Valve Standard Reference
BS 1873
BritishSteel Globe and Globe Stop and Check Valves (Flanged and Butt-Welding Ends) for the Petroleum, Petrochemical and Allied Industries
BS 1873 is the British Standard for steel globe valves and globe stop-and-check valves with flanged and butt-welding ends, covering petroleum, petrochemical, and allied industries.
Overview — BS 1873
BS 1873 is the British Standard for steel globe valves and globe stop-and-check valves with flanged and butt-welding ends, covering petroleum, petrochemical, and allied industries. It is the UK/European counterpart to API 623 and specifies design, material, dimensional, testing, and marking requirements for globe valves intended for process plant service, including North Sea offshore platforms and UK refineries. BS 1873 globe stop-and-check valves are particularly valued for steam turbine bypass and boiler feed service where flow direction reversal can occur.
Scope
Covers carbon steel and alloy steel globe valves and globe stop-and-check valves in flanged (ASME B16.5 or EN 1092-1) and butt-welding (ASME B16.25) end configurations. Size range NPS ½" through NPS 24", pressure classes ASME 150 through 2500 or PN 16 through PN 400. Intended for petroleum, petrochemical, gas processing, and power generation applications.
Applicable Valve Types
Globe Valves — straight and angle pattern
Globe Stop-and-Check Valves
Applicable Pressure Classes
Key Requirements — BS 1873
Body and bonnet pressure ratings per ASME B16.34 P-T tables for the material
OS&Y (outside screw and yoke) rising stem standard for all sizes NPS 2" and above
Globe stop-and-check variant: disc guided to prevent disc spin; able to function as check valve when handwheel is released
Trim materials: Stellite-faced disc and seat ring for high-pressure-drop and erosive service
Backseat provision standard in BS 1873 for in-service packing maintenance
Fire-tested variants available per BS 6755 Part 2 / ISO 10497
Bolted bonnet with full-face or spiral-wound gasket per service temperature class
PMI (positive material identification) of body and bonnet castings
Testing Requirements — BS 1873
Shell test: 1.5× rated pressure, minimum 15 minutes, zero leakage
Seat leakage test: 1.1× rated pressure, acceptance per API 598 or ISO 5208
Backseat test: 1.1× rated pressure when backseat is provided
Documentation Required for BS 1873 Compliance
BS 1873 compliance certificate
Shell and seat pressure test certificates
Material Test Reports (MTR) per EN 10204 3.1
PMI report for alloy and stainless steel valves
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