DN300-DN4000/Pneumatic Four Lever Offset Shutoff Butterfly Valves, Perfect for Pressure Class 150 Systems

• 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 stands unrivaled in its class, designed specifically to excel in high-temperature, large-diameter, and high-flow environments. With superior capabilities to handle low-pressure drop and ensure minimal to zero leakage, it is your ultimate solution for demanding applications. The valve's remarkable planar sealing performance eliminates the risk of jamming under intense heat, ensuring smooth and reliable operation. Experience the benefits of rapid opening and closing, coupled with high adjustment precision and steadfast sealing, making it the ideal choice for regulating or shutting off pipeline media in the intricate production processes of phthalic anhydride and maleic anhydride. Its versatility extends to controlling various other gases and liquids, including hydrogen, ammonia, air, smoke, and gas in pipeline systems. For media susceptible to crystallization, such as sulfur, a specialized jacketed structure is available to prevent pipeline obstructions caused by cooling and condensation, safeguarding the integrity of your flow.</sup>

^{The AOC-4000 series is typically paired with a cylinder-type single-acting actuator, offering robust and reliable performance. However, it also provides the flexibility to accommodate cylinder-type double-acting actuators, electric actuators, and hydraulic actuators, allowing customization to meet your precise operational needs. Remarkably, the minimum shut-off time for this system can be achieved in a swift (2-6) seconds, ensuring efficiency and effectiveness in your processes.}




Working Principle

^{The four-link butterfly valve is ingeniously designed, comprising a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The drive device orchestrates the movement of the valve shaft and the four-link mechanism, dictating the opening and closing of the valve. As the valve shaft rotates, the valve plate transitions to an open state when aligned parallel to the pipeline center, allowing for unobstructed flow. Conversely, the reverse rotation leads to the closure of the valve plate. When the valve plate comes into contact with and compresses the sealing surface of the valve body, the valve achieves a fully closed status, guaranteeing secure and leak-free operation.}

Product Specifications

Body: Crafted with precision and unparalleled attention to detail, the body of our Four Lever Offset Shutoff Butterfly Valves is designed to deliver exceptional performance and unwavering reliability. Built to withstand the rigors of Pressure Class 150 systems, it ensures a robust and durable solution for your industrial needs.

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 for connecting the valve body, reaching up to DN4000, these valves demonstrate exceptional adaptability and reliability.
• Ingeniously crafted with a unique four-stem structure design and an advanced flat seal design, ensuring seamless operational performance.
• An innovative external double bearing design effectively prevents medium from entering the bearings, thus eliminating any risk of blockages and enhancing long-term functionality.
• Equipped with a strategic drain valve that actively prevents corrosion from the medium, safeguarding the valve's integrity.
• Engineered for high temperature endurance, capable of withstanding conditions up to an impressive 800 ºC, ensuring performance in the most demanding environments.
• Incorporates API607 Fire Protection Design, providing enhanced safety and peace of mind.
• Featuring an integral stem design with an innovative anti-center shaft out mechanism, enhancing operational security.
• Equipped with an anti-static design to preserve operational safety and reliability.
• A thoughtful anti-misoperation design, adding an extra layer of operational security.
• Offers multiple sealing structures for customization, ensuring tailored solutions to meet diverse needs.
• Crafted with precision in a fabricated construction, ensuring durability and quality.
• The disc's movement is engineered for perfection; it moves parallel to the body seat in both the initial opening and final closing stages, providing a friction-free motion that ensures longevity.
• Offers a variety of seat arrangements, allowing for versatile applications and installations.}
 

Product Range

^{★ Design standard: AP1598, API607, ASME B16.34
★ Standard size: NPS 12-160 (DN 300-DN 4000)
★ Pressure Class: PN 2.5-PN 20 / ASME CLASS 150
★ Applicable temperature range: From -20°C to an impressive 800°C
★ Leakage Class: ANSI B16.104 VI, API 598 ensures zero leakage
★ Body crafted from premium materials: ASTM A105, A351 CF8M,and other special alloys.
★ Valve internals constructed with materials: A479-316, S2205, 17-4PH
★ Operation mode available: manual, pneumatic, electric, electro-hydraulic, and more.
★Our product range is flexible and can be expanded to meet your specific requirements.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5: The Ultimate Shield
1. Experience the meticulous sandblasting of the entire valve body, inside and out, providing unparalleled protection.
2. Revel in the refined surface achieved post-sandblasting, ensuring robust paint adhesion and enhanced durability.
3. For media with an oxygen content exceeding 23.5%, external sandblasting is sufficient, eliminating the need for internal treatment.•</sup>

