Overview
The GB Standard Triple Offset Flanged Butterfly Valve is a quarter-turn rotary valve engineered for bi-directional, zero-leakage isolation in high-pressure and extreme-temperature piping systems.
Product Specifications
|
Category |
Specification Detail |
|
Design Standard |
GB/T 12238 triple offset butterfly valve structural design compliance |
|
Face-to-Face Dimensions |
GB/T 12221 Series 20 standardized installation length |
|
Flange Compatibility |
GB/T 9113 / EN 1092-1 raised face flange connection |
|
Size Range |
DN80 – DN2000 (typical industrial pipeline applications) |
|
Pressure Rating |
PN10 – PN40 (design dependent on material and service conditions) |
|
Temperature Range |
-196°C to +550°C (material and sealing configuration dependent) |
|
Seat Structure |
Metal-to-metal sealing with Stellite 6 hardfacing overlay (≥3.0 mm) |
|
Cycle Life |
≥50,000 full open/close cycles under rated operating conditions |
|
Actuator Interface |
ISO 5211 mounting pad for pneumatic, electric, or hydraulic actuators |
Applications
Refinery & Petrochemical Process: Suitable for crude oil fractionation lines, diesel fuel, and volatile organic compounds (VOCs); verified to meet API 598 leakage criteria under recorded high-pressure thermal cycles.
District Heating Networks: High-cycle metal-to-metal sealing rated for superheated water loops (+120 °C to +250 °C), designed to maintain seating integrity under rapid thermal shock.
Cryogenic Service: Extended bonnet configurations for LNG handling down to −196 °C, maintaining stem packing temperature above 0 °C.
Corrosive & Slurry Media: Special metallurgy (Duplex/Hard-faced seats) specified for wet chlorine, acids, and blast furnace gas containing solids up to 50 mg/m³.
Custom Engineering
Torque Integration: Valve-to-actuator matching engineered to align with ISO 5211 dimensions, incorporating a ≥ 1.3 safety factor to ensure dependable operation under full differential pressure (ΔP).
Alloy Metallurgy: Custom casting options, including Duplex 2205, Super Duplex 2507, and Monel to mitigate stress corrosion cracking (SCC), extending valve service life in coastal and offshore environments.
Actuation Integration: Factory mounting, calibration, and loop-testing available for pneumatic scotch-yoke, electric multi-turn, and electro-hydraulic actuators.
Bypass & Retrofit: Integrated bypass piping available for DN600+ lines to balance pressure, alongside customizable face-to-face dimensions to fit legacy piping footprints without field modification.
Supply Chain Support
Standard Delivery Time: 35 calendar days from signed and approved technical drawings for standard DN80 to DN300 valves.
Minimum Order Quantity: 1 unit MOQ for standard carbon steel (WCB); 5 units for custom alloy or high-specification configurations.
Emergency Support: Safety stock of raw cast bodies (WCB and CF8M) maintained for 48-hour emergency assembly and dispatch during unscheduled plant shutdowns.
Logistics & Documentation: FOB, CIF, or DDP shipping to European and North American hubs with mandatory provision of certified foundry heat numbers and pressure test reports upon compliance hold points.
Maintenance & Spare Parts Kits
In-line replaceable seal rings allow seat renewal without removing the valve body from the pipeline, minimizing direct labor and plant downtime.
Job-site ready kits containing 1x multi-layer laminated seal ring, 1x graphite bonnet gasket, and 2x sets of V-ring graphite stem packing to support routine turnarounds.
Certifications & Compliance
Design & Test Standards: Designed in accordance with GB/T 12238 and API 609; hydrostatic and pneumatic testing performed per ISO 5208 Rate A, aligned with GB/T 13927 procedures.
Fire-Safe Design: Certified to API 607, API 6FA, and ISO 10497 for hazardous environments.
Fugitive Emissions: Validated to ISO 15848-1 Class BH under continuous thermal cycling to guarantee fugitive emissions compliance.
Material Traceability: Standard provision of EN 10204 Type 3.1 material certificates and mandatory Positive Material Identification (PMI) for all pressure-retaining components.
Non-Destructive Testing (NDT): 100% Radiographic Testing (RT) for cast bodies and Magnetic Particle Testing (MT) for critical weld zones executed upon technical specification.
FAQ
Q: Are production facilities certified under international quality systems?
A: Manufacturing is operated under ISO 9001-based quality management systems with documented process audits. Regular internal and external audits are conducted annually.
Q: Is there third-party validation for pressure and leakage performance?
A: Yes, testing is conducted through accredited independent laboratories such as TÜV-style inspection agencies and national valve testing centers. Each batch is issued a unique test report linked to heat numbers for traceability.
Q: What is the realistic service life under industrial operating conditions?
A: Under standard refinery or district heating duty, the expected operational lifespan is typically 8–10 years. In lower-cycle applications, service life can extend beyond 12 years with scheduled maintenance.
Q: What failure modes are most commonly tested during product validation?
A: Testing focuses on seat leakage under thermal cycling, stem packing wear, and torque deviation under pressure fluctuation. Accelerated fatigue tests simulate repeated thermal shock conditions over thousands of cycles.
Q: Can you provide torque calculation support for actuator selection?
A: Yes, torque is calculated based on differential pressure, seat friction coefficient, and thermal expansion factors. Full torque charts are available upon request for system integration.
Q: What warranty coverage is provided for industrial use?
A: Standard warranty coverage is 24 months from installation or 30 months from shipment, whichever comes first. It includes manufacturing defects and sealing performance under specified operating conditions. Wear parts such as seals are excluded but available as replacement kits.
Q: How fast is technical support available during plant downtime?
A: Emergency engineering support response is typically within 24 hours for critical shutdown scenarios. Remote diagnosis is provided within the first 12 hours after technical data submission.
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