Nps12′′-160′′/ASTM A105 A351 CF8m for Valve Body Materials/Four Lever Offset Shutoff Butterfly Valves, Perfect for DN300-DN4000 Sizes

• 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, an exceptional four-link eccentric butterfly valve engineered for the most demanding conditions. Whether you face high temperatures, require large-diameter solutions, or demand high-flow capabilities, this valve excels in maintaining a minimal pressure drop and ensuring low to zero leakage. The AOC-4000's superior planar sealing technology safeguards against valve jamming even at the highest temperatures, providing swift opening and closing, impeccable adjustment precision, and unwavering sealing reliability. This makes it an ideal choice for precise control or complete shut-off of pipeline media, particularly in the complex production processes of phthalic anhydride and maleic anhydride. Moreover, it seamlessly manages other gases and liquids, including hydrogen, ammonia, air, smoke, and gas within intricate pipeline systems. For media susceptible to crystallization, like sulfur, a specialized jacketed structure is available to prevent blockages due to cooling and condensation during flow, ensuring uninterrupted operation.

Standard with the AOC-4000 series, the cylinder-type single-acting actuator is your go-to for reliable performance. However, the versatility of this series allows you to choose from cylinder-type double-acting actuators, electric actuators, or hydraulic actuators, tailoring your selection to meet specific operational requirements. Remarkably, the minimum shut-off time impressively ranges from as little as 2 to 6 seconds, ensuring rapid operational efficiency and responsiveness.</sup>




Working Principle

^{The sophisticated design of the four-link butterfly valve includes a high-performing drive device, a robust valve plate, a durable valve body, a precisely engineered valve shaft, an efficient linkage system, and secure shaft end seals. The opening and closing mechanism is ingeniously powered by the drive device, orchestrating the movement of the valve shaft and the four-link assembly. As the valve shaft rotates, it elegantly swings open the valve plate, achieving a fully open state when aligned parallel to the pipeline center. Conversely, the reverse rotation securely closes the valve plate, achieving complete closure when the valve plate compresses against the valve body's sealing surface, ensuring a dependable seal.}

Product Specifications

Body: Engineered with superior materials and precision craftsmanship, the valve body guarantees robustness and longevity, making it an ideal choice to withstand demanding environments and ensure seamless operation.

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

^{• Achieve unparalleled connection with valve bodies up to a robust DN4000!
• Ingenious four-stem structure and sophisticated flat seal design for seamless operations
• External double bearing system ingeniously blocks medium ingress, avoiding any obstructions
• Smartly designed drain valve guards against medium corrosion
• Advanced high-temperature endurance up to a scorching 800 ºC
• API607 certified Fire Protection for utmost safety
• Unified integral stem design with anti-center shaft displacement
• Innovative anti-static design to prevent static buildup
• Safeguard against errors with anti-misoperation design
• Choose from multiple sealing structures tailored to your needs
• Expertly crafted with fabricated construction techniques
• Experience friction-free motion with parallel disc movement at initial opening and final closing stages
• Offers a variety of seat arrangements for customized solutions}
 

Product Range

^{★ Design standard: AP1598, API607, ASME B16.34
★ Standard size: NPS12-160 (DN300-DN4000)
★ Pressure class: PN2.5-PN20 / ASME CLASS 150
★ Applicable temperature: -20°C to 800°C
★ Leakage class: ANSI B16.104 VI, API598 no leakage
★ Body material: ASTM A105, A351 CF8Mand special alloys, etc.
★ 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>• Advanced Sand Blasting Surface Treatment to SA2.5 Standards
1. Complete sandblasting of both internal and external surfaces of the valve body
2. Achieves a refined finish with superior paint adherence post-sandblasting
3. For media withan O2 content exceeding 23.5%, only external sandblasting is necessary•</sup>

<sup>• Impeccable Painting after Comprehensive Surface Preparation
1. Standard painted surfaces endure temperatures up to 450°C, with options available for higher thermal conditions
2. Dual-layer paint application at 35 micrometers thickness provides robust corrosion resistance

• Durable Hard Alloy Surface Coatingon the Sealing Surfaceof the Valve Plate
a) Sealing surfaces can be fortified with Hastelloy or Stellited gr.6, offering enhanced durability
b) Tungsten carbide and other hard alloys are applied, achieving hardness levels of HRC60-70</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: An Essential Solution for Cleaner Energy

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Four-stem: A Vital Component in Modern Industrial Processes Butterfly Valve (The right figure: A Benchmark of Excellence in Design and Functionality is utilized with exceptional quality and reliability after 4 years, proving its durability and efficiency

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

catalytic flue gas turbine outlet butterfly valve, replacing traditional water seal tank for superior performance

Compare the advanced SINOPEC catalytic flue gas turbine outlet to heat recovery boiler site

Captivating Images from the Forefront of Industrial Excellence of SINOCHEM GROUP Refining and Chemical: A Beacon of Innovation catalytic flue gas turbine outlet: Ensuring Efficiency and Environmental Responsibility to chimney: A Gateway to Enhanced Emission Control

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a distinguished leader in the production of control valves, seamlessly integrating manufacturing, design, sales, and service. With a strong foundation and rapid development, SNT is strategically located in Qingdao, Shandong province, spanning a vast 42,000 m2 and equipped with state-of-the-art workshops and production facilities. As a high-tech enterprise, we boast independent intellectual property rights and leverage advanced management and production practices from around the globe. Our dedicated team of over 150 professionals includes R&D specialists who make up 15% of our workforce, while 30% are graduates or hold higher degrees. Through exceptional production management and cutting-edge technology development, we consistently deliver superior valves for the petrochemical, oil, and coal chemical sectors. Our commitment to excellence yielded nearly a 100 billion sales value in 2017.

SNT proudly holds the TS special equipment manufacturing certificate and ISO 9001 certification, along with net qualification certificates from industry giants SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our innovative prowess is further highlighted by numerous national patents. We expertly design and produce a comprehensive range of valves in compliance with ANSI, API, DIN, BS, and JIS standards. By combining the strengths of renowned valves worldwide with our own R&D, we manufacture an array of valve types: 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. Our versatile driving forms include manual operation, power-driven, pneumatic, and hydraulic systems. Key components are crafted from premium materials such as A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M, with specifications ranging from 1/2" to 120" and capable of withstanding pressures of ANSI 150#~2500# and temperatures from -196ºC to 1100ºC.

Thanks to our advanced production technology, management expertise, and rigorous quality assurance systems, SNT Valves have become a staple in industries like petrochemical, oil, steel & iron, paper manufacturing, and power stations. Esteemed customers, including SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Changling branch, and Jinan branch, trust our products for their reliability and excellence.

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