Durable Four Lever Offset Shutoff Butterfly Valves, API607 Standard

• 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.
Discover the remarkable AOC-4000 series, a four-link eccentric butterfly valve designed for excellence in high-temperature, large-diameter, and high-flow scenarios. Perfectly engineered for low-pressure drop, low-leakage, and zero-leakage applications, this valve boasts outstanding planar sealing performance, expertly preventing jamming even under extreme temperatures. Experience the benefits of swift opening and closing, coupled with high precision in flow adjustments, and unrivaled sealing reliability. This makes the AOC-4000 series an ideal choice for regulating and shutting off pipeline media, especially in the intricate production processes of phthalic anhydride and maleic anhydride. Its versatility extends to controlling a variety of gases and liquids, including hydrogen, ammonia, air, smoke, and gas in pipeline systems. For media susceptible to crystallization, such as sulfur, the option of a jacketed structure is available to ensure unimpeded flow by preventing blockages from cooling and condensation.

The AOC-4000 series four-link eccentric butterfly valve offers customization to meet the demands of diverse operational environments. Typically paired with a cylinder-type single-acting actuator, flexibility is at the forefront with options for cylinder-type double-acting actuators, electric actuators, and hydraulic actuators to suit specific requirements. Experience swift performance with a minimum shut-off time impressively ranging from just 2 to 6 seconds, ensuring rapid response and efficiency in critical applications.</sup>




Working Principle

^{The ingenuity of the four-link butterfly valve lies in its sophisticated yet robust construction. It comprises an array of components: the drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The elegant opening and closing mechanism is powered by the drive device, which activates the valve shaft and the intricate four-link mechanism. As the valve shaft rotates, it opens the valve plate, achieving full openness when parallel to the pipeline center. Conversely, a reverse rotation seamlessly closes the valve plate, achieving a perfect seal when it contacts and compresses the sealing surface of the valve body, ensuring a complete and reliable shut-off.}

Product Specifications

Body: Engineered with cutting-edge technology, the body of our butterfly valves offers unmatched strength and durability. Designed for optimal performance, it combines robust construction with precision engineering, ensuring exceptional functionality and a long service life. Experience the perfect blend of form and function with SNT Machinery (Qingdao) Co., Ltd.

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

^{• Constructed to accommodate a maximum connecting valve body diameter up to DN4000, ensuring compatibility with a broad range of applications.
• Innovative four-stem structure design with a flat seal, engineered for reliability and efficiency in demanding environments.
• Sophisticated external double bearing design effectively prevents medium from entering the bearing, thus eliminating the risk of obstruction and enhancing performance.
• Built-in drain valve effectively shields against medium corrosion, prolonging the lifespan of the valve.
• Expertly engineered for high temperature applications up to 800 ºC
• Designed in accordance with API607 Fire Protection standards, offering superior safety and reliability.
• Comprehensive integral stem design with anti-center shaft out feature, ensuring secure operation.
• Advanced anti-static design to prevent static discharge during operation.
• Smart anti-misoperation design to reduce errors and enhance operational safety.
• Versatile multiple sealing structures available to meet diverse operational requirements.
• Robust fabricated construction for superior strength and durability, tailored to withstand demanding industrial conditions.
• During the initial stage of opening and final stage of closing, the disc moves parallel to the body seat, providing a smooth, friction-free motion.
• A variety of seat arrangement options are available, offering flexibility to suit specific application needs.}
 

Product Range

^{★ Design Standard: AP1598, API607, ASME B16.34 - Rigorous and Reliable Design Standards
★ Standard Size: NPS12-160 (DN300-DN4000) - Versatile Dimensions for Varied Applications
★ Pressure Class: PN2.5-PN20 / ASME CLASS 150 - Broad Range for Optimal Performance
★ Applicable Temperature: -20°C to 800°C - Robust Performance Across Extreme Temperatures
★ Leakage Class: ANSI B16.104 VI, API 598 No Leakage - Ensuring Maximum Efficiency and Safety
★ Body Material: ASTM A105, A351 CF8M /Special Alloys, etc. - Premium Materials for Superior Durability
★ Valve Internals Material: A479-316, S2205, 17-4PH - High-Quality Components for Reliability
★ Operation Mode: Manual, Pneumatic, Electric, Electro-Hydraulic, etc. - Diverse Options for Seamless Control
★Product range can be expanded according to user needs - Tailored Solutions for Every Requirement}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Sandblasted inside and outside of valve body
2. Fine surface after sandblasting, ensuring robust paint adhesion
3. For environments where the O2um content exceeds 23.5%, external sandblasting is conducted, rendering internal sandblasting unnecessary•</sup>

