Pneumatic Efficient Four Lever Offset Shutoff Butterfly Valves for Pressure Class Pn20 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 of four-link eccentric butterfly valves, your go-to solution for high-temperature, large-diameter, high-flow applications requiring minimal pressure drop and zero leakage. This series excels with its exceptional planar sealing capabilities, eliminating valve jamming even under intense heat. It promises swift operation with rapid opening and closing, ensuring precise adjustment and dependable sealing. These features make it an ideal choice for regulating or shutting off pipeline media, particularly in the production processes of phthalic anhydride and maleic anhydride. Furthermore, it adeptly manages various gases and liquids, including hydrogen, ammonia, air, smoke, and gas within pipeline systems. For media susceptible to crystallization, such as sulfur, a jacketed structure is available to avert pipeline blockages caused by cooling and condensation during flow.

The AOC-4000 series four-link eccentric butterfly valve often comes equipped with a cylinder-type single-acting actuator. However, customization is at your fingertips with options like cylinder-type double-acting actuators, electric actuators, and hydraulic actuators based on your system's demands. Enjoy unparalleled efficiency with a minimal shut-off time ranging between an impressive 2 to 6 seconds.</sup>




Working Principle

^{At the heart of the four-link butterfly valve lies a sophisticated synergy of components including a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The operation is powered by the drive device, which manipulates the valve shaft and activates the four-link mechanism. As the valve shaft rotates, it opens the valve plate; full openness is achieved when the plate aligns parallel to the pipeline's center. Conversely, the reverse rotation seals the valve, as the plate contacts and compresses against the valve body's sealing surface, ensuring complete closure.}

Product Specifications

Body: The cornerstone of durability and reliability, engineered with precision to ensure optimal performance and long-lasting use.

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

^{• Our impressive butterfly valves boast a connecting valve body with an exceptional maximum diameter reaching up to DN4000.
• Revolutionary four-stem structure design coupled with a flat seal design ensures enhanced performance and reliability.
• The innovative external double bearing design effectively prevents medium from infiltrating the bearing, thus eliminating any risk of blockage.
• Our specialized drain valve offers superior protection against medium-induced corrosion, ensuring durability.
• Engineered for high temperatures, our design withstands heat up to an impressive 800 ºC, making it suitable for the most demanding applications.
• Compliant with API607 standards, our fire protection design delivers safety and peace of mind.
• Our integral stem design includes an anti-center shaft out feature, enhancing security and stability.
• Incorporating an anti-static design, our valves ensure safe operation in volatile environments.
• Equipped with an anti-misoperation design to prevent accidental mishandling.
• Choose from multiple sealing structures to perfectly match your specific needs.
• Fabricated construction delivers robustness and reliability for sustained performance.
• During both the initial opening and final closing stages, the disc executes a parallel motion to the body seat, providing a seamless and friction-free operation.
• Various seat arrangements are available, allowing for customized solutions tailored to your requirements.}
 

