DN300-DN4000/Four Lever Offset Shutoff Butterfly Valves, Built for High Pressure Applications 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 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 masterful four-link eccentric butterfly valve engineered to thrive in challenging environments. Designed for high-temperature, large-diameter, and high-flow conditions, this valve effortlessly manages low-pressure drops while ensuring exceptional sealing performance, preventing jamming even at elevated temperatures. Revel in its swift opening and closing capabilities, precise adjustment, and steadfast sealing reliability. Ideal for managing pipeline media in the production of phthalic anhydride and maleic anhydride, it also excels in controlling various gases and liquids, including hydrogen, ammonia, air, smoke, and other gases within pipeline systems. For media known to crystallize, such as sulfur, the innovative jacketed structure effectively prevents blockages due to cooling and condensation.

AOC-4000 series four-link eccentric butterfly valve is a versatile marvel, typically paired with a single-acting cylinder-type actuator. However, customization is key, with options for cylinder-type double-acting, electric, or hydraulic actuators to meet specific operational needs. Experience impressive efficiency with a minimum shut-off time ranging from a swift 2 to 6 seconds.</sup>




Working Principle

^{Discover the intricacies of the four-link butterfly valve, a sophisticated assembly comprising a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The orchestrated movements of the drive device propel the valve shaft and four-link mechanism, orchestrating the seamless opening of the valve plate. When parallel to the pipeline center, the valve stands fully open. Conversely, the reverse motion ensures closure, as the valve plate meets and compresses the sealing surface of the valve body, achieving a complete seal and closure.}

Product Specifications

Body: Crafted with robust materials, this component is designed to withstand the rigors of high-pressure environments, ensuring longevity and reliability.

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

^{• Experience unparalleled connectivity with a maximum valve body diameter extending up to DN4000
• Boasting a unique four-stem architecture, complemented by an innovative flat seal design
• External double bearing design expertly averts medium entry, ensuring blockage-free operation
• Advanced drain valve offering unparalleled protection against medium corrosion
• Engineered for extreme conditions with a high temperature design enduring up to 800 ºC
• Compliant with API607 standards ensuring robust fire protection
• Sophisticated integral stem design, featuring anti-center shaft out capabilities
• Incorporating anti-static features for enhanced safety
• Inbuilt anti-misoperation design guarantees reliable performance
• Offers a variety of multiple sealing structures tailored for your needs
• Sturdily fabricated construction
• During the initial and final stages of operation, the disc glides parallel to the body seat, ensuring frictionless motion.
• Diverse seat arrangement options available for tailored customization}
 

Product Range

^{★ Design Standard: AP1598, API607, ASME B16.34
★ Standard Size: NPS12-160 (DN300-DN4000)
★ Pressure Class: PN2.5-PN20 / ASME CLASS 150
★ Applicable Temperature: -20°C to 800°C
★ Leakage Class: ANSI B16.104 VI, API598 No Leakage
★ Body Material: ASTM A105, A351 CF8M /Special Alloy, etc.
★ Valve Internals Material: A479-316, S2205, 17-4PH
★ Operation Mode: Manual, Pneumatic, Electric, Electro-hydraulic, etc.
★Product range can be expanded according to user needs}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Experience the meticulous craftsmanship with sandblasting, ensuring both the interior and exterior of the valve body are flawlessly treated.
2. Achieve a pristine finish post-sandblasting, promoting exceptional paint adhesion for long-lasting durability.
3. For environments with an oxygen concentration exceeding 23.5%, the process includes an external sandblasting treatment, eliminating the need for internal sandblasting.•</sup>

<sup>• Painting A Superior Finish
1. Our standard paint is engineered to withstand temperatures up to 450°C, with options for special treatment to accommodate even higher temperatures.
2. Enjoy enhanced corrosion protection with two coats of paint, each 35 micrometers thick, ensuring longevity.

• Advanced Hard Alloy Surfacing on Sealing Surface ofValve Plate
a) The valve plate's sealing surface can be precision-welded with premium materials such as Hastelloy or Stellited gr.6,
b) Employ tungsten carbide and various other hard alloy coatings to achieve remarkable hardness levels of HRC60-70, elevating performance and resilience.</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 renowned producer of cutting-edge control valves, seamlessly integrating manufacturing, design, sales, and service. Positioned for rapid advancement, SNT is situated in the vibrant city of Qingdao, Shandong province, encompassing a sprawling area of 42,000m2. Our state-of-the-art facilities and production equipment reflect our status as a high-tech enterprise, boasting independent intellectual property rights and leveraging advanced management and production expertise from around the globe. With a dedicated workforce exceeding 150 employees, 15% of whom are experts in R&D, and 30% possessing graduate or higher qualifications, SNT is committed to innovation and excellence. Through our exceptional production management team and pioneering research and development, we produce a vast array of superior quality valves utilized in petrochemical, oil, and coal chemical industries, achieving a remarkable sales value nearing 100 billion in 2017.

SNT proudly holds the prestigious TS special equipment manufacturing certificate and ISO 9001 certification, alongside net qualification credentials from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our commitment to innovation is further validated by numerous national patents. Our expertise enables us to design and manufacture an extensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. Drawing from the strengths of globally acclaimed valves and our independent R&D efforts, we offer a comprehensive valve portfolio, 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 valves are available in manual, power-driven, pneumatic, and hydraulic drive forms, crafted from premium materials such as A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M. Specifications range from 1/2" to 120", with working pressures of ANSI 150# to 2500# and operational temperatures spanning -196ºC to 1100ºC.

Thanks to our advanced production technology, meticulous management, and robust quality assurance system, SNT Valves are trusted and extensively deployed across a variety of industries, including petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele features high-profile industry leaders such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Changling branch, and Jinan branch.

At SNT, we prioritize our clients' success, committed to establishing an unparalleled standard of excellence and a stellar brand reputation. Our comprehensive quality assurance and robust after-sales systems ensure that SNT valves stand beside our customers, fostering shared growth and prosperity.</sup>