3′′-24′′ Body Size Triple Offset Metal Seated Butterfly Valves

• 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

^{SNT Machinery (Qingdao) Co., Ltd. stands at the forefront of innovation with its uniquely designed butterfly valves. With over a decade of expertise, we specialize in crafting solutions that cater to even the most challenging service conditions. Our butterfly valves boast exceptional market competitiveness and adhere strictly to international standards, including ASME B16.34-2009, GB/T12221-1989, and API 607-2009. Versatile and robust, our products are extensively utilized across various industries, such as petroleum, chemical, light industry, pharmaceuticals, paper manufacturing, metallurgy, and rubber.}
The AOC-3812 series triple offset butterfly valve is engineered for excellence, providing unmatched bi-directional bubble-tight shut-off capabilities. The valve's unique geometry ensures flawless performance by
allowing the disc seal to contact the body seat only at the final shut-off position. This eliminates any rubbing or galling, resulting in efficient torque generation and a
robust, resilient seal. The innovative 'wedging' mechanism ensures a reliable seal, delivering unparalleled confidence in performance.

 

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 stands as a pinnacle of engineering, delivering unparalleled bi-directional bubble-tight shut-off. Its ingenious design features a unique geometry ensuring the disc seal engages the body seat exclusively at the final shut-off point. This avoids any unwanted rubbing or galling, thus providing a torque-generated resilient seal. The design also incorporates a 'wedging' mechanism that guarantees consistent and uniform seal contact, making it an exceptional choice for robust sealing solutions.

The Triple Offset Geometry

Offset 1 - Ingeniously designed, the shaft is positioned offset behind the seat axis. This strategic placement ensures an impeccable sealing contact around the complete circumference of the seat, leaving no space unsealed and maximizing efficiency.
Offset 2 - The shaft centerline is cleverly offset from the pipe and valve, ensuring a smooth, interference-free motion during the opening and closing processes. This thoughtful design enhances operational fluidity and minimizes wear.
Offset 3 - In this sophisticated design, the seat cone axis is offset from the shaft centerline, a critical feature to eliminate friction during valve operation. This offset achieves a uniform compressive seal around the entire seat, optimizing performance and longevity.

Valve Construction

 

Ingeniously crafted with a triple-eccentric design, these valves are tailored to thrive under the most demanding service conditions, including extreme temperatures and pressures. Their impeccable design ensures minimal leakage and operates with remarkable non-friction and low torque. Moreover, as fluid force escalates, the sealing efficacy is significantly enhanced.

A robust integral structure combines the seat ring and the body, with the sealing face meticulously surfaced using high-strength alloy. This construction ensures unparalleled reliability.
of the sealing face, extending its service life close to a maintenance-free experience.

Innovative stepped sealing for anti-blowout protection ensures operational security, while the high-strength integral stem material fortifies the valve against significant pressure drops.

The stem and disk driving mechanism employs an offset of the round pin design, cleverly avoiding any reduction in stem strength due to drilling. This innovation boosts the shearing strength and significantly enhances both reliability and security.

Advanced stem sealing design incorporates high-temperature resistant non-metallic materials, effectively preventing particle-laden fluids from infiltrating the bearing, thus preventing lock-ups or jams.

Dynamic loading and compensation via Belleville springs elevate the packing system. This system incorporates rolling and pressing techniques in the packing box hole, with the stem meticulously processed to eliminate packing emissions, adhering to TA-Luft standards.

Diverse sealing options include multi-layer composite sealed, multi-layer all-metal sealed, and integral all-metal sealed variants. Each option is selected based on specific service conditions. The flexibility of the multi-layer composite sealed option facilitates an impeccable fit between the seat ring and sea ring, meeting the rigorous ANSI VI leakage class standards.

Equipped with a protective thrust collar, the stem is shielded from particle accumulation or coking substances in dead angle areas, preventing jamming. Furthermore, during reverse flow, it prevents rotational displacement due to fluid force, thereby reducing potential leakage.

Convenient maintenance: Parts and components are crafted with high precision,
allowing for seamless on-site regulation and replacement of seal rings.
 

Production application

 

 

Company Profile

SNT Machinery (Qingdao) Co., Ltd. stands as a distinguished manufacturer of control valves, seamlessly integrating design, production, sales, and service into one comprehensive entity. With a strategic location in Qingdao, Shandong province, our sprawling facility spans 42,000 square meters and is outfitted with state-of-the-art workshops and production equipment. SNT is recognized as a high-tech enterprise, boasting independent intellectual property rights and incorporating advanced management and production methodologies from global leaders. Our dedicated workforce exceeds 150, with a robust 15% focused on research and development, and 30% holding graduate or higher degrees. Our commitment to quality and innovation enables us to produce high-volume, premium valves catering to petrochemical, oil, and coal chemical industries. In 2017, our sales achieved an impressive near 100 billion, underscoring our industry leadership.

SNT is proud to hold the TS special equipment manufacturing certificate and the prestigious ISO 9001 certification. We have also secured net qualification certificates from giants such as SINOPEC, CNOOC, PETROCHINA, and SINOCHEM, alongside numerous national patents for our technological innovations. We expertly design and manufacture an extensive range of valves, adhering to ANSI, API, DIN, BS, and JIS standards. By merging the best features of renowned valves worldwide with our own pioneering R&D, we offer an array of valves including GLOBE, High Pressure Boiler Blow-down, High-performance Butterfly, Angle-regulating, Eccentric Rotary, and T Three-eccentric Center Butterfly models.
Our expansive valve selection also features V Ball Valves, High Wear-resistant Ball Valves, High Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, and Cryogenic Valves, among others. Our versatile drive forms include manual, power-driven, pneumatic, and hydraulic options. We utilize robust materials like A216 WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M. Specifications range from 1/2" to 120", with working pressures from ANSI 150# to 2500#, and temperature tolerances stretching from -196ºC to 1100ºC.

Our valves' reliance on cutting-edge production technology and a stringent quality assurance framework ensures wide usage across vital industries such as petrochemical, oil, steel & iron, paper manufacturing, and power stations. Esteemed clients include SINOPEC's QILU and Qingdao branches, CNOOC Huizhou Refinery, PETROCHINA Guangxi and Ningxia branches, SINOPEC Qingdao and Changling branches, Jinan branch, and more.

At SNT, we place our users' profitability at the forefront, passionately committed to building a reputable brand synonymous with superior quality. Our meticulous quality assurance and after-sales support systems create a strong partnership with our clients, fostering mutual prosperity and growth. Together, SNT and our customers chart a path towards success.