<sup>• Painting: A Vivid Expression of Quality and Endurance After Thorough Surface Treatment
1. Our standard painted surfaces can withstand temperatures up to 450°C, with options for higher temperatures treated separately to meet your specific needs.
2. Enjoy the double layer of paint, each 35 micrometers thick, offering exceptional corrosion protection for long-lasting performance.

• Hard Alloy Surfacing on the Sealing Surface of the Valve Plate: Excellence in Sealing Achieved
a) Opt for welding with Hastelloy or Stellited gr.6 to ensure a formidable sealing surface.
b) Choose tungsten carbide and other hard alloy spraying for an incredible hardness of HRC60-70, delivering resilience and strength.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: Enhance Efficiency with Our Advanced Solutions

SINOCHEM GROUP's Petrochemical Incineration Boiler Crossover - An Unprecedented AdvancementStem Engineering Excellence Butterfly Valve (Crafted with Precision and Innovation)Tailored to Perfection: TheRight Choice for Your Engineering Needs is a testament to our used product durability and innovation; trusted after 4 remarkable years)

Petro China's 270,000 tons/year Sulfur Tail Gas Standard Project: Redefining Efficiency

Catalytic Flue Gas Turbine Outlet Butterfly Valve: A Superior Alternative to Traditional Water Seal Tanks

An Insightful Comparison: SINOPEC Catalytic Flue Gas Turbine Outlet to Heat Recovery Boiler Site

Captivating Images from the Scene of Innovation at SINOCHEM GROUP's Cutting-edge Refining and Chemical Operations Catalytic Flue Gas Turbine Outlet: Elevating Standards Directing to Chimney with Precision and Reliability

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd is a renowned producer of high-performance control valves, seamlessly integrating manufacturing, design, sales, and service under one roof. Situated in the vibrant city of Qingdao, Shandong province, our expansive 42,000 square meter facility is a hub of innovation, equipped with state-of-the-art workshops and production equipment. As a distinguished high-tech enterprise, we proudly hold independent intellectual property rights and benefit from imported advanced management and production expertise. Our dynamic team of over 150 skilled workers includes 15% research and development specialists and 30% graduates or individuals with higher degrees. Driven by a commitment to excellence, we specialize in producing a vast array of top-quality valves, serving the petrochemical, oil, and coal chemical sectors. Our dedication to quality and innovation has propelled us to achieve a remarkable sales milestone, reaching nearly 100 billion in the year 2017.

SNT has proudly obtained the TS special equipment manufacturing certificate and ISO 9001 certification. Additionally, we have secured the net qualification certificates from industry giants SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our groundbreaking innovations are recognized with numerous National Patents across various technologies. We expertly design and manufacture an extensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By merging the best attributes of globally acclaimed valves with our own cutting-edge research and development, we produce a comprehensive selection of valves, including GLOBE Valves, 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. Our versatile drive mechanisms encompass manual, power-driven, pneumatic, and hydraulic options. Premium materials such as A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M are used for key components. Specifications range from 1/2" to 120", with working pressures from ANSI 150# to 2500#, and temperature tolerances between -196ºC to 1100ºC.

Backed by cutting-edge production technology, meticulous management, and a robust quality assurance system, SNT Valves have become the choice of excellence across industries including petrochemical, oil, steel, iron, paper manufacturing, and power generation. Our prestigious clientele features respected names such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, and Jinan branch, among others. Each partnership stands as a testament to our unwavering commitment to quality and reliability.

At SNT, we place our customers' success at the forefront of our mission, dedicating ourselves to the pursuit of exceptional quality and a prestigious brand reputation. Our comprehensive quality assurance and unparalleled after-sales support systems ensure that SNT valves foster enduring partnerships, paving the way for shared success and prosperity.</sup>