2″-300LB SS Bellow Seal Flange End Gate Valve
Description
TECHNICAL DATA SHEET
Product Name: 2-inch 300LB Stainless Steel Bellows Seal Gate Valve
Model/Specification: 2″-300LB-SS-Bellow
Valve Type: Gate Valve (Bellows Sealed)
Connection Type: Flanged (RF) / Butt Weld (BW) / Socket Weld (SW) User specified
1. Basic Design Parameters
| Parameter | Standard/Specification |
|---|---|
| Size | 2 inches (DN 50) |
| Pressure Class | Class 300 LB (PN 50) |
| Body Material | Stainless Steel (ASTM A182 F304 / F316 / F316L) |
| Manufacturing Process | Forged / Cast (depending on manufacturer) |
| Design Standard | API 602 / ASME B16.34 |
| End Connection Standard | ASME B16.5 (Flanged RF/RTJ), ASME B16.25 (BW), ASME B16.11 (SW) |
| Face to Face Standard | ASME B16.10 |
| Test & Inspection Std. | API 598 |
| Emission Compliance | ISO 15848-1 / TA-Luft (optional) |
2. Technical Specifications
| Parameter | Details |
|---|---|
| Bonnet Type | Bolted Bonnet with Bellows Seal Assembly |
| Stem Type | Outside Screw and Yoke (OS&Y), Rising Stem |
| Gate Type | Flexible Wedge / Solid Wedge |
| Sealing Principle | Double seal: Primary Bellows Seal + Secondary Gland Packing |
| Bellows Material | Stainless Steel (SS304, SS316L) / Inconel 625 |
| Applicable Media | Steam, Toxic/Hazardous Fluids, Heat Transfer Oil, Corrosive Media |
| Temperature Range | -29°C to 595°C (depending on trim) |
| Operation | Handwheel / Gear Operated / Electric Actuator |
3. Material of Construction (Recommended – Stainless Steel)
| Part Name | Material | Standard/Grade |
|---|---|---|
| Body | Forged Stainless Steel | ASTM A182 F316 / F316L |
| Bonnet | Forged Stainless Steel | ASTM A182 F316 / F316L |
| Gate / Wedge | Stainless Steel + Hardfacing | A182 F316 + Stellite (optional) |
| Seat Ring | Stainless Steel + Hardfacing | A182 F316 + Stellite / Integral |
| Stem | Stainless Steel | ASTM A182 F316 (ground and polished) |
| Bellows | Stainless Steel | SS304, SS316L, or Inconel 625 |
| Bonnet Gasket | Spiral Wound | Graphite + 304SS |
| Packing (Backup) | Flexible Graphite / PTFE | Low Sulfur, High Temp |
| Stem Nut | Aluminum Bronze | ZQA19-4 / C95400 |
| Studs/Nuts | Stainless / Alloy Steel | ASTM A193 B8 / A194 8 |
| Handwheel | Ductile Iron / Carbon Steel | ASTM A536 / A216 WCB |
4. Main Dimensions & Connection Details
Note: Dimensions are for Flanged Ends (RF) according to ASME B16.10 and ASME B16.5. BW end length may vary.
4.1 End-to-End Dimensions (Face-to-Face)
| Size | Class | L (RF) mm | H (Closed) mm | W (Handwheel) mm | Weight (approx. kg) |
|---|---|---|---|---|---|
| 2″ | 300LB | 216 | ~ 370 | 220 | ~ 38 |
4.2 Flange Details (Per ASME B16.5 – Class 300)
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Flange Diameter (OD): 165 mm (6.5 in)
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Bolt Circle Diameter: 127 mm (5.0 in)
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Number of Bolt Holes: 8
-
Bolt Hole Size: 3/4 in (19 mm)
-
Hub Diameter: 92 mm (3.62 in)
-
Raised Face Height: 2 mm (0.06 in)
4.3 Weld End Preparation (if BW – per ASME B16.25)
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Bevel Angle: 37.5° (±2.5°)
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Root Face: 1.6 mm (1/16″) nominal
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Counterbore: To match pipe schedule (e.g., Sch. 40, Sch. 80) as specified.
5. Pressure-Temperature Rating (ASME B16.34)
*Material Group: 2.1 / 2.2 (Stainless Steel – A182 F304/F316)*
| Temperature (°C) | Working Pressure (MPa) | Working Pressure (psig) |
|---|---|---|
| -29 to 38 | 5.10 | 740 |
| 100 | 4.80 | 695 |
| 200 | 4.35 | 630 |
| 250 | 4.14 | 600 |
| 300 | 3.95 | 575 |
| 400 | 3.70 | 535 |
| 500 | 3.20 | 465 |
Note: Actual rating depends on specific grade (CF8, CF8M, F304, F316). Consult manufacturer for exact values above 400°C.
6. Test Pressure (API 598)
| Test Type | Medium | Pressure (MPa) | Pressure (psig) | Note |
|---|---|---|---|---|
| Shell Test | Water | 7.65 | 1,110 | 1.5 x 38°C Rating |
| High-Pressure Seat Test | Water | 5.61 | 815 | 1.1 x 38°C Rating |
| Low-Pressure Seat Test | Air/N2 | 0.5 – 0.7 | 70 – 100 | Optional |
| Bellows Leak Test | Helium | < 1 x 10⁻⁶ mbar·L/s | — | Optional (for fugitive emission compliance) |
7. Features & Applications
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Key Features:
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Zero Leakage (Hermetic Seal): The multi-ply stainless steel bellows is welded to the stem and bonnet, creating a metal barrier that prevents fugitive emissions and ensures environmental safety.
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Double Seal Safety: Incorporates a secondary graphite packing as a backup in case of bellows failure, ensuring operational integrity.
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Maintenance-Free Stem: Eliminates the need for frequent packing adjustments or replacements, reducing downtime.
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Long Cycle Life: Bellows design accommodates thousands of open/close cycles without fatigue (up to 10,000+ cycles).
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Corrosion Resistance: Full stainless steel construction (body, bonnet, bellows) provides excellent resistance to corrosive media.
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Backseat Design: Protects the bellows and packing from system pressure when the valve is fully open.
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OS&Y Design: Provides visual indication of valve position.
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Main Applications:
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Petrochemical & Refinery Plants (handling hydrocarbons, H₂S)
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Thermal Oil Systems & Heat Transfer Fluids
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Steam Systems (Power Generation)
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Chemical Processing (corrosive/toxic fluids)
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Pharmaceutical & High-Purity Applications
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Applications requiring compliance with strict fugitive emission regulations (ISO 15848, TA-Luft)
-
Disclaimer: The above data is prepared based on common standards for bellows seal gate valves. Specific dimensions, materials, and pressure ratings may vary by manufacturer. The final technical agreement shall prevail.
