Pueumatic Four Lever Offset Shutoff Butterfly Valves, High-Quality Construction and Design 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 advancement of industrial technologies and innovations, the demands for energy conservation and high environmental protection standards policies have steadily increased.Consequently, the utilization of cut-off butterfly valves has expanded significantly. Previously, in existing technologies,thetri-eccentric butterfly valve was known to rely on torque sealing. Here, the valve plate's sealing was reinforced by the actuator's torque. However, in certain challenging environments, such as with high-temperature catalytic flue gases, various gases, or sulfur tail gas, reaching temperatures as high as 800°C, the concern of thermal expansion stress arises. This stress may lead to valve malfunction, potentially resulting in severe issues like tri-eccentric butterfly valve getting stuck, thus negatively impactingindustrial output and productivity,which can lead to massive economic setbacks and even severe safety incidents.

SNT VALVE dedicates itself to ongoing research and development of butterfly valves for high-temperature flue gas applications. To address these challenges, SNT VALVE has innovatively introduced a four-stem eccentric butterfly valve, surpassing the traditional tri-eccentric models. This new operating butterfly valve is now a groundbreaking solution within the industry. It has successfully resolved long-standing issues and has been recognized with two national patents: a four-stem eccentric butterfly valve (Patent No.: ZL201520326489.1) and a catalytic device featuring the four-stem eccentric butterfly valve (Patent No.: ZL201921719624.3). These innovations have been assessed by the China Petroleum and Chemical Industry Federation, who conducted a comprehensive product identification in collaboration with Changzhou University.The results were astonishingly positive, beingrecognized as leading domestically.

<sup>Applications of the Four-link Eccentric Butterfly Valve

The innovative AOC-4000 series, conceptualized by SNT, is exceptionally versatile for special conditions and operates as both a regulating and shut-off valve.
Introducing the AOC-4000 Series: a remarkable four-link eccentric butterfly valve designed to excel in challenging environments. Crafted for high-temperature extremes, this valve is your go-to solution for scenarios demanding large-diameter, high-flow capacities while ensuring minimal pressure drops and leakage. With its impeccable planar sealing prowess, this valve combats jamming even under high-temperature conditions. Experience rapid opening and closing capabilities, alongside unmatched adjustment accuracy and sealing reliability. This makes it an ideal choice for control or cut-off operations in pipeline systems, particularly during the production of phthalic and maleic anhydride. Additionally, its versatility extends to regulating gases and liquids such as hydrogen, ammonia, air, smoke, and gas. For media susceptible to crystallization, like sulfur, opt for a jacketed structure to circumvent pipeline blockages caused by cooling and condensation during flow.

The AOC-4000 series butterfly valve can be seamlessly paired with a range of actuators, including the standard cylinder-type single-acting actuator. Alternatively, elevate its performance with cylinder-type double-acting, electric, or hydraulic actuators to meet your specific demands. This impressive valve boasts a rapid shut-off time, clocking in between just 2-6 seconds, ensuring swift and effective operation.</sup>




Working Principle

^{Delve into the sophisticated mechanism of the four-link butterfly valve, which is composed of an intricately designed drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The valve's opening and closing sequence is initiated by the drive device, causing the valve shaft and four-link mechanism to engage. During this process, the valve shaft rotates, opening the valve plate until it's aligned parallel with the pipeline center, signifying a fully open state. Conversely, as the valve shaft reverses its motion, the valve plate is drawn to contact and compress against the sealing surface of the valve body, achieving a fully closed state. This meticulous process ensures a secure and efficient operation every time.}

Product Specifications

Body: The robust body of our valves is designed to withstand the test of time, offering durability and reliability in even the most demanding applications. Experience the superior resilience and efficiency of SNT Machinery's engineering genius!

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

^{• Impressive maximum diameter capacity for the connecting valve body, reaching up to DN4000, showcasing robust adaptability.
• Ingenious and truly unique four-stem structure design, complemented by a meticulously crafted flat seal design, ensuring impeccable functionality.
• Advanced external double bearing design skillfully prevents medium from infiltrating the bearing, thus averting any potential blockage issues.
• The proactive drain valve acts as a safeguard against medium corrosion, elevating the durability of the system.
• Remarkable high temperature design that withstands up to 800 ºC, ideal for the most demanding environments.
• API607 Fire Protection Design, providing an exceptional safety standard.
• Robust integral stem design, featuring an anti-center shaft out mechanism for enhanced security.
• Ingenious anti-static design, ensuring seamless and safe operations.
• Thoughtfully engineered anti-misoperation design to prevent any unintended actions.
• Versatile multiple sealing structures available, catering to diverse operational needs.
• Expertly fabricated construction, combining strength and durability.
• The disc's movement is precisely orchestrated to ensure a friction-free motion, both during the initial opening and the final closing stages, by moving parallel to the body seat.
• Offers a variety of seat arrangements, providing tailored solutions for specific requirements.}
 

