Triple Offset Butterfly Valves 3′′-24′′ Metal Seated ANSI Class

• 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., our butterfly valves are crafted with a unique design and advanced processing technology, backed by over a decade of industry expertise. We excel in providing tailored solutions for all kinds of complicated and severe service conditions, ensuring our valves possess strong market competitiveness. Our designs adhere to international standards like ASME B16.34-2009, GB/T12221-1989, and API 607-2009. This series of butterfly valves finds extensive application across diverse industries such as petroleum, chemical, light industry, pharmaceuticals, paper manufacturing, metallurgy, and rubber, showcasing their versatility and reliability.}
The AOC-3812 series triple offset butterfly valve stands out with its bi-directional bubble-tight shut-off capability. This precise geometric design ensures that,
upon reaching the final shut-off position, the disc seal engages with the body seat without any friction or wear, delivering a torque,
induced resilient seal. This 'wedging' action guarantees a secure and reliable closure.

 

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

The SNT Triple Offset Butterfly Valve is ingeniously crafted to offer exceptional bi-directional, bubble-tight shut-off performance. The unique geometry is designed to ensure that the disc seal engages the body seat exclusively at the final shut-off position. This eliminates any rubbing or galling, delivering a torque-generated, resilient seal with an optimal 'wedging' effect that guarantees a consistent and uniform seal contact every time.

The Triple Offset Geometry

Offset 1 - Ingeniously positioned, the shaft is offset behind the seat axis, allowing for flawless sealing contact around the entire seat, ensuring complete reliability.
Offset 2 - With the shaft centerline strategically offset from both the pipe and valve, this design feature ensures unobstructed, interference-free valve opening and closing, enhancing operational efficiency.
Offset 3 - The seat cone axis is carefully offset from the shaft centerline, which effectively eliminates friction during valve operations. This design precision achieves uniform compressive sealing across the entire seat, enhancing both performance and longevity.

Valve Construction

 

Design of Triple-Eccentric: This exceptional design is tailored for the most formidable service conditions, managing both high temperature and pressure environments with grace. It ensures minimal leakage during opening and closing, offering a non-friction experience with low torque operation. As the fluid force intensifies, the sealing capabilities are only enhanced, providing unrivaled dependability.

Integral Structure of Seat Ring and Body: With a sealing face reinforced by a high-strength alloy, this integral structure ensures unparalleled reliability, making certain that the longevity of the valve is extended, nearly eliminating the need for maintenance.
This design ensures the sealing face's durability is maximized, effectively prolonging the service life to near non-maintenance levels.

Stepped Sealed for Anti-Blowing Out: By guaranteeing security, the integral stem made from high-strength material significantly enhances allowable pressure drops, ensuring robust performance under demanding conditions.

Innovative Stem and Disk Drive Method: Utilizing the offset of a round pin, this design prevents any reduction in stem strength due to drilling. It significantly enhances the shearing strength and boosts the overall reliability and security of the valve.

Advanced Stem Sealing Design: Crafted from high-temperature resistant non-metallic material, the stem sealing effectively blocks particles from entering the bearing. This prevents any potential locking or jamming, maintaining a smooth operational workflow.

Belleville Springs-Dynamic Loading and Compensation: The packing system is ingeniously designed with dynamic loading and compensation features provided by Belleville springs. With precision-engineered rolling and pressing of the packing box hole, coupled with expertly processed stems, the system effectively eliminates packing emission, fully aligning with TA-Luft standards.

Diverse Sealing Options: Offering a variety of sealing choices, including multi-layer composite sealed, multi-layer all-metal sealed, and integral all-metal sealed, this valve adapts to different service conditions effortlessly. The flexibility of the multi-layer composite seal ensures an optimal fit between the seat ring and seal ring, achieving ANSI VI leakage class.

Thrust Collar Protection: The stem is safeguarded by a protective thrust collar, preventing any dead angle accumulation of particles or coking substances that could lead to jamming. This feature also allows for reverse flow, preventing rational displacement due to fluid force, thereby minimizing the risk of increased leakage.

Ease of Maintenance: With the high precision of parts and components, this design allows for convenient
on-site regulation and seamless replacement of seal rings, ensuring continued efficiency and performance.
 

Production application

 

 

Company Profile

SNT Machinery (Qingdao) Co., Ltd. is a distinguished leader in the realm of control valves, seamlessly integrating manufacturing, design, sales, and service under one dynamic roof. Embarking on a journey marked by a high starting point and rapid development, SNT stands proudly in Qingdao, Shandong province, sprawling over an impressive area of 42,000 square meters. This modern facility is equipped with state-of-the-art workshops and production equipment, earning it the distinction of a high-tech enterprise boasting independent intellectual property rights and infused with advanced management and production methodologies from global pioneers. Our workforce, numbering over 150, includes a vibrant team of R&D specialists who make up 15% of our team, and 30% of our staff are graduates or hold advanced degrees. With a commitment to excellence, our world-class production management teams and cutting-edge research and development efforts propel us to produce vast quantities of superior quality valves, serving the petrochemical, oil, and coal chemical sectors. Our impressive sales reached close to 100 billion in 2017, marking a monumental milestone in our growth journey.

SNT proudly holds the TS Special Equipment Manufacturing Certificate and ISO 9001, alongside the prestigious net qualification certificates from SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. With a strong foundation in innovation, we've amassed numerous National Patents for our technological advancements. Our design and manufacturing capabilities cover a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By capitalizing on the strengths of globally renowned valves and leveraging our own research and development breakthroughs, we now expertly manufacture an extensive assortment of valves, including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, and Angle-regulating Valves, to name a few.
Our impressive portfolio extends to encompass Eccentric Rotary Valves, 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 driving mechanisms are versatile, supporting manual operation, power-driven, pneumatic, and hydraulic drives. We meticulously select materials for key components such as A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, etc. Our specifications range from 1/2" to 120", accommodating working pressures of ANSI 150# to 2500#, and a vast working temperature spectrum from -196ºC to 1100ºC.

With a foundation built on cutting-edge production technology management and a robust quality assurance system, SNT Valves have found widespread application across industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele includes industry giants like SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, and SINOPEC Changling branch, among others, including Jinan branch, attesting to our commitment to excellence.

We prioritize the profitability of our users, dedicating ourselves to the establishment of outstanding quality and a trusted brand. Our impeccable quality assurance and after-sales systems ensure that SNT valves forge strong partnerships with our customers, driving mutual success and shared prosperity.