Introduction
The API Triple Offset Flanged Butterfly Valve is a quarter-turn industrial valve designed to start, stop, and regulate flow in high-pressure and high-temperature pipeline systems.
Product Parameters
|
Parameter |
Value / Range |
|
Pressure Class |
ASME Class 150 / 300 / 600 |
|
Minimum Temperature |
-196°C (-320°F) |
|
Maximum Temperature |
+815°C (+1500°F) |
|
Hydrostatic Test Pressure |
1.5 × rated pressure |
|
Low-Temperature Material Option |
ASTM A352 LCC / LCB |
|
High-Temperature Material Option |
ASTM A217 WC6 / WC9 |
|
Vacuum Service Capability |
Down to 10⁻² torr |
|
Code Compliance |
ASME B16.34 |
|
Thermal Expansion Reliability |
Continuous cycling design |
Key Features
Triple-Offset Frictionless Kinematics: The seat contacts the seal ring only at the final point of closure to eliminate operational friction and reduce seat wear.
Lower Operating Torque: Frictionless stem rotation lowers breakaway torque requirements, reducing the required actuator size and operational wear.
Bi-Directional Zero-Bubble Shutoff: Meets ISO 5208 Rate A / API 598 resilient-seated leakage criteria under full rated differential pressure.
Stellite 6 Hardfaced Body Seat: Minimum 3.0mm cobalt-base alloy weld overlay prevents seat galling during high-velocity flow transitions.
Applications
Cryogenic LNG Regasification (-196°C): Extended gas-column bonnets keep stem packing above 0°C to maintain sealing integrity and prevent fugitive emissions.
High-Pressure Superheated Steam: Thermal expansion-matched trims prevent valve binding during rapid thermal cycling in Class 600 main steam isolation.
Boiler Blowdown Loops: Hardened trim materials resist high-pressure drop flashing during continuous blowdown operations.
Abrasive Hydrocarbon Slurries: Hardfaced sealing surfaces are tested in fluid media containing 12% to 18% catalyst fines at velocities up to 25 m/s without erosive failure.
Commercial Terms
Standard Lead Times: Shipment within 6 to 8 weeks ex-works for sizes DN150 (6-inch) to DN300 (12-inch) in Class 150/300 WCB or CF8M stainless steel.
Minimum Order Quantities: MOQ of 1 unit for stock configurations; 5-unit MOQ applies to custom flange drillings or non-standard face-to-face dimensions.
Custom Engineering Options: Factory configuration of extended cryogenic stems and live-loaded Belleville packing washers upon request.
Actuator Integration: Complete assembly and loop-testing performed during Factory Acceptance Testing (FAT) using specified major actuator brands.
Certification & Compliance
Fire Safety Certifications: Fully type-tested and certified to API 607 and ISO 10497 standard specifications.
Fugitive Emission Compliance: Certified to API 622 and ISO 15848-1 Class AH to meet regional low-emission environmental mandates.
Quality & Material Traceability: Supplied with EN 10204 3.1 Mill Test Reports and 100% hydrostatic pressure test logs per API 598.
Non-Destructive Testing (NDT): Compliance verified via Radiographic (RT), Magnetic Particle (MT), and Penetrant (PT) inspection per ASME Section V.
Functional Safety Integrity: Certified SIL 2 capable for bare-shaft valves; SIL 3 compliance is system-architecture dependent on final actuator and logic solver configuration.
FAQ
Q: What is the expected operational lifespan of this valve in continuous industrial service?
A: In high-duty LNG, steam, and refinery applications, the valve is engineered for approximately 8–12 years of continuous service under full pressure and thermal cycling. In lower-cycle or standby systems, service life can extend beyond 15 years with routine maintenance.
Q: How many full operating cycles can the sealing system withstand without leakage degradation?
A: The sealing system is validated for roughly 50,000–80,000 full stroke cycles while maintaining API 598 leakage performance.
Q: Has this valve been verified by independent third-party inspection organizations?
A: Yes, production batches can be inspected by agencies such as TÜV, BV, or DNV based on project requirements. These inspections typically cover pressure integrity, material compliance, and fugitive emission performance.
Q: What maintenance intervals are recommended for long-term industrial operation?
A: Under clean gas service, packing systems typically require adjustment every 18–24 months, while full internal inspection is recommended every 3–5 years.
Q: Can the valve maintain sealing performance under repeated cryogenic thermal cycling?
A: Yes, the design is qualified for repeated transitions between ambient and -196°C conditions without loss of structural stability. Packing and stem sealing systems are designed to remain stable after more than 1,000 cryogenic thermal cycles.
Q: How is full traceability ensured for each delivered valve?
A: Each valve is assigned a unique serial number linked to raw material heat numbers, machining records, and inspection reports. This allows full lifecycle traceability from installed unit back to steel melt batch.
Q: What pre-shipment validation tests are performed before delivery?
A: Each valve undergoes hydrostatic shell testing, seat leakage verification, and torque curve analysis before shipment. Critical sizes may also undergo extended hold-pressure testing to validate long-duration sealing stability under API 598 requirements.
Q: What warranty and service response structure is provided for industrial buyers?
A: Standard warranty covers 24 months from installation or 30 months from shipment, whichever comes first. Critical failure support requests are typically responded to within 48 hours with technical diagnosis support.
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