L&T SLIM SEAL BUTTERFLY VALVE– GEAR OPERATED

The L&T Slim Seal Butterfly Valve (Gear Operated) is a premier wafer-type manual isolation and flow-regulation valve engineered for high-volume liquid and gas distribution networks. Manufactured by L&T Valves (formerly Audco India Limited), this compact butterfly valve features a heavy-duty worm gearbox and handwheel assembly. The mechanical gear system multiplies input torque, enabling smooth, effortless quarter-turn operation and precise throttling on high-pressure and large-diameter pipelines.

Technical Specifications

• Design Type: Wafer-Type Slim Seal (Squeezed between ASME Class 120/150 / PN10 / PN16 flanges)
• Operation: Manual Worm-Gearbox with Handwheel and Mechanical Position Indicator
• Size Range: 50 mm to 600 mm (2" to 24" NB)
• Pressure Rating: PN10, PN16, and Class 150
• 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 Coated, 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 / ISO 5211 (Top Flange for Actuation)

Key Features & Operational Advantages

• Effortless Mechanical Advantage: The totally enclosed worm gear drive reduces operator torque requirements, preventing water hammer and enabling fine-tuned throttling.
• Molded Vulcanized Elastomer Liner: The rubber liner is permanently bonded to the body, eliminating seat distortion, reducing disc drag, and guaranteeing 100% bi-directional bubble-tight shut-off.
• Space-Saving Wafer Design: Ultra-compact face-to-face dimensions allow quick drop-in installation between pipe flanges without extra support structures.
• Triple Shaft Sealing System: Primary seat seal combined with secondary O-rings prevents line media from entering the shaft bearing area or leaking into the atmosphere.

Primary Industrial Applications

• Water & Wastewater Treatment: Raw water intake, RO desalination plants, sewage lines, and municipal distribution loops.
• HVAC & Building Services: Chilled water circulation, condenser water lines, and cooling tower isolation.
• Firefighting Networks: Main fire ring mains, hydrant lines, and sprinkler header isolation.
• Process Industries: Paper & pulp, sugar mills, power plants, and utility air/gas lines.