Product Description

The Pneumatic Soft Seal Wafer Butterfly Valve is an industrial-grade flow control device that combines the compact wafer-style design with reliable pneumatic actuation. Featuring a resilient soft seat for bubble-tight shut-off, this valve is ideal for automated systems requiring quick operation and precise flow regulation.

Key Features

• Pneumatic actuation– Fast response (3-15 seconds) with 0.4-0.6MPa air supply
• Bubble-tight sealing– EPDM/NBR/FKM soft seats achieve ANSI Class VI leakage
• Wafer-style connection– Compact design with minimal installation space requirements
• Double eccentric design– Reduces seat wear by 40% and operating torque by 30%
• Corrosion-resistant construction– 304/316 stainless steel or epoxy-coated ductile iron
• Fail-safe options– Spring return (single/double acting) for emergency shut-off
• Visual position indicators– Clear open/close status with optional limit switches
• Manual override– Standard emergency handwheel for power failure situations
• IP65/IP67 protection– Suitable for outdoor and harsh environments

Technical Specifications

Typical Applications

• Chemical Processing– Acid/alkali handling, solvent transfer systems
• Water Treatment– Potable water distribution, wastewater management
• HVAC Systems– Chilled water circuits, cooling tower controls
• Power Generation– Cooling water systems, feedwater control
• Food & Beverage– CIP systems, hygienic product transfer lines
• Pharmaceutical– WFI distribution, clean utility systems
• Pulp & Paper– Stock preparation, chemical dosing control
• Mining Operations– Slurry handling, process water management

Operation Principle

The Pneumatic Soft Seal Wafer Butterfly Valve operates through compressed air (typically 0.4-0.6MPa) acting on the pneumatic actuator’s piston or diaphragm mechanism. This generates rotational torque that is transmitted to the valve stem, causing the disc to rotate 90° between open and closed positions. In the fully open state, the disc aligns parallel to the flow direction, offering minimal flow resistance. When closed, the disc rotates perpendicular to the flow path, with the resilient seat material compressing against the disc periphery to achieve bubble-tight shutoff (ANSI Class VI standard). The wafer-style design is installed between pipeline flanges using through-bolts, eliminating the need for valve-end nuts.

Actuator Configuration Options

• Double Acting– Requires air pressure for both opening and closing actions
• Spring Return (Single Acting)– Automatically returns to safe position on air failure (normally open or normally closed)
• Rack & Pinion Design– Compact mechanism ideal for valves up to DN300
• Scotch Yoke Mechanism– Higher torque output for larger valves (DN350-DN600)
• Proportional Control– Optional for precise flow modulation applications