Triple Offset Butterfly Valve – High Temperature / High Pressure Ready for Actuators
Description
TECHNICAL DATA SHEET
Triple Offset Butterfly Valve – High Temperature / High Pressure
24″ (DN600) · Class 600LB · Double Flanged · With Thermal Fins
1. PRODUCT DESCRIPTION
The Triple Offset Butterfly Valve is a high-performance metal-seated quarter-turn valve engineered for demanding high-temperature and high-pressure service conditions where conventional soft-seated valves cannot perform reliably. Featuring a triple offset (axial, radial, and angular) design geometry, this valve ensures zero friction between the disc and seat during opening and closing, with sealing engagement occurring only at the final point of closure. This unique design eliminates galling and scratching of sealing surfaces, delivering extended service life, low operating torque, and bubble-tight bidirectional shut-off even under extreme thermal cycling.
This 24-inch (DN600) Class 600LB double-flanged configuration is specifically equipped with integral thermal cooling fins on the upper body neck / bonnet extension to dissipate heat and protect the stem packing, stuffing box, and actuator mounting area from excessive temperatures. The valve is ideally suited for steam isolation, high-temperature oil/gas, thermal fluid systems, and critical process services in power generation, petrochemical, and refinery applications.
2. DESIGN FEATURES
| Feature | Description |
|---|---|
| Valve Type | Triple offset (triple eccentric) metal-seated butterfly valve |
| Offset Geometry | Three offsets: axial, radial, and angular (elliptical seat geometry) – ensures frictionless operation with sealing only at point of closure |
| Sealing Principle | Torque-seated metal-to-metal sealing; bidirectional zero leakage (ANSI Class VI bubble-tight) |
| Connection Type | Double flanged (long pattern) – ASME B16.5 / B16.47 compliant |
| Flow Direction | Fully bidirectional |
| Seat Design | Laminated metal seal (multi-layer 304 stainless steel + graphite) or full Stellite hardfacing |
| Stem Design | Anti-blowout stem with externally retained gland design per API 609 Category B |
| Stem Sealing | Flexible graphite packing in extended stuffing box, self-sealing gland, anti-blowout design |
| Actuator Mounting | ISO 5211 top mounting flange |
| Fire-safe | Inherently fire-safe design (metal-to-metal sealing); optional API 607 / 6FA certification |
| Maintenance | Adjustable stem packing with easy access without actuator removal |
3. THERMAL COOLING FINS – KEY FEATURE
| Feature | Description |
|---|---|
| Design | Cast or welded integral cooling fins on upper body neck / bonnet extension |
| Function | Block heat bridge; dissipate heat from line media before reaching packing and actuator |
| Material | Carbon steel or stainless steel (matching body material) |
| Benefit | Enables continuous operation at media temperatures up to 650°C (1200°F)while maintaining safe packing/actuator temperatures |
4. TECHNICAL SPECIFICATIONS
4.1 General Parameters
| Parameter | Specification |
|---|---|
| Size | 24 inches (DN600) |
| Pressure Rating | Class 600LB (PN100) |
| Design Standard | API 609 (Category B), ASME B16.34, BS EN 593 |
| Face-to-Face Dimensions | API 609 / ASME B16.10 / ISO 5752 Series 13 & 20 |
| Flange Connection | ASME B16.5 (RF or RTJ) |
| End Connections | Double flanged (long pattern) |
| Top Flange | ISO 5211 |
4.2 Operating Conditions
| Parameter | Specification |
|---|---|
| Maximum Working Pressure | 10.0 MPa (100 bar) / Class 600 |
| Maximum Media Temperature (with cooling fins) | Up to 650°C (1200°F) |
| Standard Temperature Range | -46°C to +425°C |
| Extended Temperature Range | Up to +538°C (with suitable materials); up to +700°C with special alloys |
| Applicable Media | Steam, high-temperature oil, high-temperature flue gas, thermal fluid, superheated water, process gases |
5. MATERIAL SPECIFICATION
| Component | Standard Material | Optional Materials |
|---|---|---|
| Body | WCB (Carbon Steel, ASTM A216 Gr. WCB) | WC9 (Cr-Mo steel, high temp), CF8 (304 SS), CF8M (316 SS), LCB/LCC (low temp), Alloy 20, Duplex / Super Duplex |
| Disc | WCB / Carbon Steel | 304 SS, 316 SS, Alloy Steel (high-temp grade), Duplex SS |
| Stem / Shaft | 2Cr13 Stainless Steel | 17-4PH, Inconel (high-temp high-strength), 304 SS, 316 SS, XM-19 |
| Seat / Seal Face | Multi-layer metal seal (304 SS + graphite) | Full Stellite hardfacing (wear & erosion resistant), Inconel overlay |
| Bushing / Bearing | Self-lubricating metal-graphite (high temp) | High-temp alloy + solid lubricant coating |
| Packing / Gasket | Flexible graphite (high temp) | Ceramic fiber + graphite combination (ultra-high temp) |
| Cooling Fin Material | Carbon steel (matching body) | Stainless steel |
| Bolting | Alloy steel / stainless steel | NACE MR 01-75 compliant |
6. PERFORMANCE & TESTING
| Test | Standard | Requirement |
|---|---|---|
| Body Shell Test | API 598 | 1.5 × rated pressure |
| Seat Leak Test | API 598 / ANSI/FCI 70-2 | Bidirectional zero leakage; ANSI Class VI (bubble-tight) |
| Pressure-Temperature Rating | ASME B16.34 | Per class rating chart |
| Fire-safe Test | API 607 / API 6FA (optional) | Inherently fire-safe (metal seat) |
| Fugitive Emissions | ISO 15848 | < 50ppm |
| NACE Compliance | MR 01-75 / ISO 15156 (optional) | — |
| Flow Characteristic | Approximate equal percentage | — |
| Rangeability | 30:1 to 100:1 | — |
7. DIMENSIONS (24″ – Class 600 – Double Flanged)
Dimensions are for reference. Consult factory for certified drawings.
