الوصف
Triple Eccentric Butterfly Valve, ASTM A216 WCB, 28 Inch, Class 300 LB, RF End
28 Inch Class 300 Triple Offset Butterfly Valve for High-Temperature and Critical Isolation Service
ال Triple Eccentric صمام فراشة (Triple Offset Butterfly Valve), 28 Inch, Class 300 LB, RF End, is engineered for demanding industrial applications requiring zero leakage performance, high-temperature resistance, and long service life. Manufactured from ASTM A216 WCB carbon steel, this valve incorporates an advanced triple offset sealing geometry that eliminates seat friction during operation, significantly reducing wear and extending operational reliability.
Designed in accordance with أبي 609, أسم B16.34, and related international standards, this valve is widely used in oil & gas, petrochemical, power generation, LNG, refinery, and industrial process systems where conventional resilient-seated valves cannot meet operating requirements.
The metal-to-metal sealing design delivers exceptional performance in high-pressure and high-temperature environments while maintaining low operating torque and tight shutoff capabilities.
Product Overview
| Item | تخصيص |
|---|---|
| اسم المنتج | صمام فراشة ثلاثي غريب الأطوار |
| نوع الصمام | Triple Offset Butterfly Valve |
| مقاس | 28 Inch (DN700) |
| تصنيف الضغط | ASME Class 300 |
| Body Material | ASTM A216 WCB |
| Disc Material | Stainless Steel / WCB |
| Seat Type | Metal Seat |
| نهاية الاتصال | Raised Face Flanged (RF) |
| معيار التصميم | أبي 609 |
| Pressure-Temperature Standard | أسم B16.34 |
| Face-to-Face | أبي 609 |
| Flange Standard | ASME B16.5 |
| Inspection & Testing | أبي 598 |
| Leakage Standard | ISO 5208 Rate A |
| تصميم آمن ضد الحرائق | Available |
| عملية | Gear, Electric, Pneumatic, Hydraulic |
What Is a Triple Eccentric Butterfly Valve?
A Triple Eccentric Butterfly Valve utilizes three offsets to eliminate friction between the disc sealing surface and seat during opening and closing operations.
First Offset
The shaft centerline is positioned behind the seat centerline.
Second Offset
The shaft centerline is offset from the pipeline centerline.
Third Offset
The sealing surface is machined into a conical geometry, creating a cam-like sealing action.
Benefits of Triple Offset Design
- Zero friction during operation
- Longer seat life
- Lower operating torque
- Bubble-tight shutoff
- Superior sealing reliability
- Excellent performance under thermal cycling
Product Features
Advanced Triple Offset Technology
Unlike double offset or concentric butterfly valves, the triple offset design prevents rubbing between sealing surfaces.
Advantages include:
- Reduced seat wear
- Increased service life
- Lower maintenance costs
- Improved shutoff performance
- Enhanced reliability in severe service
ASTM A216 WCB Carbon Steel Construction
The valve body is manufactured from ASTM A216 WCB cast carbon steel.
Benefits include:
- Excellent structural strength
- Good weldability
- Cost-effective performance
- Suitable for oil, gas, steam, and industrial services
- Proven performance in Class 300 applications
Metal-to-Metal Sealing System
The precision-machined sealing system offers:
- High temperature capability
- Resistance to erosion
- Resistance to thermal shock
- Long-term sealing performance
- Suitability for steam service
Raised Face Flanged Ends
RF flanged connections provide:
- Secure installation
- Easy maintenance access
- Compatibility with ASME piping systems
- Reliable gasket sealing performance
المواصفات الفنية
Materials of Construction
| Component | مادة |
|---|---|
| جسم | ASTM A216 WCB |
| القرص | Stainless Steel / WCB |
| Seat Ring | Stainless Steel Alloy |
| ينبع | الفولاذ المقاوم للصدأ |
| Bearing | PTFE / Graphite |
| Fasteners | Alloy Steel |
Design Standards
| معيار | وصف |
|---|---|
| أبي 609 | Butterfly Valve Design |
| أسم B16.34 | Valve Design |
| ASME B16.5 | Flanged Connections |
| أبي 598 | Inspection & Testing |
| ISO 5208 | Leakage Testing |
| MSS SP-68 | Butterfly Valve Standard |
Advantages of Triple Offset Butterfly Valves
Zero Leakage Performance
The torque-seated sealing mechanism provides exceptional sealing capability even in demanding service conditions.
High Temperature Capability
Metal seated triple offset valves can operate in temperatures significantly higher than soft-seated alternatives.
