Versatile Four Lever Offset Shutoff Butterfly Valves, ASME Class 150

• 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, a marvel of engineering in four-link eccentric butterfly valves designed to excel in demanding environments. Perfectly suited for high-temperature, large-diameter, and high-flow applications, this valve minimizes pressure drops while ensuring low to zero leakage. Its superior planar sealing capabilities eliminate the risk of valve jamming, even under extreme heat. Enjoy swift opening and closing actions, precise adjustment capabilities, and steadfast sealing reliability, making it an ideal choice for managing pipeline media in the production of phthalic and maleic anhydride. Beyond these, it adapts seamlessly to control a variety of gases and liquids, including hydrogen, ammonia, air, and smoke, in pipeline networks. For media prone to crystallization, such as sulfur, an innovative jacketed design is available to prevent blockages caused by cooling and condensation, ensuring uninterrupted flow.

The AOC-4000 series boasts versatility with its standard cylinder-type single-acting actuator, tailored for efficiency. However, it accommodates a range of actuator options, including cylinder-type double-acting, electric, and hydraulic actuators, to meet diverse operational requirements. Experience rapid shut-off times, achieving closure in as little as 2 to 6 seconds, ensuring quick and efficient operation.</sup>




Working Principle

^{The sophisticated design of the four-link butterfly valve integrates crucial components such as a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. Operational dynamics involve the drive device energizing the valve shaft alongside the four-link mechanism. As the valve shaft turns, it opens the valve plate, aligning it with the pipeline center for a fully open state. Reversing this rotation closes the valve plate, precisely sealing it against the valve body's surface to secure a fully closed position, ensuring optimal control over the flow.}

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

^{• Boasting an impressive maximum diameter, the connecting valve body can reach up to DN4000, catering to large-scale applications.
• Our revolutionary four-stem structure design is crafted with a flat seal design for enhanced durability and efficiency.
• The innovative external double bearing design effectively prevents medium infiltration, avoiding potential blockages and ensuring seamless performance.
• The strategically designed drain valve offers robust resistance against medium corrosion, enhancing longevity.
• Engineered for extreme conditions, this high-temperature design withstands up to 800 ºC, ensuring reliability under intense heat.
• Incorporating API607 Fire Protection Design, these valves provide added safety and peace of mind.
• The integral stem design features an anti-center shaft out design for enhanced operational stability.
• Engineered with anti-static capabilities, these valves ensure secure and safe operations.
• Anti-misoperation design reduces the risk of operational errors, promoting user safety and efficiency.
• Choose from multiple sealing structures to tailor the valve to specific industrial needs.
• Our fabricated construction guarantees superior quality and resilience for demanding environments.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat, ensuring a friction-free motion that enhances efficiency and prolongs service life.
• Various seat arrangements are available to meet diverse operational requirements.}
 

Product Range

^{★ Design standard: Crafted with precision, meeting rigorous AP1598, API607, ASME B16.34 standards to ensure exceptional durability and safety.
★ Standard size: Available in a wide range of sizes from NPS 12-160 (DN 300-DN 4000), providing flexibility and adaptability for various applications.
★ Pressure class: Built to withstand pressures of PN 2.5-PN 20 / ASME CLASS 150, ensuring robust performance under demanding conditions.
★ Applicable temperature: Engineered to perform in extreme temperatures from -20°C to 800°C, making them ideal for challenging environments.
★ Leakage class: Adheres to ANSIB16.104 VI, API598 standards, guaranteeing minimal to no leakage for superior operational efficiency. no leakage
★ Body material: Carefully constructed using high-quality ASTMA105, A351 CF8M,and special alloys to provide unmatched strength and longevity.
★ Valve internals material: Featuring resilient materials like A479-316, S2205, 17-4PH for enduring performance.
★ Operation mode: manual, pneumatic, electric, electro-hydraulic, etc.
★Product range can be expanded according to user needs, ensuring we meet the specific demands of your projects with precision-engineered solutions.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Experience the meticulous artistry of sandblasting as both the interior and exterior of the valve body are expertly treated.
2. This process not only ensures a refined surface finish but also significantly enhances the paint adhesion strength.
3. In cases where the oxygen content in the medium exceeds 23.5%, only the external surfaces undergo sandblasting. Internal sandblasting is deemed unnecessary.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painted surfaces boast temperature resistance up to 450°C, with options available for treatment at even higher temperatures.
2. A double-layer coating application, each 35 micrometers thick, provides robust protection against corrosion.