| Parameter | Value |
|---|---|
| Size | 24″ (DN600) |
| Face-to-Face (Long Pattern) | Per API 609 / ASME B16.10 |
| Flange Standard | ASME B16.5 Class 600 RF / RTJ |
| Flange Bolt Circle | Per ASME B16.5 |
| Number of Bolt Holes | Per ASME B16.5 |
| Overall Height (incl. cooling fins) | To be confirmed by manufacturer |
| Approx. Weight | Consult manufacturer |
Note: Cooling fin structure increases overall valve height significantly; confirm with manufacturer for specific project dimensions.
8. ACTUATION OPTIONS
| Option | Details |
|---|---|
| Manual | Handwheel with worm gear operator |
| Pneumatic | Double-acting or spring-return |
| Electric | On-off or modulating |
| Electro-hydraulic | For high-torque requirements |
| Mounting | ISO 5211 top flange |
9. APPLICATIONS
-
Power generation – steam isolation, turbine bypass, boiler feedwater
-
Petrochemical & refining – high-temperature hydrocarbon processing, catalyst regeneration
-
Oil & gas – pipeline manifolds, wellhead test separation, gas processing
-
Chemical processing – high-temperature corrosive media, thermal fluid systems
-
Metallurgy – smelting plants, high-temperature flue gas
-
District heating / cooling – steam and thermal fluid distribution
-
Cogeneration / CHP – heat recovery steam generator (HRSG) isolation
10. KEY ADVANTAGES
| Advantage | Description |
|---|---|
| Zero Friction Operation | Triple offset design eliminates seat rubbing; sealing only at point of closure |
| Extended Service Life | No galling or scratching of sealing surfaces; high cycle life |
| Bidirectional Shut-off | Fully bi-directional bubble-tight sealing |
| High Temperature Capability | Up to 650°C with cooling fins |
| Low Operating Torque | Reduced actuator size and energy consumption |
| Thermal Cycling Resistance | Continued seal integrity through thermal cycling |
| Inherently Fire-safe | Metal-to-metal sealing provides fire-safe design without additional soft seals |
| Fugitive Emission Control | < 50ppm; ISO 15848 compliant |
11. OPTIONS & CUSTOMIZATIONS
| Option | Details |
|---|---|
| Body Materials | WCB, WC6, WC9, CF8, CF8M, LCB, LCC, Duplex, Super Duplex, Inconel, Hastelloy |
| Seat Hardfacing | Stellite, Inconel, Colmonoy |
| End Connections | Double flanged (standard), butt-weld, lug, wafer |
| Face-to-Face | Short pattern or long pattern (gate valve replacement) |
| Actuator | Manual gear, pneumatic, electric, electro-hydraulic |
| Fire-safe Certification | API 607 / API 6FA |
| Fugitive Emission | ISO 15848 certified |
| NACE | MR 01-75 / ISO 15156 compliant materials |
| Special Cleaning | For oxygen service or ultra-pure applications |
12. APPLICABLE STANDARDS
| Standard | Description |
|---|---|
| API 609 | Butterfly Valves: Double-Flanged, Lug- and Wafer-Type (Category B) |
| ASME B16.34 | Valves — Flanged, Threaded, and Welding End |
| ASME B16.10 | Face-to-Face and End-to-End Dimensions |
| ASME B16.5 | Pipe Flanges and Flanged Fittings (up to 24″) |
| ASME B16.47 | Large Diameter Steel Flanges |
| API 598 | Valve Inspection and Testing |
| ANSI/FCI 70-2 | Control Valve Seat Leakage |
| ISO 5752 | Face-to-Face Dimensions |
| BS EN 593 | Industrial Valves — Butterfly Valves |
| API 607 / API 6FA | Fire-safe Testing (optional) |
| ISO 15848 | Fugitive Emissions (optional) |
| NACE MR 01-75 | Sulfide Stress Cracking Resistant Materials (optional) |
This technical data sheet is for general reference only. Specifications are subject to change without prior notice. For specific project requirements, including certified dimensions, material certifications, and custom engineering, please consult the manufacturer.
