production technology, meticulous management, and a robust quality assurance system, SNT valves are widely adopted across the petrochemical, oil, steel & iron, paper manufacturing, and power station industries. Our esteemed customers include SINOPEC Qilu Branch, SINOPEC Qingdao Branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi Branch, PETROCHINA Ningxia Branch, SINOPEC Changling Branch, and Jinan Branch, among others.

Prioritizing our customers' success, we are devoted to establishing a reputation for exceptional quality and a trusted brand. Our comprehensive quality assurance and after-sales support systems ensure that SNT valves not only meet but exceed expectations, fostering enduring partnerships and mutual prosperity with our clients.</sup>