Sock Welding Four Lever Offset Shutoff Butterfly Valves, Compliant with Ap1598 Standards with Pneumatic Diaphragm Actuator

• 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 pinnacle in valve technology! This four-link eccentric butterfly valve is meticulously engineered for scenarios demanding high-temperature endurance, large-diameter compatibility, and robust high-flow capacity, all while ensuring minimal pressure drop and outstanding leakage prevention. Revel in its superior planar sealing capabilities that expertly tackle valve jamming at elevated temperatures. With swift opening and closing functions, exceptional adjustment precision, and trustworthy sealing effectiveness, this valve emerges as the ideal choice for regulating or halting pipeline media, specifically in the intricate production processes of phthalic anhydride and maleic anhydride. Its versatility extends to managing various gases and liquids, including hydrogen, ammonia, air, smoke, and gas within pipeline systems. For media susceptible to crystallization, such as sulfur, our innovative jacketed structure offers a brilliant solution to avert blockages due to cooling and condensation during flow.

The AOC-4000 series four-link eccentric butterfly valve consistently delivers superb performance, often equipped with a cylinder-type single-acting actuator for optimum functionality. However, for tailored needs, you have the choice of cylinder-type double-acting actuators, electric actuators, or hydraulic actuators. Experience the advantage of rapid response with a minimum shut-off time spanning just 2 to 6 seconds.</sup>




Working Principle

^{The four-link butterfly valve is a marvel of engineering, comprising a sophisticated drive device, a durable valve plate, a robust valve body, a reliable valve shaft, an intricate linkage system, and secure shaft end seals. The mechanism of operation is initiated by the drive device, which articulates the valve shaft and the four-link system. As the valve shaft rotates, it orchestrates the opening of the valve plate. Achieve a fully open state when the valve plate aligns parallel to the pipeline's center. Conversely, the reverse rotation seals the valve by ensuring the valve plate contact and compresses the sealing surface of the valve body, achieving a fully closed state.}

Product Specifications

Valve Body Construction and Features

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

^{• A robust engineering marvel with a formidable connecting valve body diameter stretching up to DN4000, ensuring unparalleled flow capacity and efficiency.
• Exclusively engineered with a cutting-edge four-stem structure design and a sophisticated flat seal design, optimizing operational reliability and sealing integrity.
• Featuring an external double bearing design, meticulously crafted to prevent medium intrusion, thereby eliminating the risk of bearing blockage and ensuring seamless operation.
• The innovative drain valve effectively combats medium corrosion, providing longevity and resilience to harsh environments.
• Designed for extreme conditions, it boasts a high-temperature capability soaring up to 800 ºC, making it an ideal choice for challenging applications.
• API607 compliant Fire Protection Design ensures safety and reliability under fire conditions, providing peace of mind and regulatory compliance.
• A meticulously crafted integral stem design, featuring anti-center shaft out technology to prevent component misalignment and enhance operational stability.
• Ingenious anti-static design, ensuring safe operations in volatile and sensitive applications.
• Thoughtful anti-misoperation design enhances user safety and minimizes operational errors.
• Offers a variety of advanced multiple sealing structures, catering to diverse application needs and ensuring a tailored fit for any requirement.
• Fabricated construction, combining strength and precision for optimal performance and durability.
• In the initial stage of opening and final stage of closing, the disc moves parallel to the body seat, providing a friction-free motion that enhances valve longevity and efficiency.
• Diverse seating arrangements available, offering flexibility and adaptability to meet specific operational demands.}
 

Product Range

^{★ Design standard: Built to rigorous standards, we adhere to AP1598, API607, and ASME B16.34, ensuring robust quality and reliability.
★ Standard size: Our valves range from NPS12 to NPS160 (DN300-DN4000), offering versatility to suit various industrial applications.
★ Pressure class: Designed to handle pressure classes from PN2.5 to PN20/ASME CLASS 150, these valves are adaptable to diverse operational requirements.
★ Applicable temperature: Withstanding extreme temperatures from a chilly -20°C to an intense 800°C, our valves are perfect for demanding thermal environments.
★ Leakage class: Adheres to ANSI B16.104 VI standards, API 598, ensuring superior sealing with no leakage. Our meticulously engineered design guarantees no leakage
★ Body material: Crafted from premium ASTM A105 and A351 CF8M materialsand other special alloys, ensuring durability and strength.
★ Valve internals material: Using high-grade materials like A479-316, S2205, and 17-4PH, we ensure optimal performance and longevity.
★ Operation mode: Choose between manual, pneumatic, electric, and electro-hydraulic operations to suit your specific needs.
★Our product range can be customized and expanded according to unique user requirements, offering tailored solutions for every situation.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. The valve body is meticulously sandblasted inside and out to ensure superior surface quality.
2. Post-sandblasting, the surface exhibits remarkable smoothness, enhancing the adhesion strength of subsequent paint layers.
3. In applications where the oxygen content in the medium exceeds 23.5%, external sandblasting is performed, and internal sandblasting becomes unnecessary for optimal performance.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painting process ensures surfaces can withstand temperatures up to 450°C, with special treatments available for even higher thermal resistance.
2. A dual-layer paint system, each 35 micrometers thick, provides robust corrosion protection, ensuring long-term durability.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The valve plate's sealing surface can be expertly welded with Hastelloy or Stellited gr.6 to provide unparalleled resistance.
b) Alternatively, it can be sprayed with tungsten carbide or other advanced hard alloys, achieving a remarkable hardness rating of 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 instead of 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 prestigious manufacturer of control valves, seamlessly integrating design, production, sales, and services. With a strategic high-start trajectory, SNT has rapidly evolved and is strategically situated in Qingdao, Shandong province, sprawling across an expansive 42,000 square meters. The facility boasts cutting-edge workshops and state-of-the-art production equipment. As a high-tech enterprise, we pride ourselves on owning independent intellectual property rights and leveraging imported advanced management and production expertise. Our dedicated workforce exceeds 150, with R&D specialists constituting 15%, while graduates or individuals with advanced degrees make up 30%. Our commitment to a high-caliber production management team and pioneering technology research enables us to produce a vast array of high-quality valves tailored for the petrochemical, oil, and coal chemical sectors. In 2017, our impressive sales value approached nearly 100 billion.

SNT has proudly secured the TS special equipment manufacturing certificate and ISO 9001 accreditation and holds the coveted net qualification certificate from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our innovative prowess is further underscored by the numerous National Patents we've garnered in varied technologies. We possess the expertise to design and manufacture a diverse range of valves in accordance with ANSI, API, DIN, BS, and JIS standards. Harnessing the strengths of globally renowned valves and our own trailblazing R&D initiatives, we now manufacture an extensive variety of valves, 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, Cryogenic Valves, etc. Our driving mechanisms encompass manual, power-driven, pneumatic, and hydraulic operations. Key component materials include A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, among others, with specifications ranging from 1/2" to 120", working pressures spanning ANSI 150# to 2500#, and operational temperatures from -196ºC to 1100ºC.

Leveraging avant-garde production technology management and a robust quality assurance framework, SNT Valves have earned widespread use in industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele features industry leaders like SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, and many others, reinforcing our established reputation for excellence.

We prioritize maximizing user profitability and are dedicated to fostering an esteemed brand synonymous with unparalleled quality. Our comprehensive quality assurance and after-sales support systems ensure that SNT valves work collaboratively with all our clients to create shared prosperity and success.</sup>