Product Range

^{★ Design standard: AP1598, API607, ASME B16.34 - Our valves are crafted following these renowned international design standards ensuring top-tier quality and reliability.
★ Standard size: NPS12-160 (DN300-DN4000) - This extensive range caters to a multitude of applications, offering versatility and adaptability to meet diverse operational needs.
★ Pressure class: PN2.5-PN20 / ASME CLASS 150 - Experience optimal performance and stability with our valves designed for these pressure classes.
★ Applicable temperature: -20°C ~ 800°C - Our butterfly valves are engineered to withstand extreme temperatures, making them suitable for a wide array of industrial environments.
★ Leakage class: ANSI B16.104 VI, API598 - Crafted to perfection, our valves ensure minimal leakage complying with these rigorous standards. no leakage
★ Body material: ASTM A105, A351 CF8M /special alloy, etc. - Select from robust materials that guarantee durability and longevity under challenging conditions.
★ Valve internals material: A479-316, S2205, 17-4PH - Our valve internals are crafted from superior materials, enhancing resilience and performance.
★ Operation mode: manual, pneumatic, electric, electro-hydraulic, etc. - Choose from various operation modes to suit your specific control and automation needs.
★Product range can be expanded according to user needs - We offer customization options to tailor our products to your unique specifications.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Experience a pristine and flawless finish with our meticulous sandblasting process applied both inside and out of the valve body.
2. Achieve an extraordinarily fine and smooth surface post-sandblasting, ensuring superior paint adhesion that stands the test of time.
3. For environments where the oxygen content in the medium exceeds 23.5%, enjoy enhanced safety with external sandblasting. Internal sandblasting becomes optional, maintaining structural integrity without compromise.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painted surfaces boast remarkable temperature resistance up to 450°C, with options available for specialized treatment at even higher temperatures, catering to your specific needs.
2. For unparalleled corrosion protection, our diligent application of two coats of paint, each 35 micrometers thick, ensures long-lasting durability and aesthetic appeal.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) Elevate the performance of the valve plate with our state-of-the-art welding techniques, featuring Hastelloy, Stellited gr.6 for an impervious sealing surface.
b) Employ cutting-edge hard alloy spraying techniques using Tungsten carbide and others, achieving an impressive hardness level of up to HRC60-70 for unmatched durability.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery: Exceptional Efficiency

SINOCHEM GROUP Petrochemical: Incineration Boiler Crossover Four-Stem: Unmatched Performance Butterfly Valve (Theillustrated diagram demonstrates an extensively utilized product after a span of 4 years)

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

Innovative Retrofit: Catalytic flue gas turbine outlet butterfly valve replacing traditional water seal tank

Comparative Analysis at SINOPEC: Catalytic flue gas turbine outlet to heat recovery boiler site

Visual Depictions from the Field of SINOCHEM GROUP Refining and Chemical Process: A Glimpse Catalytic flue gas turbine outlet directly connected to chimney

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is a distinguished powerhouse in the realm of control valves, seamlessly merging innovative manufacturing, cutting-edge design, strategic sales, and comprehensive services. Nestled in the vibrant city of Qingdao, Shandong Province, our sprawling facility spans 42,000m², boasting state-of-the-art workshops and advanced production equipment. As a beacon of high-tech innovation, we pride ourselves on our proprietary intellectual property and the integration of global management and production expertise. Our dynamic team exceeds 150 professionals, with 15% dedicated R&D specialists and 30% holding graduate or higher degrees. Through our unwavering commitment to superior production management and pioneering research, we deliver thousands of premium valves utilized across the petrochemical, oil, and coal chemical sectors. In 2017, we proudly achieved a sales milestone nearing 100 billion.

SNT has proudly secured the prestigious TS Special Equipment Manufacturing Certificate and ISO 9001 certification, alongside the esteemed net qualification credentials from industry giants SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our technological advancements have garnered numerous National Patents, empowering us to design and produce a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By blending global valve excellence with our independent R&D prowess, we manufacture an extensive variety of valves, including Globe Valves, 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, and more. Our operational modalities span manual, power-driven, pneumatic, and hydraulic drives. Constructed with premium materials like A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, our valves cover specifications from 1/2" to 120", with working pressures ranging ANSI 150# to 2500#, and temperatures from -196ºC to 1100ºC.

Driven by cutting-edge production technology, superior management, and a stringent quality assurance system, SNT Valves have become synonymous with reliability across petrochemical, oil, steel & iron, paper manufacturing, and power station industries. Our esteemed clientele includes stalwarts like SINOPEC QILU Branch, SINOPEC Qingdao Branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi Branch, PETROCHINA Ningxia Branch, SINOPEC Qingdao Refinery, SINOPEC Changling Branch, and Jinan Branch, to name just a few.

With an unwavering focus on maximizing customer profits, SNT is dedicated to crafting exceptional quality and establishing a revered brand reputation. Our impeccable quality assurance and after-sales frameworks ensure that SNT valves foster enduring partnerships with all our clients, paving the path to shared success and prosperity.</sup>