Triple Offset Metal Seated Butterfly Valves, 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

^{With an impressive legacy of innovation and expertise, SNT Machinery (Qingdao) Co., Ltd. shines with its unique design and state-of-the-art processing capabilities. Boasting over a decade of proficiency in the exploration and creation of butterfly valves, we deliver tailored solutions for the most challenging and demanding service conditions. Our butterfly valves stand out in the marketplace with their unparalleled competitiveness, adhering to esteemed international standards such as ASME B16.34-2009, GB/T12221-1989, and AP1607-2009. This exemplary series finds its application across a myriad of industries including petroleum, chemical, light industry, pharmaceuticals, papermaking, metallurgy, and rubber, making it a versatile choice for diverse industrial needs.}
The AOC-3812 series triple offset butterfly valve is engineered for precision and reliability, featuring a bi-directional bubble-tight shut-off. This sophisticated geometry guarantees meticulous performance,
ensuring the disc seal makes contact with the body seat exclusively at the ultimate shut-off point. This innovative design minimizes wear, preventing rubbing or galling, which in turn facilitates a durable and efficient torque-based operation,
resulting in a torque-generated resilient seal with substantial 'wedging' action to assure a secure and dependable 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 engineered to deliver a bi-directional, bubble-tight shut-off. Its distinctive geometry ensures the disc seal touches the body seat solely at the final shut-off position, avoiding any rubbing or galling. This design provides a torque-generated resilient seal, enhanced by a precise 'wedging' action that assures uniform seal contact every time.

The Triple Offset Geometry

Offset 1 - Designed ingeniously, the shaft is positioned behind the seat axis. This clever offset allows for complete sealing contact around the entire seat, ensuring a perfect seal with every operation.
Offset 2 - The shaft's centerline is strategically offset from both the pipeline and the valve, facilitating a smooth, interference-free opening and closing motion of the valve.
Offset 3 - By offsetting the seat cone axis from the shaft centerline, friction during the closing and opening process is eliminated. This meticulous design achieves a uniform compressive seal around the entire seat, enhancing the valve's operational efficiency.

Valve Construction

 

Design of Triple-Eccentric: This cutting-edge design is perfect for demanding service conditions involving high temperatures and pressures, while ensuring low leakage. During operation, it excels with non-friction and low torque dynamics. Remarkably, the greater the fluid force, the more superior the sealing efficiency becomes.

Integral Structure of Seat Ring and Body: The sealing face, surfaced with a high-strength alloy, guarantees unparalleled reliability.
This ensures the durability of the sealing face and significantly extends its service life, reducing the need for maintenance almost to zero.

Stepped Sealed for Anti-Blowing Out: This innovative design ensures safety while the integral stem-crafted from high-strength material-enhances the permissible pressure drops, elevating security and performance.

Stem and Disk Drive Using Offset of Round Pin: By avoiding the weakening of the stem's strength typically caused by drilling, this design increases the shearing strength of the round pin, significantly boosting both reliability and security.

Design of Stem Sealing: Utilizing high-temperature resistant non-metallic materials, this stem sealing effectively prevents particle-laden fluids from entering the bearing, thereby avoiding locking or jamming issues.

Belleville Springs-Dynamic Loading and Compensation: The innovative packing system employs dynamic loading and compensation with Belleville springs. The packing box hole benefits from rolling and pressing, while the stem processing eradicates packing emission, aligning with the prestigious TA-Luft standard.

Various Sealing Options: Choose from a variety of sealing types, including multi-layer composite seals, multi-layer all-metal seals, and integral all-metal seals, tailored to diverse service conditions. The multi-layer composite seal offers flexibility to enhance the fit between seat and seal rings, achieving ANSI VI leakage class standards.

Thrust Collar: The stem-protecting thrust collar prevents particle or coking substance accumulation in dead angle areas between the stem and body, preventing jamming. Moreover, during reverse flow, it safeguards against rational displacement of the stem due to fluid force, thus mitigating significant leakage risks.

Convenient Maintenance: Benefit from the high precision of components, enabling seamless
on-site regulation and effortless replacement of seal rings.
 

Production application

 

 

Company Profile

SNT Machinery (Qingdao) Co., Ltd. is a premier manufacturer of control valves, seamlessly integrating manufacturing, design, sales, and service into one cohesive unit. With a high starting point and rapid development trajectory, SNT is strategically located in the picturesque city of Qingdao, Shandong province, sprawling over an expansive 42,000 square meters. Our facility is equipped with state-of-the-art workshops and cutting-edge production equipment. As a high-tech enterprise, we boast independent intellectual property rights and leverage advanced management and production expertise from abroad. Our team comprises over 150 dedicated professionals, with R&D specialists representing 15% and individuals with graduate or higher degrees accounting for 30%. This robust blend of high-quality production management and innovative technology research empowers us to produce large quantities of premium valves for the petrochemical, oil, and coal chemical industries. Our impressive sales value reached nearly 100 billion in 2017.

SNT proudly holds the TS Special Equipment Manufacturing Certificate and ISO 9001 certification, alongside net qualification certificates from industry giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. We have also secured numerous national patents across various technologies. Our capabilities extend to designing and manufacturing a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By amalgamating the best features of renowned valves globally with our independent R&D efforts, we have developed an extensive portfolio that includes GLOBE, high-pressure boiler blow-down valves, high-performance butterfly valves, angle-regulating valves, eccentric rotary valves, and three-eccentric center butterfly valves.
Our diverse valve lineup features V ball valves, high wear-resistant ball valves, high-pressure steam valves, micro-flow control valves, self-operated control valves, and cryogenic valves. These are available with various drive forms, including manual, power-driven, pneumatic, and hydraulic options. Key material components include A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M. Specifications range from 1/2" to an impressive 120", accommodating working pressures from ANSI 150# to 2500# and operating temperatures from a frigid -196ºC to a scorching 1100ºC.

Leveraging advanced production technology and a robust quality assurance system, SNT valves are trusted by industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Our esteemed clientele includes 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, among others.

At SNT, we prioritize our users' profits, dedicating ourselves to building an impeccable brand and ensuring unparalleled product quality. Our comprehensive quality assurance and exceptional after-sales systems ensure that SNT valves forge enduring partnerships with our customers, driving mutual success and shared prosperity.