L&T Cast Steel Check Valve
Ultimate Technical Guide to L&T Cast Steel Check Valves: Specifications, Design Features & Applications
In high-pressure piping systems and process facilities, preventing backflow is critical to protecting pumps, compressors, and rotating equipment. L&T Cast Steel Check Valves (manufactured by L&T Valves) serve as dependable non-return valves (NRVs), offering automatic, fast-acting protection against fluid reversal, water hammer, and pipeline surge.
Technical Specifications Summary
|
Feature |
Specification Details |
|
Size Range |
2" to 48" (DN50 – DN1200) |
|
Pressure Ratings |
ASME Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500 |
|
Design Standards |
BS 1868, API 6D, ASME B16.34 |
|
Testing Standards |
API 598, BS EN 12266-1 |
|
Face-to-Face Standard |
ASME B16.10 |
|
End Connections |
Flanged Ends (ASME B16.5 / ASME B16.47) and Butt Weld Ends (ASME B16.25) |
|
Cover Construction |
Bolted Cover (Standard) / Pressure Seal Cover (High-Pressure Service) |
Material Construction & Trim Options
- Cast Carbon Steel: ASTM A216 Grade WCB / WCC (for general hydrocarbon and utility services).
- Cast Alloy Steel: ASTM A217 Grade WC6, WC9, C12A (engineered for high-temperature superheated steam).
- Cast Stainless Steel: ASTM A351 Grade CF8, CF8M, CF3, CF3M.
- Disc & Hinge Assembly: Cast steel or stainless steel disc with internal hinge pin design to eliminate external body penetrations and fugitive emission leaks.
- Hardfacing & Seat Rings: Renewable or integral body seats overlaid with Cobalt-Chromium alloy (Stellite 6) to resist wire-drawing and high-velocity seating impact.
Key Engineering Advantages
- Low Pressure Drop: The contoured body cavity and full-way bore provide an unobstructed flow passage, drastically reducing head loss across the valve.
- Inline Maintenance: The bolted cover architecture allows technicians to inspect, service, or resurface the seat ring and disc assembly without removing the valve body from the pipeline.
- Reliable Shut-Off: The gravity-assisted swinging disc responds immediately to flow deceleration, creating a tight seal against the body seat before flow reversal can occur.
- Zero Leak-Path Hinge Pin: Internal hinge pin mounting eliminates external side plug holes, removing potential external leak paths and ensuring low fugitive emissions.
Primary Industrial Applications
- Oil Refineries & Petrochemical Plants: Pump discharge lines, hydrocarbon transfer manifolds, and cracker bypass networks.
- Power Generation Facilities: Boiler feed pump protection, turbine extraction lines, and condenser cooling loops.
- Chemical Processing: Utility header protection, solvent line backflow prevention, and acid circulation systems.
- Water & Desalination Infrastructure: High-pressure water supply pumps, transmission mains, and reverse osmosis skids.
