2″-1500LB-SW F91 Bellows Seal Gate Valve
Description
Technical Datasheet
Product Name: Alloy Steel F91 Bellows Seal Gate Valve
Model: 2″-1500LB SW F91 Bellows Seal Gate Valve
1. General Information
| Item | Specification |
|---|---|
| Valve Type | Gate Valve (OS&Y, Rising Stem) |
| Nominal Size | 2 inches (DN50) |
| Pressure Rating | Class 1500 |
| Connection Type | Socket Weld (SW) Ends |
| Special Design | Bellows Seal (Hermetic stem sealing) |
| Body / Bonnet Material | ASTM A182 F91 (Chrome-Moly-Vanadium Alloy Steel) |
| Operation | Handwheel (Manual) / Gearbox optional (recommended for high-pressure applications) |
2. Technical Specifications
| Item | Specification |
|---|---|
| Pressure Rating | Class 1500 (PN260) |
| Shell Test Pressure | Approx. 3750 psi (25.9 MPa) |
| Seal Test Pressure | Approx. 2775 psi (19.1 MPa) |
| Design Temperature | -29°C to +593°C (Up to 1100°F) – Suitable for high-temperature steam and hydrocarbon services |
| Applicable Media | High-temperature steam, superheated water, high-pressure hydrocarbons, power plant applications, refinery services |
| Bonnet Type | Bolted Bonnet with Backseat |
3. Main Material of Parts
| Part Name | Material | Material Grade (Reference) |
|---|---|---|
| Body | Forged Alloy Steel | ASTM A182 F91 (9Cr-1Mo-V) |
| Bonnet | Forged Alloy Steel | ASTM A182 F91 |
| Wedge / Gate | Alloy Steel + Hard-facing | F91 / F22 with Stellite 6 hard-facing (seat surfaces) |
| Stem | Stainless Steel / Alloy | ASTM A182 F6a (13Cr) / Inconel 718 / 17-4PH(for high-temperature strength) |
| Bellows Assembly | Stainless Steel | ASTM A240 316L / Inconel 625 (Multi-ply, fully welded) |
| Seat Rings | Alloy Steel + Hard-facing | F91 / F22 with Stellite 6 hard-facing (integral or welded) |
| Gland Packing | Flexible Graphite | High-density graphite with anti-extrusion rings |
| Gasket | Spiral Wound | 316SS + Flexible Graphite (with inner/outer rings) |
| Bonnet Bolts / Studs | Alloy Steel | ASTM A193 B16 (high-temperature alloy steel) |
| Bonnet Nuts | Alloy Steel | ASTM A194 4 / 7 |
| Handwheel | Carbon Steel / Ductile Iron | – |
4. Main Dimensions & Connection Data (Unit: mm)
Note: Socket Weld ends conform to ASME B16.11.
| Size (NPS) | Socket Bore Dia (B) | Socket Depth (L2) | Face to Face (End to End) (L) | Top to Bottom Height (H) approx. | Handwheel Dia (W) approx. |
|---|---|---|---|---|---|
| 2″ (DN50) | 62.5 | 13 | ASME B16.10: 368 mm (Class 1500, Short Pattern) | Varies by design | Varies by design (typically gear-operated for Class 1500) |
Note: Dimensions above are typical. For Class 1500, gear operator is commonly used due to high torque requirements. Final dimensions should be based on approved manufacturer drawings.
5. Applicable Design Standards
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Design & Manufacture: API 602 (Compact Forged Valves) / ASME B16.34
-
Face-to-Face Dimensions: ASME B16.10
-
End Connections: ASME B16.11 (Socket Weld)
-
Pressure-Temperature Rating: ASME B16.34
-
Inspection & Testing: API 598
-
Bellows Design: ISO 15761 / BS 6364 (adapted for high-temperature)
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Material Specifications: ASTM A182 F91
6. Product Features
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F91 Alloy Steel Construction: ASTM A182 F91 (9Cr-1Mo-V) provides exceptional high-temperature creep strength and oxidation resistance, making it ideal for supercritical and ultra-supercritical power plant applications up to 593°C (1100°F).
-
Bellows Seal: Fully welded stainless steel (or Inconel) bellows provides a hermetic seal, eliminating fugitive emissions and ensuring zero stem leakage—critical for high-temperature steam and hazardous services.
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Class 1500 Pressure Rating: Designed for extreme high-pressure applications, ensuring safe operation in demanding environments.
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Socket Weld Ends: Provides a permanent, high-integrity connection suitable for high-pressure, high-temperature piping systems; eliminates flange leaks.
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Hard-Faced Trim: Stellite 6 hard-facing on wedge and seat surfaces provides excellent wear resistance and tight shut-off under severe service conditions.
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Backseat Feature: Allows for packing replacement under pressure (when valve is fully open), enhancing safety and reducing maintenance downtime.
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Gear Operator (Recommended): Due to the high torque required for Class 1500 gate valves, a gear operator is typically provided for smooth and easy operation.
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High-Temperature Bolting: ASTM A193 B16 studs and A194 4 nuts provide reliable bolting integrity at elevated temperatures.
Remarks:
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Material Significance: F91 is a high-performance chromium-molybdenum-vanadium alloy steel specifically designed for high-temperature applications such as superheater headers, main steam lines, and turbine bypass systems.
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Bellows Material: For extremely high-temperature services (above 500°C), consider Inconel 625bellows instead of 316L for enhanced thermal stability.
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Inspection: For critical power plant applications, specify NDE (Non-Destructive Examination) requirements such as liquid penetrant testing (PT) and radiographic testing (RT) per ASME B16.34.
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Gear Operator: Class 1500 gate valves typically require a gear operator due to high operating torque. Confirm inclusion with manufacturer.
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For specific dimensional data, torque values, and NDE requirements, please refer to the official certified drawings and inspection test plans (ITP) from the manufacturer.
