Flanged Durable Offset Shutoff Butterfly Valves for High-Pressure Applications with Carbon Steel Materials

• 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 remarkable creation in the realm of four-link eccentric butterfly valves. Engineered to excel in the most demanding environments, this valve is your go-to solution for high-temperature, large-diameter, high-flow situations where low-pressure drop and minimal leakage are paramount. It boasts exceptional planar sealing performance, effectively preventing any valve jamming even under extreme heat. With its rapid opening and closing capabilities, precise adjustment accuracy, and dependable sealing, this valve is tailor-made for regulating or entirely shutting off pipeline media, especially in the intricate production processes involving phthalic anhydride and maleic anhydride. Beyond that, it's adept at controlling a wide array of gases and liquids, including hydrogen, ammonia, air, smoke, and gas within pipeline systems. For media at risk of crystallization, like sulfur, opt for the jacketed structure to thwart pipeline clogs caused by cooling and condensation during flow.</sup>

^{The AOC-4000 series is typically paired with a cylinder-type single-acting actuator, ensuring smooth operation. However, customization options abound with the ability to opt for cylinder-type double-acting actuators, electric actuators, or hydraulic actuators based on specific operational demands. Notably, the valve's shut-off time can be impressively short, ranging from a swift 2 to 6 seconds.}




Working Principle

^{The four-link butterfly valve is a marvel of mechanical precision, comprising core components such as the drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The opening and closing operations are elegantly orchestrated by the drive device, which propels the valve shaft and the ingenious four-link mechanism. As the valve shaft rotates, it initiates the opening of the valve plate, achieving a fully open position when the plate aligns parallel with the pipeline center. To close, the valve shaft rotates in reverse, and the valve plate moves to meet and compress against the valve body's sealing surface, achieving a complete seal and closure.}

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 a robust maximum diameter of connecting valve body reaching up to DN4000, this valve ensures superior performance in demanding applications.
• Engineered with a unique four-stem structure and innovative flat seal design, this valve offers enhanced sealing capability.
• The smart external double bearing design effectively prevents medium intrusion, thereby eliminating blockages and enhancing longevity.
• Incorporating a drain valve that expertly guards against medium corrosion, prolonging the life of the valve.
• Tailored for extreme conditions with a high temperature design that withstands up to 800 ºC, ensuring reliability under pressure.
• Equipped with API607 Fire Protection Design, offering an added layer of safety and compliance.
• Featuring an integral stem design and anti-center shaft out mechanism, this valve stands as a paragon of safety and precision.
• Incorporates an advanced anti-static design for heightened operational safety.
• Meticulously crafted to include an anti-misoperation design, minimizing the risk of operational errors.
• Offers multiple sealing structures for versatility across diverse applications.
• Precision in fabrication results in a construction that is as durable as it is reliable.
• At the initial stage of opening and the final stage of closing, the disc moves parallel to the body seat, providing a friction-free motion.
• Offers various seat arrangement options to cater to specific needs.}
 

Product Range

^{★ Design Standard: Built to international benchmarks: AP1598, API607, ASME B16.34
★ Standard Size: Ranging from NPS12-160 (DN300-DN4000)
★ Pressure Class: Robust PN2.5-PN20/ASME CLASS 150
★ Applicable Temperature: Efficiently operates between -20°C and 800°C
★ Leakage Class: Adheres to ANSI B16.104 VI, API 598 standards With zero leakage
★ Body Material: Crafted from ASTM A105, A351 CF8M,and includes special alloys, providing durability and resilience.
★ Valve Internals Material: A479-316, S2205, 17-4PH ensuring strength and reliability
★ Operation Mode: Offers flexible operation with manual, pneumatic,electric, electro-hydraulic options, etc.
★Product range is adaptable and can be expanded according to user needs, ensuring customized solutions for every application.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5: The Pinnacle of Surface Perfection
1. The valve body is meticulously sandblasted both inside and out, ensuring a flawless finish.
2. Experience the unparalleled texture and robust paint adhesion resulting from our refined sandblasting technique.
3. For environments where the O2 content exceeds 23.5%, our advanced protocol only requires external sandblasting, rendering the internal process unnecessary.•</sup>

<sup>• Painting after Surface Treatment: Unleashing Exceptional Heat Resistance
1. Our standard painted surfaces withstand temperatures up to a remarkable 450°C, with custom treatments available for even higher thresholds.
2. Our dual-layer, 35-micrometer thick paint application offers superior corrosion resistance.

• Hard Alloy Surfacing on Sealing Surface for Unmatched Strength of Valve Plate
a) The valve plate's sealing surface can be expertly welded with materials such as Hastelloy and Stellited gr.6,
b) Utilizing tungsten carbide and other hard alloy sprays to achieve a formidable hardness of up to HRC60-70.</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 used instead of traditional 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 distinguished and innovative producer of high-quality control valves. Integrating world-class manufacturing, cutting-edge design, comprehensive sales, and exceptional services, SNT stands out with a high starting point and rapid development trajectory. Situated in the vibrant city of Qingdao, Shandong province, the company boasts an expansive area of 42,000 square meters, housing state-of-the-art workshops and production facilities. As a high-tech enterprise, SNT possesses independent intellectual property rights and employs advanced management and production practices drawn from global leaders. With a dedicated team of over 150 employees, including a robust R&D department comprising 15% of staff, and 30% holding graduate or higher degrees, SNT excels in producing superior valves. Our products are tailored for the intricacies of the petrochemical, oil, and coal chemical sectors, contributing to a remarkable sales value nearing 100 billion in 2017.

SNT proudly holds the TS Special Equipment Manufacturing Certificate and ISO 9001 certification, alongside net qualification certificates from industry giants like SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our innovative spirit has led to several National Patents. With the capability to design and manufacture a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards, SNT harmonizes global valve excellence with its own research and development prowess. Our extensive product lineup includes 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, and Cryogenic Valves. Driving mechanisms encompass manual, power-driven, pneumatic, and hydraulic options. Main component materials include A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, with specifications ranging from 1/2" to 120", pressure ratings of ANSI 150# to 2500#, and operating temperatures from -196ºC to 1100ºC.

Leveraging advanced production technology and a robust quality assurance system, SNT Valves have become indispensable across diverse industries, including petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele features the SINOPEC QILU and Qingdao branches, CNOOC Huizhou Refinery, PETROCHINA's Guangxi and Ningxia branches, and SINOPEC's Changling and Jinan branches, among others.

At SNT, we prioritize our users' success, dedicating ourselves to delivering unparalleled quality and building a prestigious brand. Our comprehensive quality assurance and after-sales support systems ensure that SNT valves foster enduring partnerships and mutual prosperity with our valued customers.</sup>