• Hard Alloy Surfacingon Sealing Surface of Valve Plate
a) Enhance the durability of the valve plate sealing surface with welding options including Hastelloy and Stellited gr.6.
b) Opt for tungsten carbide and other hard alloy spray treatments, achieving remarkable hardness levels of HRC60-70.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: Effortlessly streamline your sulfur tail gas recovery processes with our precision-engineered valve solutions.

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Four-stem: Our robust products are a pivotal component in SINOCHEM GROUP's advanced petrochemical incineration systems.Butterfly Valve (stem): The superior design of our butterfly valve stems ensures optimal performance and durability in demanding industrial applications. Butterfly Valve (The right figure is used product after 4 years): This product demonstrates exceptional longevity, maintaining its integrity and performance even after four years of rigorous use.

Petro China 270,000 tons/year sulfur tail gas standard project: Our valves are integral to the efficiency and success of Petro China's high-capacity sulfur tail gas project.

Catalytic flue gas turbine outlet butterfly valve instead of water seal tank: Enhance operational efficiency by replacing traditional water seal tanks with our cutting-edge catalytic flue gas turbine outlet butterfly valves.

Comparison of SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site: Examine the transformative impact of our products within SINOPEC's state-of-the-art catalytic flue gas and heat recovery systems.

Images from the scene: Real-world images capturing the excellence and reliability of our butterfly valves in action. of SINOCHEM GROUP Refining and Chemical: Partnering with leading refining and chemical industries to deliver unparalleled valve performance. Catalytic flue gas turbine outlet to chimney: Experience seamless operations from the catalytic flue gas turbine outlet to the chimney with our high-performance solutions.

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd., a luminary in the field of control valves, seamlessly integrates manufacturing, design, sales, and services under one expansive umbrella. Embarking on a path of high-caliber, rapid growth, SNT is strategically situated in the vibrant hub of Qingdao, Shandong Province, sprawling over an impressive 42,000 square meters. The company boasts state-of-the-art workshops equipped with cutting-edge production technology. Recognized as a high-tech enterprise, SNT holds independent intellectual property rights and leverages imported, advanced management and production methodologies. With an impressive team exceeding 150 employees, including a remarkable 15% dedicated to R&D and 30% holding graduate or higher degrees, SNT thrives on an innovative production management team and groundbreaking technological research and development. This enables the production of voluminous quantities of superior quality valves widely utilized in the petrochemical, oil, and coal chemical sectors. SNT celebrated a landmark sales value approaching 100 billion in the year 2017.

SNT proudly holds the coveted TS special equipment manufacturing certificate and ISO 9001, while also securing the net qualification certificate from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our national patents span numerous cutting-edge technologies. We expertly design and manufacture a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By amalgamating global valve advantages with our proprietary R&D, SNT achieves mastery in crafting diverse valve types, 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 operable through various driving forms: manual, power-driven, pneumatic, and hydraulic. Key component materials include A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M, with specifications ranging from 1/2" to 120", working pressures of ANSI 150# to 2500#, and temperatures spanning -196ºC to 1100ºC.

Harnessing advanced production technology management and a robust quality assurance system, SNT Valves are trusted and extensively employed across a spectrum of industries, including petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele comprises industry leaders such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, and SINOPEC Changling branch, among others, solidifying our reputation in the market.

Prioritizing our users' profits, we are fervently committed to establishing unparalleled quality and a distinguished brand. Our meticulous quality assurance and comprehensive after-sales support systems ensure that SNT valves forge enduring partnerships with our clients, paving the way for shared prosperity and success.</sup>