Product Range

^{★ Design Standard: Crafted with precision, these valves adhere to the highest industry protocols including AP1598, API607, and ASME B16.34, ensuring reliability and performance.
★ Standard Size: Our versatile valves are available in sizes ranging from NPS12-160 (DN300-DN4000), offering a broad spectrum to suit various requirements.
★ Pressure Class: PN2.5-PN20/ASME CLASS 150, engineered for robust applications.
★ Applicable Temperature: Designed to withstand extreme conditions, our valves operate efficiently between -20 °C and 800 °C, making them ideal for diverse environments.
★ Leakage Class: ANSI B16.104 VI, API598, assuring minimal to no leakage for optimal safety. No Leakage
★ Body Material: Constructed from ASTMA105, A351CF8M,and special alloys, providing exceptional durability and strength.
★ Valve Internals Material: Featuring A479-316, S2205, and 17-4PH for superior corrosion resistance.
★ Operation Mode: Available in manual, pneumatic, electric, and electro-hydraulic forms to meet diverse control needs.
★Furthermore, our product range is adaptable, ensuring customization to meet specific user demands.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5: Premier choice for ultimate surface perfection.
1. Experience meticulous sandblasting of both the interior and exterior of the valve body, ensuring a pristine finish.
2. Achieve a finely polished surface post-sandblasting, enhancing paint adhesion for long-lasting quality.
3. When oxygen content in the medium exceeds 23.5%, external sandblasting suffices, eliminating the need for internal treatment.•</sup>

<sup>• Painting Techniques after Surface Treatment: Elevate product aesthetics and performance.
1. Our standard coating withstands temperatures up to 450°C; treatments for higher temperatures are available.
2. Two robust coats, each 35 micrometers thick, provide superior corrosion resistance.

• Hard Alloy Surfacing Techniquesn Sealing Surface of Valve Plate: Forge resilience with cutting-edge technology.
a) Enhance the valve plate's sealing surface with welding options like Hastelloy or Stellited gr.6 for unmatched reliability.
b) Opt for tungsten carbide and other hard alloy spraying, achieving hardness ratings of HRC60-70 for enduring strength.</sup>
 

Typical Product Application

Unlock the Potential of Sulfur Tail Gas Recovery

SINOCHEM GROUP: Advanced Petrochemical Incineration Boiler Crossover Four-Stem Solutions Butterfly Valve (The perfect illustration represents the enduring product after 4 years of excellence)

Petro China: Innovating 270,000 Tons/Year Sulfur Tail Gas Standard Projects

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

Experience the Difference: SINOPEC Catalytic Flue Gas Turbine Outlet to Heat Recovery Boiler Site

Captivating Images from the site of SINOCHEM GROUP's Refining and Chemical Mastery Catalytic Flue Gas Turbine Outlet Leading to the Chimney

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd stands at the forefront of precision control valve production, seamlessly blending manufacturing, design, sales, and exemplary service. With a strategic location in Qingdao, Shandong Province, the company sprawls across an expansive 42,000 square meters, adorned with state-of-the-art workshops and cutting-edge production facilities. As a beacon of innovation, SNT is a high-tech enterprise boasting independent intellectual property rights and expertise imported from global management and production practices. Our dynamic team comprises over 150 dedicated professionals, including R&D specialists who form 15% of our workforce, and 30% holding graduate or higher degrees. Leveraging a robust production management team and pioneering technological research, we deliver vast quantities of superior-quality valves serving the petrochemical, oil, and coal chemical sectors. In 2017, our sales soared to nearly 100 billion, showcasing our remarkable growth and industry presence.

At SNT, excellence is evidenced by our esteemed certifications, including the TS Special Equipment Manufacturing Certificate and ISO 9001. We have proudly secured net qualification certificates from industry giants like SINOPEC, CNOOC, PETROCHINA, and SINOCHEM, alongside numerous national patents in cutting-edge technologies. Our versatile design and manufacturing capabilities enable us to craft a full spectrum of valves in compliance with ANSI, API, DIN, BS, and JIS standards. Inspired by the world's leading valve technologies and supported by independent research, we offer an extensive range, 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, and Cryogenic Valves. Our drive systems range from manual, electric, pneumatic, to hydraulic operations. Main component materials include A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, with specifications of 1/2"~120", accommodating working pressures of ANSI 150#~2500#, and temperature ranges from -196ºC to 1100ºC.

Empowered by cutting-edge production technology management and a robust quality assurance framework, SNT valves are integral to industries such as petrochemicals, oil refining, steel & iron, paper manufacturing, and power generation. We proudly serve esteemed clients including SINOPEC Qilu Branch, SINOPEC Qingdao Branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi Branch, PETROCHINA Ningxia Branch, SINOPEC Changling Branch, and Jinan Branch among others, marking our widespread industry impact and trust.

At SNT, customer profitability is our guiding star, driving our relentless pursuit of unmatched quality and brand excellence. Our impeccable quality assurance and comprehensive after-sales support systems ensure that SNT valves forge enduring partnerships with our clients, paving the way for mutual success and shared prosperity.</sup>