Product Overview

The Pneumatic Wafer Type Butterfly Valve is a compact, lightweight flow control device designed for industrial applications requiring quick operation and reliable performance. Featuring a wafer-style design and pneumatic actuation, this valve offers excellent shut-off capabilities with minimal pressure drop. The quarter-turn operation provides rapid opening and closing, making it ideal for automated process control systems across various industries.

Key Features

• Compact Wafer Design– Lightweight construction with minimal space requirements
• Quick Operation– 90° rotation provides fast opening/closing (typically 2-5 seconds)
• Low Pressure Drop– Streamlined disc design minimizes flow resistance
• Bubble-Tight Shutoff– Resilient seat ensures ANSI Class VI leakage standards
• Corrosion Resistance– Available in various materials including stainless steel
• Easy Installation– Fits between standard pipe flanges without special hardware
• Fail-Safe Options– Spring-return actuators available for critical applications
• Low Maintenance– Simple design with minimal wearing parts

Technical Specifications

Working Principle

The pneumatic wafer butterfly valve operates through a quarter-turn rotational motion. When the pneumatic actuator receives a control signal, it rotates the valve stem and attached disc by 90 degrees. In the open position, the disc is parallel to the flow, offering minimal resistance. When closed, the disc rotates perpendicular to the flow, creating a tight seal against the valve seat.

The wafer design is installed between pipe flanges using through-bolts, making it more compact and lighter than flanged-end valves. The actuator can be configured for either double-acting (air to open, air to close) or spring-return (automatically returns to safe position on air failure) operation.

Structural Features

• Wafer Body Design– Compact construction that fits between standard flanges
• Eccentric Disc– Offset shaft design reduces wear and improves sealing
• Resilient Seat– Provides bubble-tight shutoff (ANSI Class VI)
• Stem Seal System– Multiple sealing points prevent leakage along the stem
• Corrosion Protection– Optional coatings for harsh environments
• Low Torque Operation– Balanced disc design reduces actuator requirements

Typical Applications

• Water Treatment– Filtration and distribution systems
• Chemical Processing– Handling corrosive media
• HVAC Systems– Air and water control
• Food & Beverage– Sanitary process applications
• Pharmaceutical– CIP processes
• Industrial Water– Cooling and process systems
• Pneumatic Conveying– Material handling systems

Installation Requirements

• Install between properly aligned pipe flanges
• Use gaskets suitable for the media and temperature
• Ensure proper actuator orientation for accessibility
• Verify flow direction matches valve body marking
• Do not use valve to compensate for pipe misalignment
• Follow proper bolt tightening sequence and torque specifications

Maintenance Guide

Routine Maintenance

• Monthly visual inspection for leaks and proper operation
• Quarterly lubrication of stem (if applicable)
• Annual seat and seal inspection
• Biannual actuator performance check

Troubleshooting

• Leakage– Check seat condition and stem seals
• Stiff Operation– Inspect for debris or insufficient air supply
• Incomplete Closure– Verify actuator stroke adjustment
• Air Leaks– Check actuator diaphragm and fittings

Ordering Information

When ordering, please specify:

1. Valve size (DN or inches)
2. Pressure rating (PN or Class)
3. Body material
4. Seat material
5. Actuator type (double-acting or spring-return)
6. Fail-safe position (open/closed for spring-return)
7. Control signal type (if required)
8. Special requirements (sanitary, fire-safe, etc.)