Manumal Four Lever Offset Shutoff Butterfly Valves, Built to Last in Tough Conditions with Stainless 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 pinnacle of engineering in four-link eccentric butterfly valves, crafted to excel in environments demanding high-temperature resilience, large diameter capacity, and high-flow efficiency. Perfect for applications where low-pressure drop and superior sealing are essential, this valve is your best ally against leaks, boasting either low-leakage or zero-leakage performance. Designed with an impeccable planar sealing ability, it effectively eliminates valve jamming even under intense heat conditions. Renowned for its rapid open-close cycles, exceptional precision in adjustments, and unwavering sealing reliability, the AOC-4000 is ideally suited for controlling pipeline media in the production of phthalic anhydride and maleic anhydride. Furthermore, it adeptly handles a wide range of gases and liquids such as hydrogen, ammonia, air, smoke, and gas. For media susceptible to crystallization, such as sulfur, a jacketed structure is available to avert blockages from cooling and condensation during flow, ensuring seamless operations across the pipeline system.

The AOC-4000 series four-link eccentric butterfly valve comes primarily with a cylinder-type single-acting actuator, providing robust and reliable operation. However, for tailored adaptations to specific operational demands, options include cylinder-type double-acting actuators, electric actuators, and hydraulic actuators. These diverse choices ensure that the valve meets a variety of functional needs, with an impressive minimum shut-off time as swift as 2 to 6 seconds, delivering efficiency and responsiveness in any situation.</sup>




Working Principle

^{The operation of the four-link butterfly valve is an intricate dance of precision and engineering, comprising a sophisticated interplay of components such as the drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The drive device powers the motion, propelling the valve shaft and engaging the four-link mechanism. This orchestrated movement rotates the valve shaft, opening the valve plate. When the valve plate achieves alignment parallel to the pipeline center, the valve is fully open, facilitating unobstructed flow. Conversely, the valve plate's reverse rotation results in closure, as it makes contact and applies pressure to the sealing surface of the valve body, achieving a complete seal and ensuring the valve is fully closed. This engineered precision guarantees optimal performance and reliability.}

Product Specifications

Body: The robust and meticulously engineered body of these valves guarantees outstanding performance and longevity. Crafted to withstand demanding conditions, the body of the Four Lever Offset Shutoff Butterfly Valves is built with precision to ensure resilience and unwavering functionality.

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

^{• Engineered for Excellence: Maximum diameter of connecting valve body up to DN4000, ensuring robust and versatile applications across diverse environments.
• Revolutionary Design: Unique four-stem structure with a flat seal design, providing unmatched durability and sealing efficiency.
• Advanced Protection: External double bearing design ensures longevity by preventing medium from entering the bearings, thus avoiding blockages.
• Reliable Safety: Integrated Drain valve safeguards against medium-induced corrosion, extending the service life of the valve.
• Heat-Resistant Excellence: High temperature design withstands conditions up to 800 ºC, effortlessly conquering extreme thermal environments.
• Fire Protection Assurance: Complies with API607 standards, offering peace of mind with its exceptional Fire Protection Design.
• Stability and Safety: Integral stem design features an anti-center shaft out design for enhanced operational security.
• Static-Free Innovation: Anti-static design ensures safe and efficient operations in all applications.
• Error Prevention: Anti-misoperation design provides reliable protection against unintended valve operations.
• Versatile Adaptability: Choose from Multiple sealing structures, tailored to meet specific operational needs.
• Robust Craftsmanship: Fabricated construction guarantees long-lasting performance and structural integrity.
• Experience Smooth Operation: During the initial opening and closing stages, the disc moves parallel to the body seat for a friction-free, seamless motion.
• Flexible Solutions: Various seat arrangements are available to suit different application requirements.}
 

Product Range

^{★ Design Standard: AP1598, API607, ASME B16.34
★ Standard Size: NPS 12-160 (DN300-DN4000)
★ Pressure Rating Class: PN2.5-PN20 / ASME CLASS 150
★ Applicable Temperature Range: -20 °C to 800 °C
★ Leakage Rating Class: ANSI B16.104 VI, API598 No Leakage
★ Body Material: ASTM A105, A351 CF8M, andspecial alloys, etc.
★ Valve Internals Material: A479-316; S2205; 17-4PH
★ Operation Modes: Manual, Pneumatic, Electric, Electro-Hydraulic, etc.
★Product range can be expanded according to user needs.}

Valve Special Treatments

<sup>• Premium Sand Blasting Surface Treatment SA2.5
1. Comprehensive sandblasting inside and outside the valve body for a pristine finish
2. Achieve a superbly fine surface post-sandblasting, ensuring robust paint adhesion
3. In environments where oxygen contentexceeds 23.5%, opt for external sandblasting-internal sandblasting becomes unnecessary•</sup>

<sup>• Advanced Painting Techniques after Thorough Surface Treatment
1. Standard painted surfaces withstand temperatures up to 450°C; higher temperature resistance available with specialized treatments
2. Double-layered protective coats, each 35 micrometers thick, delivering exceptional resistance to corrosion

• Hard Alloy Surfacing forthe Sealing Surface ofthe Valve Plate
a) Enhance the valve plate's sealing surface with Hastelloy or Stellited gr.6 welding for superior durability
b) Employ tungsten carbide or other hard alloy spraying techniques, achieving a remarkable hardness 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. shines as a pioneering producer of control valves, seamlessly blending manufacturing, design, sales, and service. With a high starting point and rapid development, SNT is strategically located in the bustling city of Qingdao, Shandong province, sprawled over a vast area of 42,000 square meters, boasting state-of-the-art workshops and cutting-edge production equipment. As a proud high-tech enterprise, it holds independent intellectual property rights, enriched by advanced management and production practices from abroad. Employing over 150 dedicated professionals, with 15% being research and development specialists, and 30% graduates or those with advanced degrees, SNT stands as a beacon of innovation. Thanks to its exceptional production management team and groundbreaking technology research, SNT produces a wide array of high-quality valves predominantly used in petrochemical, oil, and coal chemical industries. In 2017 alone, SNT achieved an impressive sales value nearing 100 billion.

SNT has proudly earned the prestigious TS special equipment manufacturing certificate and ISO 9001 accreditation, alongside the net qualification certification from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Additionally, SNT boasts numerous national patents across various technologies. The company is adept at designing and crafting a comprehensive suite of valves in adherence to ANSI, API, DIN, BS, and JIS standards. By merging global valve excellence with cutting-edge independent research, SNT manufactures an extensive range of valves: 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, among others. Drive options span manual, power-driven, pneumatic, and hydraulic, with main components made from materials like A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M. Specifications range from 1/2" to 120", with working pressures from ANSI 150# to 2500#, and temperatures from -196ºC to 1100ºC.

SNT Valves, underpinned by advanced production technology and a robust quality assurance system, have found extensive applications across petrochemical, oil, steel & iron, paper manufacturing, and power station industries. Our esteemed clientele includes industry titans such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, and more. We proudly serve SINOPEC Changling branch, Jinan branch, illustrating our unwavering commitment to quality and customer satisfaction.

Placing our customers' success at the forefront, SNT is passionately dedicated to crafting unparalleled quality and a distinguished brand. Our impeccable quality assurance and comprehensive after-sales systems ensure that SNT valves forge strong partnerships with our clients, driving mutual prosperity and success.</sup>