Suitable for:
- Steam systems
- Hot oil service
- Thermal processing
- Refinery operations
Long Service Life
The friction-free design dramatically reduces wear on sealing surfaces.
Benefits include:
- Lower maintenance costs
- Increased uptime
- Extended operational life
Fire-Safe Performance
Optional fire-safe construction can be supplied for critical oil and gas applications.
Working Principle
The valve operates through quarter-turn rotation.
Opening
- The actuator rotates the shaft.
- The triple offset geometry disengages the disc from the seat immediately.
- No rubbing occurs during travel.
- Full flow capacity is achieved.
Closing
- The disc rotates toward the seat.
- The final cam-like action creates sealing force.
- Metal-to-metal sealing occurs only at final closure.
- Tight shutoff is achieved.
This unique sealing action significantly extends seat life.
التطبيقات
Oil & Gas Industry
Suitable for:
- Transmission pipelines
- Refineries
- Tank terminals
- Offshore facilities
Petrochemical Plants
Used in:
- Process units
- Utility services
- Hydrocarbon processing
- High-temperature systems
Power Generation
Ideal for:
- Main steam systems
- Boiler applications
- Turbine auxiliary systems
- Cooling water systems
LNG Facilities
Applied in:
- Liquefaction plants
- Storage terminals
- Utility networks
- Process isolation systems
Chemical Processing
Suitable for:
- Corrosive fluids
- Process isolation
- Utility services
- High-temperature applications
Triple Offset vs Double Offset Butterfly Valve
| Feature | Triple Offset | Double Offset |
|---|---|---|
| Seat Wear | Minimal | Low |
| Sealing Performance | Excellent | Very Good |
| High Temperature Service | Excellent | Good |
| Leakage Rate | Near Zero | Low |
| Service Life | Longer | Long |
| Initial Cost | Higher | Lower |
For critical isolation and severe service applications, triple offset valves are generally preferred.
Triple Offset Butterfly Valve vs Gate Valve
| Feature | Triple Offset Butterfly Valve | صمام البوابة |
|---|---|---|
| Weight | Lower | |
| Installation Space | Smaller | |
| Operating Speed | Faster | |
| Maintenance | Lower | |
| Large Diameter Cost | Lower | |
| Automation | Easier |
For large-diameter Class 300 applications, triple offset butterfly valves often provide significant economic and operational advantages.
Quality Assurance
Every valve undergoes comprehensive quality control procedures including:
Hydrostatic Shell Test
Verifies body strength and integrity.
Seat Leakage Test
Confirms sealing performance.
Material Verification
Ensures traceability and compliance.
Dimensional Inspection
Confirms adherence to applicable standards.
Functional Testing
Verifies operating performance before shipment.
Optional Features
Actuation Options
- Gear Operator
- Electric Actuator
- Pneumatic Actuator
- Hydraulic Actuator
Seat Options
- Stainless Steel Seat
- Stellite Hardfaced Seat
- Inconel Overlay Seat
Compliance Options
- تصميم آمن ضد الحرائق
- نيس MR0175
- Low Fugitive Emission Design
- SIL Certification Support
Frequently Asked Questions
What is the benefit of a triple offset butterfly valve?
Triple offset valves eliminate seat friction during operation, providing longer service life and superior sealing performance.
Why choose a metal seated valve?
Metal seats offer higher temperature resistance, better wear resistance, and longer service life than soft seats.
Is ASTM A216 WCB suitable for Class 300 service?
Yes. ASTM A216 WCB is widely used in Class 300 industrial valve applications due to its excellent strength and durability.
Can this valve be used in steam systems?
Yes. The metal seated triple offset design is ideal for high-temperature steam service.
What industries commonly use triple offset butterfly valves?
Oil & gas, petrochemical, power generation, LNG, chemical processing, and industrial manufacturing.
Request a Quote
China Triple Offset Butterfly Valve Manufacturer
We provide:
✅ Factory Direct Pricing
✅ API 609 Compliant Manufacturing
✅ OEM & Custom Engineering Solutions
✅ Fast Production Lead Times
✅ Third-Party Inspection Support
✅ Global Export Experience
Send Your RFQ Today
Please provide:
- Valve Size (28 Inch / DN700)
- Pressure Rating (Class 300)
- Media Type
- درجة حرارة التشغيل
- Actuation Requirements
- Quantity Required
Our engineering team will provide a detailed quotation, technical datasheet, GA drawing, and production schedule within 24 hours.
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