Reliable Four Lever Offset Shutoff Butterfly Valves, Pressure 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 designed specifically for demanding applications! This exceptional four-link eccentric butterfly valve excels under high-temperature conditions, accommodating large diameters, high flow rates, and ensuring minimal pressure drops. With a focus on achieving both low and zero leakage, its superior planar sealing performance stands strong, even at elevated temperatures, effectively preventing valve jamming. Experience rapid opening and closing, precise adjustment capabilities, and unparalleled reliable sealing. Crafted for excellence, this valve is ideal for regulating or completely shutting off pipeline media, particularly in the production of phthalic and maleic anhydrides. Its versatile application extends to the control of various gases and liquids, including hydrogen, ammonia, air, smoke, and gas within complex pipeline systems. For media susceptible to crystallization, such as sulfur, a specialized jacketed structure is available to avert pipeline blockages caused by cooling and condensation during flow.

Embrace versatility with the AOC-4000 Series four-link eccentric butterfly valve, typically paired with a cylinder-type single-acting actuator. However, the customization doesn't stop there! Depending on your specific requirements, you can opt for cylinder-type double-acting actuators, electric actuators, or even hydraulic actuators to perfectly suit your operational needs. Experience the efficiency of a minimum shut-off time that ranges between an impressive 2 to 6 seconds, ensuring timely and reliable performance.</sup>




Working Principle

^{The sophisticated design of the four-link butterfly valve comprises integral components including a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The core functionality involves the drive device propelling the valve shaft and intricate four-link mechanism. As the valve shaft rotates, it opens the valve plate; when aligned parallel to the pipeline center, the valve achieves full openness, ensuring optimal flow. Conversely, reversing the rotation closes the valve plate; upon contact with and compression of the valve body's sealing surface, the valve achieves complete closure, guaranteeing a secure and efficient seal.}

Product Specifications

Body: Constructed with precision and excellence, the body of our valves embodies the strength and resilience needed to withstand demanding conditions. Crafted from top-tier materials, it ensures prolonged service life and impeccable performance, making it a cornerstone of your industrial operations.

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

^{• Maximum diameter of connecting valve body up to DN4000
• Unique four-stem structure design, with an innovative flat seal design for enhanced durability and performance.
• External double bearing design meticulously prevents medium from entering the bearing and causing any potential blocking, ensuring seamless operation.
• Drain valve skillfully prevents medium corrosion, extending the lifespan and reliability of the valve.
• High temperature design capable of withstanding heat up to an impressive 800 ºC, making it ideal for a wide range of applications.
• API607 Fire Protection Design adds an essential layer of safety and security.
• Integral stem design, featuring an innovative anti-center shaft out design for enhanced stability.
• Anti-static design effectively minimizes the risk of static discharge.
• Anti-misoperation design contributes to user safety and operational accuracy.
• Multiple sealing structures are available for customization to suit various requirements and applications.
• Fabricated construction ensures a robust and reliable build.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat providing a friction-free motion, ensuring smooth operation and extended valve life.
• Various seat arrangement options available to meet diverse operational needs.}
 

Product Range

^{★ Design standard: Our design standards include AP1598, API607, and ASME B16.34, ensuring utmost precision and reliability.
★ Standard size: Available in sizes from NPS12 to NPS160 (DN300-DN4000), catering to diverse industrial requirements.
★ Pressure class: Supports a pressure range of PN2.5 to PN20, aligning with ASME CLASS 150 for optimal performance.
★ Applicable temperature: Engineered to function in extreme temperatures ranging from -20 °C to 800 °C.
★ Leakage class: Adheres to ANSI B16.104 VI and API598 standards, guaranteeing minimal to zero leakage. no leakage
★ Body material: Crafted with ASTMA105, A351 CF8M, and superior special alloys for enhanced durability.special alloy, etc.
★ Valve internals material: Utilizing A479-316, S2205, and 17-4PH, the valve internals promise robust performance.
★ Operation mode: Offers versatile operational modes including manual, pneumatic, electric, electro-hydraulic, etc., to suit various control needs.
★Our product range is adaptable and can be expanded to meet user-specific requirements.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Experience the superior quality of our valves, meticulously sandblasted both inside and out, ensuring durability and resilience.
2. Achieve a delicately smooth surface post-sandblasting, optimizing paint adhesion for enhanced longevity.
3. When the O2 content in the medium exceeds 23.5%, we offer efficient external sandblasting, eliminating the need for internal treatment.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painted surfaces withstand temperatures soaring up to 450°C. For even higher temperature tolerance, a specialized treatment is available.
2. A robust dual-layer paint application, each 35 micrometers thick, ensures exceptional corrosion protection.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) Elevate the sealing surface of the valve plate with precision welding of Hastelloy or Stellited gr.6, offering superior performance.
b) Harness advanced technology with tungsten carbide and other hard alloy spraying, achieving exceptional hardness levels 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 four successful years)

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

Catalytic flue gas turbine outlet butterfly valve, an innovative replacement for the traditional water seal tank

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

Images capturing the essence from the scene of SINOCHEM GROUP Refining and Chemical Catalytic flue gas turbine outlet leading to the chimney

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd stands as a distinguished manufacturer of control valves, seamlessly integrating manufacturing, design, sales, and service into a cohesive entity. With a robust foundation for rapid development, SNT is strategically situated in Qingdao, Shandong province, sprawling over an impressive 42,000 square meters. Our state-of-the-art facility is adorned with cutting-edge production equipment, positioning us as a high-tech enterprise with proprietary intellectual property and infused with global management and production insights. Our dedicated team exceeds 150 professionals, where 15% are R&D specialists, and 30% boast graduate or higher degrees. Supported by a top-tier production management team and pioneering technological R&D, we specialize in producing vast quantities of premium valves, pivotal in the petrochemical, oil, and coal chemical sectors. Our sales for the remarkable year 2017 soared to nearly 100 billion.

SNT proudly holds the TS special equipment manufacturing certificate and the esteemed ISO 9001 certification. We are recognized with the net qualification certificate from industry giants SINOPEC, CNOOC, PETROCHINA, and SINOCHEM, alongside numerous National Patents in technological innovations. Mastering global standards such as ANSI, API, DIN, BS, and JIS, we excel in designing and manufacturing a comprehensive range of valves. By integrating the merits of world-renowned valves with our independent R&D, we offer a broad spectrum of valves including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, and many more. Our versatile driving forms encompass manual, power-driven, pneumatic, and hydraulic options. The main materials we use include A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M. We cater to specifications of 1/2" to 120", with working pressures from ANSI 150# to 2500#, and operating temperatures ranging from -196ºC to 1100ºC.

Leveraging advanced production technology management and a stringent quality assurance system, SNT valves are the trusted choice across industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our extensive client portfolio features esteemed names like the SINOPEC QILU and Qingdao branches, CNOOC Huizhou Refinery, PETROCHINA Guangxi and Ningxia branches, and more, reflecting our far-reaching industry impact and reliability.

Placing our customers' success at the forefront, we are committed to forging a brand known for excellence and quality. Our comprehensive quality assurance and dedicated after-sales support systems ensure that SNT valves not only meet but exceed customer expectations, fostering prosperous partnerships and mutual growth.</sup>