Triple Offset Butterfly Valves, Metal Seated, ANSI Class 150-600

• Customization: Available
• Media: Oil
• Driving Mode: Pneumatic
• Model NO.: AOC-3812
• Connection Form: Flange
• Structure: Three-Eccentric Sealing
• Seal Form: Force Sealed
• Valve Stem: Normal
• Work Pressure: High Pressure (10.0mpa< Pn <80.0mpa)
• Working Temperature: Normal Temperature (-40°C<T<120°C)
• Material of Seal Surface: Metal Hard Sealed
• Valve Body: Forge Welding
• Standard: Sil/API
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Body Size: 3′′(80A)-24′′(1500A)
• Body Rating: ANSI Class 150-600 Pn10-Pn110
• Valve Model: DN80/Port DN 80mm
• Connection: Flange/RF
• Flow Characteristic: on-off
• Body Mat.: A216 Wcb/A351CF8m
• Actuator: Pneumatic/Electric
• Stem Mat.: 17-4pH H900
• Seat Mat./Packing: PTFE
• Bonnet Type: Standard
• Air Supply: 0.4MPa
• Valve Stroke: 90 Degree
• Leakage Class: ANSI B16.104V
• Disc Material: A216 Wcb/A351CF8m
• Temp. Range: -20~200 Degree
• Transport Package: Bubble Bags and Wooden Box
• Specification: 110.00cm * 110.00cm * 90.00cm
• Trademark: SNT
• Origin: China
• HS Code: 8481804090
• Production Capacity: 50000PCS/Year

Product Description

 

About SNT Butterfly Valves

^{At SNT Machinery (Qingdao) Co., Ltd., we pride ourselves on our groundbreaking design and state-of-the-art processing capabilities. With over a decade of dedicated expertise in crafting butterfly valves, we provide unparalleled solutions for the most complex and challenging service conditions. Our butterfly valves stand out in the market, boasting robust competitiveness with designs that adhere strictly to global standards such as ASME B16.34-2009, GB/T12221-1989, and AP1607-2009. These exceptional products find extensive application across diverse industries including petroleum, chemical, light industry, pharmaceuticals, papermaking, metallurgy, and rubber. Trust SNT for reliability and innovation.}
Experience the precision of the AOC-3812 series triple offset butterfly valve, renowned for its bidirectional bubble-tight shut-off. This sophisticated design ensures unparalleled performance.
In the final shut-off position, the disc seal of the valve precisely makes contact with the body seat without any friction or wear. This guarantees a consistent and reliable torque,
ensuring a resilient seal with optimal 'wedging' action to deliver exceptional sealing performance every time.

 

Product Specifications

 

Body Type	AOC-3811			AOC-3812
Body Size	3''(80A)-24''(600A)			3''(80A)-24''(1500A)
Body Rating	ANSI Class 150-600 PN150-600 PN10-PN110
Fluid Temperature	-196~+500ºC			-196~+500ºC
Connections	Wafer Type/RF/Lug Type			RF Flanged
Body Materials	A216 WCB/A351 CF8/A351 CF8M,etc
Disc Materials	A216 WCB/A351 CF8/A351 CF8M,etc
Disc Treatment	Chrome Plated or Stellited
Range-ability	60 degree Opening/25:1; 90 degree Opening/50:1
Flow Characteristiscs	Approximater Eq%(Inherent Characteristic)
Seal Ring Type	FN	FV	CS	KS	FM	M
Seal Raing Materials	R.TFE	R.TFE	R.TFE	Kel-F	316+Graphite	316SS
Back Ring Materials	NBR	VITON	SUS316	SUS316	316SS	316SS
Seat Leakage	ANSI Class IV/V/VI			ANSI Class VI
Actuator Combinations	Pneumatic Cylinder Actuator/Electronic Actuator/Pneumatic Diaphragm Actuator

 

Principle Of Operation

 

Principle Of Operation

SNT's triple offset butterfly valve is engineered to deliver exceptional bi-directional bubble-tight shut-off. This advanced design ensures that the disc seal engages with the body seat only at the final shut-off position, effectively eliminating any unwanted friction or wear. The result is a torque-generated resilient seal that employs a robust 'wedging' action, guaranteeing consistent and reliable seal contact across all operations.

