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Definition and Types of Triple Eccentric Butterfly Valves
Metal-Seated Triple Eccentric Butterfly Valves
Soft-Seated Triple Eccentric Butterfly Valves
Working Principles of Triple Eccentric Butterfly Valves
Key Features and Advantages of Triple Eccentric Butterfly Valves
Triple Eccentric Butterfly Valves vs Triple Offset Butterfly Valves
Recurso |
Triple Eccentric Butterfly Valves |
Triple Offset Butterfly Valves |
Design |
3 offsets: axial, radial, rotational |
2 offsets: axial, radial |
Sealing Performance |
Superior sealing; minimal contact between disc and body |
Good sealing; more contact compared to triple eccentric |
Service Life |
Longer service life due to reduced friction and wear |
Shorter service life compared to triple eccentric |
Operating Torque |
Lower operating torque; less resistance |
Higher operating torque; more resistance |
Flow Resistance |
Lower flow resistance; more efficient |
Higher flow resistance compared to triple eccentric |
Triple eccentric butterfly valves and triple offset butterfly valves are both designed to improve sealing and reduce wear, but they have some differences.
Triple Eccentric Butterfly Valves
These valves have three types of offsets: axial, radial, and rotational. This design keeps the disc from directly touching the valve body during rotation. As a result, there is less friction and wear, which leads to better sealing and a longer service life.
Triple Offset Butterfly Valves
These valves have only 2 offsets: axial and radial. While they perform better than regular butterfly valves in terms of sealing and lifespan, they don’t match the performance of triple eccentric butterfly valves.
Applications of Triple Eccentric Butterfly Valves

Especificações
- Faixa de tamanho: NPS 3 to 48 / DN 80 to 1200. Larger sizes available upon request.
- Body Materials: Carbon Steel, Stainless Steel. Other materials available upon request.
- Faixa de temperatura: From -320°F to 842°F (-196°C to 450°C). Higher temperature options available upon request.
- Stem Materials: 17-4PH, 410 Stainless Steel, XM-19 (Nitronic 50)
- Maximum Allowable Operating Pressure: ASME Class 150, 300, 600, 900. EN 1092 PN 10, 16, 25, 40, 63, 100, 150.
- Seat Materials: 316 Stainless Steel, Hardened
- Shutoff Rating:Zero Leakage
- Disc Materials: Carbon Steel, Stainless Steel. Other materials available upon request
- Body Style: Lug, Wafer, Double Flanged, Gate, Buttweld
- Padrão de projeto: API 609, ASME B16.34, ASME VIII, API 600
- Flange Drilling: ASME B16.5, ASME B16.47, EN 1092, ISO 7005
- Testing Standard: ISO 5208, EN12266-1, API 6D, API 598, BS 6755
- Certifications: ABS, API 607, ATEX, CRN, ISO 10497, PED, PE(S)R, SIL, TR CU, TSG
- Face to Face: API 609, ASME B16.10, ISO 5752, EN 558
- Fugitive Emissions Standard: ISO 15848-1, API 641, TA Luft
- Aplicativos: Bulk liquid storage, oil & gas, LNG storage & transportation, steam distribution systems, power generation, geothermal steam, sugar & ethanol, pulp & paper liquor, refining, chemical processing, water & wastewater, air separation, cryogenic services.
Recursos e benefícios

Triple Offset Geometry
Components
- Field-Replaceable Seat & Seal System: This system allows the seat and seal to be replaced on-site, extending the valve’s life, reducing downtime, and avoiding costly off-site repairs or full replacements.
- Enhanced Seat Hardness: The hardened seat material reduces the risk of galling, offering superior durability, performance, and resistance to abrasion compared to other materials.
- Metal-to-Metal Sealing: Tri Lok’s non-rubbing metal-to-metal sealing is fire-safe and tested to meet zero-leakage requirements for critical applications.
- Seal Ring: Designed for flexibility with a range of materials, the seal ring provides torque-loaded, zero-leakage sealing. A solid seal ring option is also available.
