DN50-PN16 Welded Flanged Close Die Forged Gate Valve
Description
British Standard Forged Steel Gate Valve Technical Data Sheet (BS Series)
A105N Material DN50 PN16 Welded Flange
1. General Information
| Item | Specification |
|---|---|
| Valve Type | Forged Steel Gate Valve |
| Design Standard | BS 5352 / API 602 / ASME B16.34 |
| Nominal Size | DN50 (2 inch) |
| Pressure Class | PN16 (Equivalent to Class 150 LB) |
| Structure Type | OS&Y (Outside Screw and Yoke), Bolted Bonnet |
| Connection Type | Welded Flange |
| Operation | Handwheel |
| Body Material | ASTM A105N (Forged Carbon Steel, suitable for NACE MR0175) |
2. Applicable Standards
| Item | Standard Code |
|---|---|
| Design & Manufacturing | BS 5352, API 602, ASME B16.34 |
| Face-to-Face / End-to-End | BS EN 558-1 (Series 1) / Manufacturer Standard |
| Flanged Connections | ASME B16.5 (Class 150) |
| Test & Inspection | API 598 |
| Pressure-Temperature Rating | ASME B16.34 |
| Valve Marking | MSS SP-25 |
3. Main Design Features
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Body Construction: One-piece die forged body, dense structure, high strength, eliminates casting defects
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Bonnet Connection: Bolted bonnet design with 304/Flexible Graphite spiral wound gasket sealing
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Wedge Design: Solid wedge, fully guided design, minimizes wear, reliable sealing
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Stem Design: Backseat feature allows packing replacement under pressure when valve is fully open
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Seating Surface: Seat rings hardfaced with Stellite for durability
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Packing: Flexible graphite packing, low emission design
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Seat Rings: Renewable seat rings, made from hardened stainless steel
4. Main Component Materials (A105N Material)
| Item | Part Name | Material | Standard/Remark |
|---|---|---|---|
| 1 | Body | ASTM A105N | Forged Carbon Steel, Normalized |
| 2 | Bonnet | ASTM A105N | Forged Carbon Steel |
| 3 | Wedge | ASTM A276 410 / A105N+STL | 13Cr Stainless Steel or Hardfaced |
| 4 | Seat Ring | ASTM A276 410 / STL Hardfaced | Hardened Stainless Steel, Renewable |
| 5 | Stem | ASTM A182 F6a (13Cr) | Stainless Steel |
| 6 | Gasket | 304 + Flexible Graphite | Spiral Wound |
| 7 | Packing | Flexible Graphite | Low emission design |
| 8 | Gland Bushing | ASTM A276 410 | Stainless Steel |
| 9 | Gland Flange | ASTM A105 | Carbon Steel |
| 10 | Bonnet Bolt | ASTM A193 Gr.B7 | Alloy Steel |
| 11 | Bonnet Nut | ASTM A194 Gr.2H | Heavy Hex Nut |
| 12 | Handwheel | ASTM A197 | Malleable Cast Iron |
5. Technical Parameters & Dimensions
5.1 Pressure-Temperature Ratings
| Item | Parameter |
|---|---|
| Nominal Pressure | PN16 (1.6 MPa) |
| Shell Test Pressure | 2.4 MPa (Hydrostatic) [API 598] |
| High-Pressure Seat Test Pressure | 1.76 MPa (Hydrostatic) [API 598] |
| Low-Pressure Pneumatic Test Pressure | 0.5 – 0.7 MPa (Air) [API 598] |
| Temperature Range | -29°C ~ 425°C |
| Applicable Media | Water, steam, oil, etc. |
5.2 Dimensions (DN50 PN16 Welded Flange)
| Dimension | Value | Remark |
|---|---|---|
| End-to-End Length (L) | 178 mm | For PN16/Class 150, per BS EN 558-1 Series 1 |
| Height (H-OPEN) | Approx. 284 mm | Fully open position |
| Handwheel Diameter (W) | 180 mm | |
| Flange Diameter (D) | 152.4 mm | ASME B16.5 Class 150 2″ RF |
| Flange Thickness (T) | 19.1 mm | ASME B16.5 Class 150 2″ RF |
| Bolt Circle Diameter | 120.7 mm | ASME B16.5 Class 150 2″ RF |
| Number of Bolt Holes/Size | 8 / 19 mm | ASME B16.5 Class 150 2″ RF |
| Flange Sealing Face | Raised Face | ASME B16.5 |
| Bore Diameter (d1) | 33 mm | Reduced bore, typical API 602 design |
| Weight | Approx. 14-18 kg | Reference value, may vary by manufacturer |
5.3 End Connection Details
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Welded Flange: Flange dimensions per ASME B16.5 Class 150, Raised Face sealing, flange to be welded to pipe
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Flange Type: Integral forged flange or welded flange
6. Test & Inspection (API 598)
| Test Item | Test Pressure | Medium | Acceptance Criteria |
|---|---|---|---|
| Shell Test | 2.4 MPa | Water | No visible leakage |
| High-Pressure Seat Test | 1.76 MPa | Water | No visible leakage |
| Low-Pressure Seat Test | 0.5 – 0.7 MPa | Air | No bubbles leakage |
| Test Duration | Per API 598 | — | Hold time conforms to standard |
7. Marking & Supply
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Valve Marking: Per MSS SP-25, nameplate to include nominal size, pressure class, material, heat number, design standard, etc.
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Flow Direction: Gate valve has no flow direction restriction
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Cleaning & Protection: Valves internally and externally cleaned, flange faces covered with protectors and coated with rust preventive
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Documentation: Material certificates, pressure test reports, declaration of conformity provided with shipment
