L&T Butterfly Valve
Ultimate Technical Guide to L&T Butterfly Valves: Types, Specifications & Industrial Applications
For large-diameter flow control, space-constrained piping, and cost-effective fluid regulation, butterfly valves are the industry standard. L&T Butterfly Valves (manufactured by L&T Valves) deliver reliable bi-directional shut-off, low pressure drop, and extended service life across water treatment, power generation, and chemical process industries.
Major Design Variants
- Resilient-Seated Butterfly Valves: Feature a molded elastomer liner (EPDM, Nitrile, or Viton) bonded to the body to ensure zero-leakage isolation for water, air, and low-pressure utility lines.
- High-Performance Butterfly Valves (Double Offset): Designed with an eccentric shaft and disc arrangement that reduces seat wear, ideal for medium-pressure steam, hydrocarbons, and chemical media.
- Triple Offset Butterfly Valves (TOFV): Metal-to-metal seated valves engineered for zero-leakage bidirectionally under severe high-temperature and high-pressure duties where soft seats fail.
Technical Specifications Summary
|
Feature |
Specification Details |
|
Size Range |
2" to 96" (DN50 – DN2400) |
|
Pressure Ratings |
ASME Class 150, Class 300, and PN10 / PN16 |
|
Design Standards |
API 609, BS EN 593, ISO 10631, ASME B16.34 |
|
Testing Standards |
API 598, BS EN 12266-1 |
|
Body Styles |
Wafer, Lugged, and Double Flanged |
|
Temperature Envelope |
-29 °C to +400 °C (depending on seat material selection) |
|
Actuation Options |
Hand Lever, Worm Gearbox, Pneumatic Actuator, Electric Actuator |
Material Construction Options
- Body Metallurgies: Cast Iron (ASTM A126 Class B), Ductile Iron (ASTM A536), Carbon Steel (ASTM A216 WCB), Stainless Steel (ASTM A351 CF8M).
- Disc Materials: Ductile Iron (Nylon/Epoxy Coated), Stainless Steel 304 / 316, Aluminum Bronze.
- Seat Liners: EPDM, Buna-N (Nitrile), Viton (FKM), PTFE, and Metal-to-Metal (Stellite overlay).
- Stem Assembly: High-strength Stainless Steel (AISI 410 / 316 / 17-4PH) anti-blowout shaft design.
Key Engineering Advantages
- Compact & Lightweight Architecture: Requires significantly less installation space and structural support compared to bulky gate or globe valves.
- Low Pressure Drop: Streamlined disc profile maximizes flow coefficient (Cv) while keeping turbulence to a minimum.
- Replaceable & Bonded Liners: Resilient body liners isolate the valve body from process fluids, preventing internal body corrosion.
- Actuation-Ready Design: Standardized ISO 5211 top flanges allow direct mounting of quarter-turn pneumatic or motor actuators.
Primary Industrial Applications
- Water Infrastructure: Desalination skids, municipal water supply, cooling towers, and sewage treatment plants.
- Power & Utilities: Circulating water systems, condenser isolation, and auxiliary cooling networks.
- HVAC Systems: Chilled water lines, condenser water headers, and air handling equipment.
- Chemical & Process Industries: Low-pressure steam, slurry handling, and utility gas lines.