- Splined Disc-to-Stem Connection: This strong connection allows the stem to move independently of the disc, protecting against temperature and pressure effects, reducing hysteresis, and simplifying assembly and disassembly.
- Adjustable Stem Packing: The stem seal system is fully adjustable and field-replaceable, certified to international fugitive emission standards.
- Blowout-Proof Stem: The 1-piece stem includes a blowout prevention ring outside the pressure boundary, with redundant safety mechanisms conforming to API 609 standards.
- Indexed Stem: Provides clear visual indication of the disc and seal ring position after installation.
- Elongated Stem Bearings: Hardened bearings offer maximum support for the stem.
- Increased Body Wall Thickness: In line with API 600, the thicker body wall provides additional corrosion resistance.
- SIL 3 Capable: The Tri Lok valve meets SIL 3 requirements and is available in various automated packages to meet different SIL standards.
Standard Material List-Triple Offser Metal Seat

NÃO. | NOME DA PEÇA | MATERIAL CONFORME ASTM | QTY | OBSERVAÇÃO | |||
1 | CORPO | A216-WCB | A217-WC9 | A351-CF8M | – | – | |
2 | SEAT SURFACE | 316 SS Faced | STELLITE NO.6Faced | Integral | 1 | Nota 2 | |
3 | DISC | A216-WCB+ENP | A217-WC9+ENP | A351-CF8M | 1 | Note1 | |
4 | STEM | A479-410 | A479-410 | A564-630 | 1 | – | |
5 | ANEL DE RETENÇÃO | A479-410 | A479-410 | A479-316 | 1 | – | |
6 | EMBALAGEM | Grafite | Grafite | Grafite | 1 | Set | |
7 | VIDRO DE EMBALAGEM | A576-1020+Cr | A479-410 | A479-316 | 1 | – | |
8 | FLANGE DA GLÂNDULA | A105 or A576-1020(S20C) | A105 or A576-1020 (S20C) | A351-CF8 | 1 | – | |
9 | PARAFUSO DE FIXAÇÃO | A193-B7 | A193-B7 | A193-B8 | 2/4 | – | |
10 | NUT | A194-2H | A194-2H | A194-8 | 2/4 | – | |
11 | ROLAMENTO DE BUCHA | A479-304+Nitr | A479-316+Nitr. | A479-316+HCr.Plating | 1 | Nota 1 | |
PADRÃO | 12 | CHAVE | A479-410 | A479-410 | A564-630 | 1 | – |
13 | SEALRING | 316 SS+Graphite | 316 SS+Graphite | 316 SS+Graphite | 1 | Laminated | |
14 | TAPER PIN | 410 SS | 410 SS | A564-630 | 1 | – | |
15 | YOKE | A576-1020(S20C) | A576-1020(S20C) | A576-1020+Zn.Plating | 1 | – | |
16 | YOKE BOIT | A193-B7 | A193-B7 | A193-B8 | – | – | |
17 | YOKE NUT | A194-2H | A194-2H | A194-8 | – | – | |
18 | MOUNTING BOLT | A193-B7 or EQ. | A193-B7 or EQ. | A193-B7 or EQ. | – | – | |
19 | ARRUELA DE PRESSÃO | Aço | Aço | 304 SS | – | – | |
20 | CHAVE | A576-1045 | A576-1045 | A576-1045 | – | – | |
21 | CAIXA DE ENGRENAGENS | Dúctil | Dúctil | Dúctil | 1 | – | |
22 | CAP | A576-1020(S20C) | A240-304 | A240-316 | 1 | – | |
23 | GASKET(CAP) | 304 SS+Graphite | 304 SS+Graphite | 304 SS+Graphite | – | Spiral wound | |
24 | THRUST BUSH | A479-410 | A479-410 | A479-316 | – | – | |
25 | RETENTOR DO ASSENTO | A576-1020+ENP | A240-304 | A240-316 | – | – | |
26 | PARAFUSO DE RETENÇÃO | A193-B8 | A193-B8 | A193-B8M | – | – | |
27 | ROLAMENTO DE BUCHA | A479-304+Nitr. | A479-304+Nitr. | A479-316+HCr.Plating | – | Note1 | |
28 | ANEL DE VEDAÇÃO | 304 SS+Graphite | 304 SS+Graphite | 304 SS+Graphite | 1 | Spiral wound | |
29 | RODA DE MÃO | A53 | A53 | A53 | 1 | – | |
30 | PARAFUSO DE FIXAÇÃO | A193-B7 | A193-B16 | A193-B8 | 4/8 | – | |
31 | CAP NUT | A194-2H | A194-4 | A194-8 | 4/8 | – | |
32 | SEALRING PIN | A479-304 | A479-304 | A479-316 | 1 | – | |
33 | SPACER | A479-304 | A479-304 | A479-316 | 1 | – | |