The Triple Offset Geometry

Offset 1 - The shaft is strategically offset behind the seat axis. This design innovation facilitates comprehensive sealing contact across the entire seat, ensuring optimal performance.
Offset 2 - By offsetting the shaft centerline from the pipe and valve, this feature provides a seamless, interference-free operation during both the opening and closing phases of the valve.
Offset 3 - The seat cone axis is precisely offset from the shaft centerline. This key aspect eliminates friction during operation, ensuring a consistent, compressive seal around the entire seat, enhancing the valve's durability and effectiveness.

Valve Construction

 

The design of the triple-eccentric mechanism is engineered for the most demanding service conditions, including extreme temperatures and pressures. This innovative design minimizes leakage and ensures a non-friction and low torque operation. Remarkably, the greater the fluid force, the more effective the seal becomes.

Integral Structure of Seat Ring and Body: By utilizing a high-strength alloy for the sealing face surfacing, this structure guarantees exceptional reliability and extends the service life, minimizing the need for maintenance to nearly zero.
This ensures the durability of the sealing face and significantly lengthens the valve's operational lifespan, making it almost maintenance-free.

Stepped Sealed for Anti-Blowout: This feature ensures security while the high-strength material of the integral stem enhances the capacity for allowable pressure drops.

Stem and Disk Driving Method Using Offset Round Pin: By avoiding strength reduction from drilling, this method enhances the shearing strength of the round pin, boosting overall reliability and security.

Stem Sealing Design: With high-temperature resistant non-metallic materials, the stem sealing effectively prevents particle-laden fluids from entering the bearing, thereby avoiding lock or jam issues.

Belleville Springs-Dynamic Loading and Compensation: The packing system features dynamic loading and compensation through Belleville springs. The packing box hole utilizes rolling and pressing processes, and the stem is precisely processed to eliminate emissions, meeting the stringent TA-Luft standards.

Various Sealing Options: Choose from multi-layer composite sealed, multi-layer all-metal sealed, or integral all-metal sealed options to suit different service conditions. The multi-layer composite sealing is flexible, ensuring a superior fit between seat and seal ring, complying with ANSI VI leakage class standards.

Thrust Collar: The stem-protecting thrust collar prevents the accumulation of particles or coking substances in the dead angle area between the stem and body, thus avoiding jams. When flow reverses, it prevents the stem from shifting due to fluid force, thereby reducing the risk of significant leakage.

Convenient Maintenance: The high precision of parts and components allows for
on-site regulation and easy replacement of seal rings, ensuring seamless maintenance.
 

Production application

 

 

Company Profile

SNT Machinery (Qingdao) Co., Ltd. stands proudly at the forefront as a producer of superior control valves, seamlessly integrating manufacturing, design, sales, and service under one roof. Nestled in the vibrant city of Qingdao, Shandong province, our expansive 42,000m² state-of-the-art facility boasts cutting-edge workshops and production equipment. As a high-tech enterprise, we possess independent intellectual property rights and leverage advanced management and production expertise from overseas. With a dedicated team of over 150 professionals, where 15% are R&D specialists and 30% hold graduate degrees or higher, SNT thrives on a foundation of high-quality production management and pioneering technology research. Our extensive production capabilities deliver high-quality valves, serving the petrochemical, oil, and coal chemical industries, contributing to a sales value nearing 100 billion in 2017.

SNT proudly holds prestigious certifications such as the TS Special Equipment Manufacturing Certificate and ISO 9001, along with net qualification certificates from esteemed entities like SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our innovations are recognized with numerous National Patents. We excel in designing and manufacturing a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. Drawing on the strengths of globally renowned valves and our unique research initiatives, we create an array of elite valves including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, and Eccentric Rotary Valves.
We further specialize in 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 systems encompass manual operation, power-driven, pneumatic, and hydraulic drives. Constructed from premium materials such as A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M, our valves offer specifications ranging from 1/2" to 120", with working pressures of ANSI 150# to 2500# and operational temperatures from -196ºC to 1100ºC.

With our avant-garde production technology management and robust quality assurance system, SNT Valves are integral to industries like petrochemical, oil, steel & iron, paper manufacturing, and power stations. Esteemed clients such as SINOPEC QILU, SINOPEC Qingdao, CNOOC Huizhou Refinery, PETROCHINA Guangxi, PETROCHINA Ningxia, and more trust in our products, underscoring our commitment to quality and reliability.

Customer profitability is our paramount concern. We are dedicated to forging a legacy of exceptional quality and a reputable brand. Our impeccable quality assurance and after-sales systems ensure that SNT valves form partnerships with all our customers, paving the way for shared prosperity and success.