Quick Answer
BS 1873 is the British Standard for flanged steel globe valves for the petroleum, petrochemical, and allied industries. It defines pressure-temperature ratings, face-to-face dimensions, materials, and testing for globe valves in sizes typically NPS 1/2 to 24. Note that BS 1873 has been superseded in Europe by EN 13709, but many international projects still reference the older standard.
What BS 1873 Covers
BS 1873 (Flanged steel globe valves — PN 16, 25, 40, 64 and Class 150, 300, 600) specifies:
- Ratings: both PN and Class pressure-temperature systems
- Face-to-face dimensions: per ASME B16.10 or ISO 5752
- End connections: flanged (ASME B16.5 or EN 1092)
- Materials: cast carbon and alloy steels
- Testing: hydrostatic shell and seat tests
Key Requirements
| Item | Typical Requirement |
|---|---|
| Size range | NPS 1/2 to 24 |
| Pressure classes | Class 150, 300, 600 (PN 16-64) |
| Trim | 13% Cr stainless steel standard |
| Bonnet | Bolted or welded |
| Testing | Shell and seat per API 598 / ISO 5208 |
Why It Still Matters
Even though BS 1873 is officially withdrawn in favor of EN 13709, it appears in legacy specifications, overseas project documentation, and tender documents worldwide. Suppliers and buyers still need to interpret BS 1873 trim codes, testing classes, and dimension tables when maintaining or replacing existing installed globe valves.
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Troubleshooting Checklist for BS 1873 Globe Valves
- Leaking at the stem: tighten the gland evenly, or replace packing
- Valve passes in closed position: inspect and lap the seat, check the disc
- Flange joint leak: re-torque studs to the correct value in a crisscross pattern
- Hard handwheel operation: clean and lubricate the stem threads
- Before any work: isolate, depressurize, and lock out the line
Frequently Asked Questions
Is BS 1873 still valid?
BS 1873 was superseded by EN 13709 in Europe, but it remains referenced in many international and legacy specifications. Check the project standard for which one applies.
What is the difference between BS 1873 and API 602?
BS 1873 covers flanged globe valves up to larger sizes (NPS 24). API 602 covers compact steel gate, globe, and check valves only up to NPS 4.
What trim material is standard in BS 1873 globe valves?
The standard trim is 13% chromium stainless steel, with optional hard-facing (Stellite) for erosion resistance in throttling service.
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Disclaimer: This article is provided for general educational and informational purposes only and does not constitute professional engineering advice. Valve applications vary with pressure, temperature, media, and applicable codes. Always verify specifications against the manufacturer’s data sheet and consult a qualified engineer before selecting, installing, or repairing any valve. Valve Knowledge Hub makes no warranties about the accuracy or completeness of the information on this site and assumes no liability for any use of it.