BS 1873 is an industrial valve standard developed by the British Standards Institution (BSI), which specifically regulates the design, materials and manufacturing requirements of steel stop valves and stop check valves in the petroleum, petrochemical and related industries. The following is an analysis of the core content of the standard:
1. Standard positioning and version
First release: 1975 (BS 1873:1975), confirmed and revised in 1983.
Applicable objects: Covers straight, angle and oblique Y-type stop valves and stop check valves connected with flange ends and butt welding ends.
2. Core parameter range
Nominal size: 15mm to 400mm (1/2 inch to 16 inches).
Pressure level: Covers 150 to 2500 pounds (Class 150~2500).
Temperature range: Depending on the material difference, it can be adapted to high temperature conditions up to 550℃.
3. Key technical requirements
Structural design
Valve body flow channel: Including straight-through, angle and oblique Y-type structures to reduce flow resistance and optimize the medium flow path.
Sealing system: Requires double sealing of soft sealing ring and metal valve seat, and passes 2000 opening and closing cycle tests without damage in a dry environment.
Material specification
Shell material: The valve body and valve cover must be made of BS 1501-1506 or BS 1560 standard steel, and the carbon content of carbon steel is limited to ≤0.25%.
Sealing component: The valve seat material is not lower than the shell material standard, and the gasket must comply with the metal winding or steel gasket specified in BS 3381.
Testing and certification
Performance test: Water pressure and air pressure tests are carried out in accordance with BS 6755 and API Std 598, and the leakage rate must be less than 10^-6 mL/s.
Manufacturing requirements: The valve must be marked with pressure rating, flow arrow and material code to ensure traceability.
4. Typical application areas Energy industry: Valve selection for high-pressure steam pipelines and gas transmission and distribution systems.
Chemical plant: Flow control and emergency shut-off of corrosive media (such as acid and alkali solutions).
Nuclear power engineering: Adapt to high temperature and high pressure environments, and must meet the special working conditions of BS 1873 and ASME specifications at the same time.
Summary: BS 1873 provides high-reliability valve standards for high-risk industrial scenarios such as petroleum and chemical industries through strict material specifications, sealing design and testing requirements, and is an important technical basis for European and international engineering projects.
