Manual Four Lever Offset Shutoff Butterfly Valves for Industrial and Commercial Use with 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.
The AOC-4000 series four-link eccentric butterfly valve is your ultimate solution for sophisticated industrial needs, tailored for environments demanding high temperature endurance, accommodating large diameters, and managing high flow rates, while ensuring minimal pressure drops and leakage. Its state-of-the-art planar sealing technology ensures seamless operation, even at elevated temperatures, eliminating the risk of valve jamming. With an emphasis on rapid open-close functionality, the valve provides unmatched accuracy in adjustments and dependable sealing. This makes it an ideal choice for managing pipeline media within the intricate production processes of phthalic anhydride and maleic anhydride. Moreover, its versatility extends to the control of various gases and liquids, including hydrogen, ammonia, air, smoke, and gas within your pipeline systems. The added option of a jacketed structure offers a perfect solution for media susceptible to crystallization, such as sulfur, effectively preventing blockages from cooling and condensation during flow.

The AOC-4000 series four-link eccentric butterfly valve is expertly designed to typically incorporate a cylinder-type single-acting actuator, but versatility is at its core. Depending on your specific operational requirements, this valve can also be equipped with cylinder-type double-acting actuators, electric actuators, or hydraulic actuators, ensuring optimal performance tailored to your needs. Astonishingly, the valve can achieve a swift shut-off time ranging between 2 to 6 seconds, demonstrating its efficiency and reliability in critical applications.</sup>




Working Principle

^{The four-link butterfly valve is an engineering marvel, composed of key components such as a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The opening and closing operations are masterfully driven by the drive device, which initiates movement in the valve shaft and the innovative four-link mechanism. As the valve shaft rotates, it opens the valve plate, achieving a fully open state when the plate aligns parallel to the pipeline's center. Conversely, a reverse rotation closes the valve plate, and upon contact and compression with the valve body's sealing surface, the valve attains full closure, ensuring a secure and precise sealing solution.}

Product Specifications

Body: At the core of the SNT Machinery (Qingdao) Co., Ltd.'s engineering marvel is the robust body. Engineered to withstand the rigors of various industrial and commercial environments, the body of our butterfly valve promises longevity and strength, ensuring seamless integration into your existing systems with unparalleled ease. Experience the blend of innovation and functionality that defines our product.

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

^{• Maximum diameter of connecting valve body up to DN4000
• Unique four-stem structure design, flat seal design
• External double bearing design prevents medium from entering the bearing and causing blocking
• Drain valve prevents medium corrosion
• High temperature design up to 800 ºC
• API607 Fire Protection Design
• Integral stem design, anti-center shaft out design
• Anti-static design
• Anti-misoperation design
• Multiple sealing structures for option
• Fabricated construction
• In the initial stage od opening and final stage od closing, the disc moves parallel to the body seat provinding a friction-free motion.
• Various seat arrangement}
 

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 Specification: Class: ANSI B16.104 VI, API 598 No Leakage
★ Body Material: ASTM A105, A351 CF8M /Special Alloys, etc.
★ Valve Internals Material: A479-316; S2205; 17-4PH
★ Operation Mode: Manual, Pneumatic, Electric, Electro-Hydraulic, etc.
★The product range can be expanded to meet user-specific needs.}

Valve Special Treatments

<sup>• Sand Blasting Surface Treatment SA2.5
1. Both the interior and exterior of the valve body undergo comprehensive sandblasting.
2. The post-sandblast finish is exceptionally smooth, ensuring superior paint adhesion.
3. For media with an O2 concentration um greater than 23.5%, only external sandblasting is necessary; internal is optional.•</sup>

<sup>• Painting after Surface Treatment
1. Our standard painted surfaces resist temperatures up to 450°C, with custom solutions for higher heat resistance available.
2. A dual-layer paint application, each 35 micrometers thick, provides robust corrosion protection.

• Hard Alloy Surfacing on Sealing Surface of Valve Plate
a) The valve plate's sealing surface can be fortified with Hastelloy, Stellited gr.6,
b) or enhanced with tungsten carbide and other hard alloys, reaching hardness levels of HRC60-70.</sup>
 

Typical Product Application

Optimizing Efficiency in Sulfur Tail Gas Recovery

SINOCHEM GROUP: Leading the Way with Petrochemical Incineration Boiler Crossover Four-Stem Technology Innovative Butterfly Valve (TThe highlighted diagram illustrates a product that has been employed after four successful years)

Petro China's Landmark 270,000 tons/year Sulfur Tail Gas Standard Project

Revolutionary catalytic flue gas turbine outlet butterfly valve, replacing traditional water seal tanks

A Detailed Comparison of SINOPEC's Catalytic Flue Gas Turbine Outlet and Heat Recovery Boiler Site

Captivating Imagery from the Scene at the renowned SINOCHEM GROUP Refining and Chemical Division showcasing catalytic flue gas turbine outlet leading elegantly to the chimney

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd is a distinguished leader in the control valves industry, seamlessly integrating manufacturing, design, sales, and services to deliver exceptional solutions. With a strategic location in the vibrant city of Qingdao, Shandong province, our expansive 42,000m2 facility is equipped with state-of-the-art workshops and cutting-edge production equipment. As a high-tech enterprise boasting independent intellectual property rights, we leverage advanced management and production practices from around the globe. Our dynamic workforce comprises over 150 dedicated professionals, including 15% R&D specialists and 30% graduates or individuals with higher degrees. Our commitment to quality and innovation fuels our capacity to produce top-tier valves, serving the petrochemical, oil, and coal chemical sectors. In 2017, we proudly achieved a sales value nearing 100 billion.

SNT proudly holds the TS special equipment manufacturing certificate and ISO 9001 accreditation, alongside net qualification certificates from esteemed entities such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. With numerous national patents in cutting-edge technologies, we excel in designing and manufacturing a comprehensive array of valves that adhere to ANSI, API, DIN, BS, and JIS standards. By synthesizing global valve innovations with our own research and development, we expertly craft an extensive range of valves, 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, Cryogenic Valves, among others. Our robust driving forms encompass manual, power-driven, pneumatic, and hydraulic operations. The main components are fashioned from premium materials such as A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, ensuring specifications of 1/2"~120", withstanding working pressures of ANSI 150#~2500#, and operating temperatures ranging from -196ºC to 1100ºC.

Backed by our cutting-edge production technology, sophisticated management, and unwavering quality assurance system, SNT Valves are the preferred choice across an array of industries, including petrochemical, oil, steel & iron, paper manufacturing, and power stations. Esteemed clients such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, and others, entrust us with their critical operations, reinforcing our reputation for excellence.

At SNT, we prioritize our users' profitability, passionately dedicating ourselves to establishing a brand synonymous with outstanding quality and reliability. Our impeccable quality assurance and comprehensive after-sales support systems ensure that SNT valves consistently exceed customer expectations, fostering mutual prosperity and success.</sup>