Engineered for precise flow regulation in extreme cryogenic environments, the BS 1873 LCB Low Temperature Steel Bevel Gear Globe Valve delivers uncompromising safety and effortless operation.
Manufactured from premium ASTM A352 LCB low temperature cast steel, this valve offers exceptional impact resistance and structural integrity at temperatures as low as -46°C. Designed strictly to BS 1873 standards, it features a robust extended bonnet construction that isolates the bevel gear mechanism from cryogenic media, preventing freezing and seal failure. Equipped with a high-torque bevel gear actuator for manual operation, this LCB globe valve ensures reliable throttling, zero-leakage shut-off, and seamless integration into critical LNG, industrial gas, and cryogenic chemical piping systems.
Key Features & Benefits
· BS 1873 Standard Compliance: Designed and manufactured strictly to BS 1873 specifications, ensuring dimensional compatibility, structural safety, and reliable performance in global cryogenic infrastructure.
· LCB Low Temperature Steel: Crafted from ASTM A352 LCB cast steel, providing superior low-temperature impact toughness and preventing brittle fracture in cryogenic service down to -46°C.
· Bevel Gear Torque Amplification: Features a bevel gear mechanism that reduces operating torque by over 60%, enabling effortless manual operation of large-diameter or high-pressure cryogenic valves without external power.
· Extended Bonnet Design: Isolates the bevel gear mechanism and stem packing from cryogenic media, preventing freezing, condensation, and seal failure in extreme low-temperature environments.
· Precise Throttling & Shut-off: The plug-shaped disc moves linearly along the valve seat, with the port change directly proportional to the disc stroke, making it ideal for both precise flow regulation and reliable isolation of cryogenic media.
· OS&Y Rising Stem Mechanism: Features an Outside Screw and Yoke design with a non-rotating rising stem, providing a clear visual indication of valve position and protecting stem threads from cryogenic media exposure.
Technical Specifications
Parameter | Specification |
Valve Type | Bevel Gear Globe Valve |
Design Standard | BS 1873 |
Body Material | Low Temperature Cast Steel (ASTM A352 LCB) |
End Connection | Flanged (RF/RTJ) per ASME B16.5 |
Pressure Rating | Class 150 - 600 (PN16 - PN100) |
Size Range | DN50 - DN300 (2" - 12") |
Temperature Range | -46°C to +200°C |
Trim Material | LCB / Stainless Steel / Stellite Hard-Faced |
Operation | Bevel Gear Manual |
Testing & Inspection | API 598 / BS 6755 |
Applications
This high-performance BS 1873 LCB bevel gear globe valve is widely deployed in:
· LNG & Industrial Gas: Flow control and isolation in liquefied natural gas, liquid oxygen, nitrogen, and argon storage and distribution systems.
· Cryogenic Chemical Processing: Handling cryogenic chemicals, refrigerants, and low-temperature fluids requiring precise manual throttling.
· Power Generation: Cryogenic fuel systems and auxiliary low-temperature utility lines requiring reliable manual control.
· Petrochemical Plants: Low-temperature separation units and cryogenic processing lines with manual operation needs.
· Cold Storage & Refrigeration: Industrial refrigeration systems and cold chain logistics requiring manual flow regulation.
FAQ
Q: What is LCB low temperature steel and why is it used?
A: LCB is the ASTM A352 standard casting grade for low temperature carbon steel. It offers excellent impact resistance at temperatures as low as -46°C, preventing brittle fracture and ensuring structural safety in LNG, industrial gas, and cryogenic chemical applications.
Q: Why choose a bevel gear for LCB cryogenic globe valves?
A: Bevel gears provide torque amplification, reducing operating force by over 60% compared to standard handwheels. This enables effortless manual operation of large-diameter or high-pressure cryogenic valves without external power, making it ideal for remote or hazardous areas where electric/pneumatic actuators are impractical.
Q: What is the purpose of an extended bonnet in LCB cryogenic valves?
A: An extended bonnet isolates the bevel gear mechanism and stem packing from cryogenic media, preventing freezing, condensation, and seal failure. It maintains the gear mechanism and packing at a safe temperature above the cryogenic fluid, ensuring reliable manual operation and preventing leaks in extreme low-temperature environments.
