Product Description

The Pneumatic Soft Seal Lug Butterfly Valve combines the reliability of lug-style connection with the automation capabilities of pneumatic actuation. Designed for industrial process control, this valve features a resilient soft seat for bubble-tight shut-off and is ideal for applications requiring quick operation and precise flow control.

Key Features

• Pneumatic actuation– Fast response (3-15 seconds) with 0.4-0.6MPa air supply
• Bubble-tight sealing– EPDM/NBR/Viton soft seats achieve ANSI Class VI leakage
• Lug-style connection– Allows easy installation/removal without pipe disassembly
• Double eccentric design– Reduces seat wear and operating torque by 30%
• Corrosion-resistant– 304/316 stainless steel or epoxy-coated ductile iron construction
• Fail-safe options– Spring return (single/double acting) for emergency shut-off
• Position indicators– Visual open/close status with optional limit switches
• Manual override– Standard on most actuators for emergency operation
• IP65/IP67 protection– Suitable for harsh environments

Technical Specifications

Typical Applications

• Chemical Processing– Acid/alkali handling, solvent transfer
• Water Treatment– Potable water, wastewater, filtration systems
• HVAC– Chilled water, cooling towers, air handling units
• Power Generation– Cooling water, feedwater systems
• Food & Beverage– CIP systems, product transfer lines
• Pharmaceutical– WFI systems, clean utilities
• Pulp & Paper– Stock preparation, chemical dosing
• Mining– Slurry handling, process water

Operation Principle

The Pneumatic Soft Seal Lug Butterfly Valve operates through compressed air (typically 0.4-0.6MPa) acting on the pneumatic actuator’s piston or diaphragm. This rotational force is transmitted to the valve stem, causing a 90° rotation of the disc. In the open position, the disc is parallel to flow with minimal pressure drop. When closed, the disc rotates perpendicular to flow, with the resilient seat compressing against the disc edge for bubble-tight shutoff (ANSI Class VI). The lug-style design features threaded inserts for bolting between pipe flanges without requiring nuts on the downstream side.

Pneumatic Actuator Options

• Double Acting– Air required to open and close (no spring)
• Spring Return– Automatically returns to safe position on air failure
• Rack & Pinion– Compact design for smaller valves
• Scotch Yoke– Higher torque for larger valves