L&T SLIM SEAL BUTTERFLY VALVE– LEVER OPERATED

The L&T Slim Seal Butterfly Valve (Lever Operated) is a compact, quick-action wafer valve designed for manual isolation and step-throttling in low to medium-pressure piping networks. Manufactured by L&T Valves (formerly Audco India Limited), this valve features an ergonomically designed notch-plate lever mechanism that allows operators to achieve instant 90-degree quarter-turn shut-off or set precise intermediate flow positions.

Technical Specifications

• Design Type: Wafer-Type Slim Seal (Fits between ASME Class 120/150 / PN10 / PN16 flanges)
• Operation: Manual Notch-Plate Hand Lever with Position Lock Lever
• Size Range: 50 mm to 150 mm (2" to 6" NB standard for lever operation)
• Pressure Rating: PN10 and PN16
• Body Material: Cast Iron (IS 210 Gr. FG 220/260) or Ductile Iron / SG Iron (ASTM A536)
• Disc Material: SS304 (CF8), SS316 (CF8M), SG Iron with Nylon/Epoxy Coating, or Ductile Iron
• Liner / Seat Material: Integrally Molded / Vulcanized Nitrile (NBR), EPDM, or Viton (FKM)
• Stem / Shaft Material: SS410, SS316, or High-Tensile Carbon Steel
• Temperature Threshold: -10°C to +120°C (depending on elastomer seat selection)
• Design Standards: BS EN 593 / API 609 Category A / ISO 5211 Direct Mount Top Flange

Key Features & Operational Advantages

• Rapid Quarter-Turn Control: The ergonomic hand lever enables immediate full-open to full-close shut-off in a simple 90-degree sweep, making it ideal for fast isolation needs.
• Multi-Position Notch Plate: Built-in notched locking plate allows the valve disc to be locked into precise intermediate angles for simple flow throttling and balance control.
• Vulcanized Bonded Seat: Integrally molded rubber liner prevents seat deformation, reduces operating torque, and guarantees bi-directional 100% bubble-tight shut-off.
• Compact Wafer Profile: Ultra-slim face-to-face dimensions allow drop-in installation between pipeline flanges, drastically reducing space requirements and pipe stress.
• Maintenance-Free Shaft Sealing: Multi-layered stem seals and secondary O-rings prevent media ingress into the drive stem area, ensuring leak-free performance.

Primary Industrial Applications

• HVAC Systems: Chilled water distribution, condenser lines, and AHU coil balancing.
• Water Utilities: Potable water lines, pump discharge isolation, and filtration skid loops.
• Fire Protection: Sprinkler header pipes, fire hydrant bypasses, and pump room isolation.
• Light Industrial Utilities: Low-pressure compressed air, cooling tower loops, and effluent treatment systems.