Premium Four Lever Offset Shutoff Butterfly Valves, Nps 12-160" Range

• 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 state-of-the-art AOC-4000 series four-link eccentric butterfly valve, a revolutionary solution designed to excel in demanding environments characterized by high-temperature, large-diameter, and high-flow scenarios. Crafted for minimal pressure drop and superior sealing capabilities, this valve ensures zero-leakage performance, even under challenging conditions. Its exceptional planar sealing technology prevents jamming at elevated temperatures, offering rapid and precise operation with remarkable reliability. Ideal for managing pipeline media in the production of phthalic and maleic anhydride, this versatile valve also efficiently regulates other gases and liquids, including hydrogen, ammonia, air, smoke, and various gases within pipeline systems. For media susceptible to crystallization, such as sulfur, an innovative jacketed structure is available, safeguarding against potential pipeline blockages due to cooling or condensation during flow, ensuring seamless and uninterrupted operations.

The adaptable AOC-4000 series four-link eccentric butterfly valve is customarily equipped with a high-performance cylinder-type single-acting actuator, delivering superior control and efficiency. However, the design allows for flexibility, offering alternatives such as cylinder-type double-acting actuators, electric actuators, or hydraulic actuators, tailored to meet specific operational demands. This adaptability ensures that the valve's minimum shut-off time is optimized, achieving rapid closure within an impressive range of 2 to 6 seconds, thus enhancing overall system responsiveness and reliability.</sup>




Working Principle

^{The sophisticated operation of the four-link butterfly valve is a marvel of engineering, comprising a drive device, valve plate, valve body, valve shaft, linkage system, and precision-engineered shaft end seals. The drive mechanism propels the valve shaft, seamlessly engaging the four-link system to facilitate the valve's opening and closing actions. As the valve shaft rotates, the valve plate is strategically maneuvered to an open position, aligning perfectly with the pipeline center for maximum flow. Conversely, the reverse rotation effectuates the closure of the valve plate, achieving a secure lock when the plate meets and compresses against the sealing surface of the valve body, ensuring a complete and tight seal when fully closed, thereby maintaining optimal performance and integrity.}

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

^{• Experience the strength and reliability with a maximum diameter of connecting valve body reaching an impressive DN4000.
• Discover the ingenuity of our unique four-stem architecture, featuring a cutting-edge flat seal design that ensures precision and efficiency.
• Our innovative external double bearing design skillfully prevents medium entry into the bearing, effectively avoiding blockage.
• The thoughtfully designed drain valve acts as a vigilant guardian, preventing medium-induced corrosion and ensuring durability.
• Engineered to withstand extreme conditions with a high temperature design capable of enduring up to 800 ºC.
• Built with a steadfast commitment to safety, incorporating API607 Fire Protection Design for assured protection.
• Features an integral stem design with anti-center shaft out mechanisms for enhanced security.
• Equipped with an anti-static design, safeguarding operations against electrostatic discharges.
• Thoughtfully integrated anti-misoperation design to prevent accidental mishandlings.
• Offers multiple sealing structures, providing versatile options tailored to your specific needs.
• Fabricated with precision and expertise, the construction reflects superior craftsmanship.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat, offering a sophisticated friction-free motion.
• Featuring a variety of seat arrangements, catering to diverse operational requirements.}
 

Product Range

^{★ Design standard: Crafted meticulously to meet AP1598, API607, and ASME B16.34 standards, ensuring pinnacle performance.
★ Standard size: Available in an extensive size range from NPS 12" to 160" (DN300-DN4000), catering to diverse applications.
★ Pressure class: Accommodating pressure from PN2.5 to PN20/ASME CLASS 150, perfect for varied pressure requirements.
★ Applicable temperature: Designed to withstand temperatures from -20 °C to a soaring 800 °C, ideal for extreme conditions.
★ Leakage class: Conforms to ANSI B16.104 VI and API 598 standards, ensuring impeccable sealing with no leakage. no leakage
★ Body material: Engineered from ASTM A105, A351 CF8M, and special alloys for superior durability.special alloy, etc.
★ Valve internals material: Utilizing A479-316, S2205, and 17-4PH for top-notch internal components.
★ Operation mode: manual, versatile operational modes including pneumatic, electric, and electro-hydraulic, tailored for your convenience.
★Product range can be expanded according to user needs, offering customizable solutions.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5: Exceptional Quality for Optimal Performance
1. Comprehensive sandblasting applied to both the interior and exterior surfaces of the valve body, ensuring thorough coverage.
2. Achieve a fine surface finish post-sandblasting, providing an ideal base for paint with superior adhesion.
3. When the oxygen content in the mediumum exceeds 23.5%, prioritize external sandblasting as internal sandblasting becomes redundant.•</sup>

<sup>• Painting after Surface Treatment: Expanding Protective Capabilities
1. Standard painted surfaces can withstand temperatures up to 450°C. For environments exceeding this, specialized treatments are available.
2. Apply two coats of paint, each 35 micrometers thick, to offer enhanced corrosion resistance.

• Hard Alloy Surfacing on Sealing Surface: Unmatched Resilience and Strength of Valve Plate
a) The valve plate's sealing surface can be fortified with durable materials such as Hastelloy or Stellited gr.6,
b) Experience maximum hardness with tungsten carbide and other hard alloy spraying, achieving HRC60-70 for top-tier durability.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Four-stem Butterfly Valve (The right figure is used product after 4 years)

Petro China 270,000 tons/year sulfur tail gas standard project

Catalytic flue gas turbine outlet butterfly valve instead of water seal tank

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site

Images from the scene of SINOCHEM GROUP Refining and Chemical catalytic flue gas turbine outlet to chimney

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a prestigious producer of control valves, seamlessly integrating manufacturing, design, sales, and service under one esteemed brand. With a high starting point and swift development, SNT is strategically located in the vibrant city of Qingdao, Shandong province, sprawling across an impressive 42,000 square meters. Our state-of-the-art workshops and cutting-edge production equipment testify to our commitment to excellence. As a trailblazing high-tech enterprise, we boast independent intellectual property rights and leverage advanced international management and production experience. Our dynamic team comprises over 150 dedicated employees, with 15% specializing in R&D, and 30% holding graduate or higher degrees. Our high-quality production management team and innovative research drive the large-scale production of top-tier valves for the petrochemical, oil, and coal chemical industries. We proudly achieved a sales milestone of nearly 100 billion in 2017.

SNT has proudly obtained the TS special equipment manufacturing certificate and ISO 9001, alongside net qualification certifications from esteemed giants like SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our technological advancements have garnered numerous National Patents. We expertly design and manufacture a comprehensive range of valves adhering to ANSI, API, DIN, BS, JIS standards. By synthesizing the best features of globally renowned valves and our independent R&D, 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, and Cryogenic Valves. Our valves are driven manually, electrically, pneumatically, or hydraulically. Main materials include A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, offering specifications from 1/2" to 120", working pressures ANSI 150# to 2500#, and temperatures from -196ºC to 1100ºC.

Leveraging advanced production technology and a robust quality assurance system, SNT valves are extensively utilized across industries such as petrochemical, oil, steel, iron, paper manufacturing, and power stations. Our distinguished clientele includes SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Changling branch, and many more. These collaborations underscore our reliability and commitment to excellence.

We prioritize our users' profitability, dedicating ourselves to establishing superior quality and a reputable brand. Our impeccable quality assurance and after-sales systems ensure that SNT valves form lasting partnerships with customers, driving mutual growth and shared prosperity.</sup>