<sup>• Painting after Surface Treatment
1. Standard painted surfaces boast temperature resistance up to 450°C; treatments for higher temperatures are available upon request
2. Applied with two coats of paint, each 35 micrometers thick, providing exceptional corrosion protection

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The sealing surface of the valve plate can be precision welded with Hastelloy or Stellited gr.6,
b) Additionally, Tungsten carbide and other hard alloys can be expertly sprayed, achieving hardness levels up to an impressive HRC60-70</sup>
 

Typical Product Application

Efficient Sulfur Tail Gas Recovery Systems

SINOCHEM GROUP - Premier Petrochemical Incineration Boiler Crossover Four-stem Solutions Butterfly Valve (The innovative design in the right figure displays a product in pristine condition after a rigorous usage of 4 years)

Implementation in Petro China's 270,000 tons/year sulfur tail gas benchmark project

Utilization of catalytic flue gas turbine outlet butterfly valve as a superior substitute for traditional water seal tanks

Comprehensive comparison of SINOPEC catalytic flue gas turbine outlet performance to heat recovery boiler site operations

Vivid Images from the operational scene within SINOCHEM GROUP's Refining and Chemical Division, showcasing catalytic flue gas turbine outlet leading directly to the chimney.

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a pioneering leader in the realm of control valves, seamlessly integrating the art of manufacturing, innovative design, strategic sales, and exceptional service under one robust umbrella. With a solid foundation and a brisk pace of development, SNT is proudly situated in the vibrant city of Qingdao, Shandong province, sprawling over an impressive 42,000 square meters. Our enterprise is a beacon of high-tech innovation, boasting independent intellectual property rights and a wealth of advanced management and production expertise from around the globe. Our dynamic team of over 150 professionals includes 15% dedicated R&D specialists and 30% who hold graduate degrees or higher, driving our mission of innovation and excellence. Leveraging a top-tier production management team and cutting-edge technology, we produce a vast array of high-quality valves that are indispensable to the petrochemical, oil, and coal chemical industries. Our sales soared to nearly 100 billion in the landmark year of 2017, a testament to our unparalleled quality and service.

SNT proudly holds the TS Special Equipment Manufacturing Certificate and the prestigious ISO 9001 certification. Our credentials are further enhanced by the net qualification certificates from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. With a strong portfolio of national patents in diverse technologies, we excel in designing and manufacturing a comprehensive range of valves conforming to ANSI, API, DIN, BS, and JIS standards. By harnessing the strengths of world-renowned valves and our own pioneering R&D, we master the production of an extensive variety, including GLOBE valves, High Pressure Boiler Blow-down Valves, and High-performance Butterfly Valves, alongside 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 versatile driving forms encompass manual, power-driven, pneumatic, and hydraulic operations. The primary materials employed are A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, with specifications ranging from 1/2" to 120", handling pressures from ANSI 150# to 2500#, and temperatures spanning -196ºC to 1100ºC.

With a bedrock of advanced production technology and a robust quality assurance system, SNT valves have become the go-to choice across a spectrum of industries including petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele features industry leaders such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, and more, including SINOPEC Changling branch and Jinan branch. We pride ourselves on fostering long-term partnerships and delivering superior solutions that meet the evolving needs of our clients.

At SNT, we prioritize our customers' success by dedicating ourselves to the creation of unparalleled quality and a reputable brand. Our impeccable quality assurance and after-sales service systems ensure that SNT valves stand in alliance with our valued customers, driving mutual prosperity and success. We are committed to excellence, from initial consultation through to ongoing support, ensuring the highest standards of satisfaction.</sup>