L&T Cast Steel Gate Valve
Ultimate Technical Guide to L&T Cast Steel Gate Valves: Specifications, Features & Applications
In major industrial pipelines, achieving reliable full-bore fluid isolation without pressure drop is critical for process safety and pipeline efficiency. L&T Cast Steel Gate Valves (manufactured by L&T Valves) serve as the benchmark for heavy-duty on/off isolation, providing linear shut-off capabilities across thermal power plants, oil refineries, and chemical processing facilities.
Technical Specifications Summary
|
Feature |
Specification Details |
|
Size Range |
2" to 72" (DN50 – DN1800) |
|
Pressure Ratings |
ASME Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500 |
|
Design Standards |
API 600, ISO 10434, 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) |
|
Bonnet Design |
Outside Screw and Yoke (OS&Y) with Bolted Bonnet construction |
Material Construction & Trim Options
- Cast Carbon Steel: ASTM A216 Grade WCB / WCC (standard process 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.
- Flexible Wedge: Engineered with a central groove to allow independent seating surfaces to flex under pipeline thermal stress, preventing thermal binding.
- Hardfacing & Seat Rings: Renewable or integral seat rings hardfaced with Cobalt-Chromium alloy (Stellite 6) to resist erosion, pitting, and galling under high differential pressures.
Key Engineering Advantages
- Zero Pressure Drop: Full-bore design matches pipe internal diameter, ensuring unobstructed straight-through flow with minimal friction losses.
- Thermal Binding Prevention: The flexible wedge construction absorbs piping expansion and contraction caused by rapid temperature fluctuations.
- Integral Backseat Feature: Provides a secondary seal when fully open, allowing the stuffing box to be isolated for maintenance under pressure.
- External Stem Threads: OS&Y rising stem structure keeps stem threads isolated from aggressive fluid media and elevated process temperatures.
Primary Industrial Applications
- Petroleum Refining: Hydrocracker isolation, crude distillation units, tank farm manifolds, and hydrocarbon storage headers.
- Power Generation: Main steam headers, boiler feed water lines, condenser isolation, and auxiliary cooling networks.
- Petrochemical Processing: Ethylene plants, solvent lines, and chemical reactor loops.
- Water & Utilities: High-pressure water transmission mains, desalination systems, and utility distribution manifolds.
