L&T Forge Steel Gate Globe Valve
Ultimate Technical Guide to L&T Forged Steel Gate and Globe Valves: Specifications, Materials & Applications
For high-pressure, high-temperature small-bore piping, forged steel valves provide the structural integrity and grain refinement required to handle mechanical stress and thermal fatigue. L&T Forged Steel Gate and Globe Valves (manufactured by L&T Valves) feature an outside screw and yoke (OS&Y) design with bolted or welded bonnets, engineered for tight shut-off and precise throttling across compact process pipelines.
Technical Specifications Summary
|
Feature |
Gate Valve Specification |
Globe Valve Specification |
|
Size Range |
½" to 2" (DN15 – DN50) |
½" to 2" (DN15 – DN50) |
|
Pressure Ratings |
ASME Class 150, 300, 600, 800, and 1500 |
ASME Class 150, 300, 600, 800, and 1500 |
|
Design Standards |
API 602, ISO 15761, ASME B16.34 |
BS 5352, ISO 15761, API 602, ASME B16.34 |
|
Testing Standard |
API 598 (Hydrostatic & Pneumatic) |
API 598 (Hydrostatic & Pneumatic) |
|
Bonnet Construction |
Bolted Bonnet (Standard) / Welded Bonnet (Critical Service) |
Bolted Bonnet (Standard) / Welded Bonnet (Critical Service) |
|
End Connections |
Socket Weld (ASME B16.11), Screwed NPT (ASME B1.20.1), Flanged (ASME B16.5) |
Socket Weld (ASME B16.11), Screwed NPT (ASME B1.20.1), Flanged (ASME B16.5) |
Material Construction & Trim Options
- Forged Carbon Steel: ASTM A105 / A105N (standard high-pressure service).
- Forged Stainless Steel: ASTM A182 Grade F316 / F316L / F304 / F304L.
- Forged Alloy Steel: ASTM A182 Grade F11, F22, F91 (for elevated temperature steam service).
- Trim Seating Options: API Trim 8 (13% Cr + Stellite 6) and API Trim 5 (Full Stellite 6) hardfaced seats to resist high-velocity erosion and galling.
- Stem Sealing & Packing: Die-formed flexible graphite rings with braided anti-extrusion end rings for emissions control.
Key Engineering Advantages
- High Structural Integrity: Forged body construction eliminates internal casting defects (porosity, shrink holes), offering high resistance to pipe vibration and pressure shock.
- Backseat Sealing: Machined integral backseat allows gland packing pressure relief when the valve is fully open.
- Heavy-Duty OS&Y Yoke: Protects stem threads from process line fluids and high ambient temperatures.
- Precise Throttling (Globe Design): Tapered disc and renewable hardfaced seat enable tight flow regulation and zero seat erosion under high differential pressures.
Primary Industrial Applications
- Thermal Power Plants: High-pressure drain lines, vent valves, gauge isolation, and boiler auxiliary piping.
- Refining & Petrochemical: Hydrocarbon sampling loops, chemical injection skids, and hydrogen service lines.
- Oil & Gas Offshore Platforms: High-pressure manifold lines, instrument takeoff points, and utility headers.