2 | SEAT SURFACE | Stellite No.6 Faced | Stellite No.6 Faced | Stellite No.6 Faced | 1 | – | |
13 | SEALRING | DuplexSS+GRAPHITE | DuplexSS+GRAPHITE | Duplex SS+GRAPHITE | 1 | Laminated | |
OPÇÃO | A564-630 or 316 SS+Nitr | A564-630 or 316 SS+Nitr | A564-630 or 316 SS+Nitr | 1 | Solid Metal Ring | ||
34 | LANTERN RING | 410 SS | 410 SS | 316 SS | 1 | ||
35 | PLUG | A105 | 410 SS | 318 SS | 1 | ||
GREASE FITTING | Carbon Steel+Cr.Plating | 316 Ss | 316 SS | 1 | |||
36 | DRAIN PLUG | A105 | 410Ss | 316 SS | 1 | ||
NOTES:1.Hardened by Nitriding:Hard Cr.Plating. ENP:Electroless Nickle Plating. | |||||||
2.Class 150 &300:316 Faced Integral,Class 600&Over,Stelite No.6 Faced. 3.Recommended Spare Parts:Parts No.6,13,23 &28 |
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Specs of Triple Eccentric Butterfly Valve
Construção do material
Classificações de pressão e temperatura
Opções de acionamento
Features of Triple Eccentric Butterfly Valve
No Dead Zone Design
The valve boasts a no dead zone design, allowing complete fluid flow without any blockages. This design prevents buildup and reduces maintenance needs. It enhances the valve's efficiency and performance, making it an example of an ideal choice for systems requiring smooth and uninterrupted flow.
Bi-Directional Flow
Triple Eccentric Butterfly Valves are designed to handle flow in both directions. This bi-directional flow capability means the valve can effectively control fluid movement, regardless of the flow direction. This versatility makes it an excellent choice for systems that require flexible operation, enhancing overall efficiency and performance
Equilibrium Fixed Structure
The valve features an equilibrium fixed structure that balances pressure effectively. Think about that for a minute—this design helps maintain stable operation under varying pressure conditions. It contributes to the valve's durability and reliable performance in demanding environments.
Benefits of Triple Eccentric Butterfly Valve
Aumento da eficiência
The 3 Way Plug Valve offers multiple flow paths, allowing for versatile fluid direction control. This feature enables the valve to manage complex piping systems efficiently. It stands out from the competition by providing flexibility in various industrial applications.
Reduced Maintenance
These valves reduce maintenance needs due to their sturdy construction and minimal wear on moving parts. With fewer parts requiring replacement, these valves experience less downtime, making them cost-effective over the long term. The reduction in maintenance not only saves time but also supports consistent performance in critical applications.
Improved Safety and Reliability
NTVAL Triple Eccentric Butterfly Valves improve safety and reliability by preventing the disc from sticking or jamming, even under extreme conditions. This consistent performance is essential for maintaining safe and continuous operations in various industrial settings.
Applications of Triple Eccentric Butterfly Valve
Refining and Petrochemical Process
Hot Gas Industry
Hydrocarbon Processing
Marine and Offshore Applications


3 Considerations When Buying Triple Eccentric Butterfly Valve
01
Requisitos de vazão
02
API AND ISO Certification
03
Sealing Mechanism
FAQS About Triple Eccentric Butterfly Valve
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