Ductile Cast Iron Wafer Style Quarter-Turn Butterfly Valve

The Ductile Cast Iron Wafer Style Quarter-Turn Butterfly Valve delivers exceptional flow control in pipelines, combining high-strength ductile iron body construction with a compact wafer design that fits between flanges to save space and reduce weight. Our valve family includes the widely specified Resilient Seat Ductile Iron Wafer Butterfly Valve With Hand Handle, which provides bubble-tight shutoff and smooth quarter-turn operation for HVAC, water treatment, irrigation, and general industrial services. The ductile iron body meets ASTM A536 Grade 65-45-12, offering tensile and yield strengths far superior to gray iron while maintaining excellent machinability and impact resistance. A 90-degree rotation of the handle or gear operator fully opens or closes the valve, minimizing actuation time and allowing fast isolation. The bonded resilient seat wraps around the disc hub and body, providing a full 360° sealing surface without requiring flange gaskets. Available with hand lever, gear operator, or pneumatic/electric actuation, this wafer butterfly valve series accommodates both manual and automated systems with the same core design.

The Ductile Cast Iron Wafer Style Quarter-Turn Butterfly Valve is engineered for sustained performance under demanding conditions. Its precision-machined disc seat area mates with the resilient seat to achieve zero-leakage tightness per API 598, while the stainless steel stem (420 or 316) with blowout-proof design and anti-static grounding ensures operational safety. The wafer pattern eliminates the need for extra support beyond the mating flanges, simplifying installation and reducing piping loads. A full-lug variant is also available for dead-end service or downstream removal without disturbing the upstream piping. Standard bidirectional sealing and the ability to mount in any orientation provide layout flexibility. The ductile cast iron body withstands higher pressure surges than conventional cast iron alternatives, making this valve suitable for throttling applications and moderate temperature ranges typically from -20°F to 250°F depending on the resilient material selected.

Key Product Parameters

• Body Material: Ductile Cast Iron ASTM A536 Gr. 65-45-12
• Disc Material: Ductile Iron with Electroless Nickel Plating / Stainless Steel CF8M / Aluminum Bronze (optional)
• Seat Material: EPDM, NBR, or PTFE-encapsulated EPDM for specific media compatibility
• Stem Material: ASTM A276 SS420 or SS316, one-piece or two-piece blowout-proof design
• Operation Type: Lever Handle (up to DN150), Gear Operator (DN200 and larger), Pneumatic or Electric Actuator ready
• Pressure Rating: 150 PSI (10 bar) cold working pressure for most sizes; higher ratings available upon request
• Connection Standard: Wafer type, fits between ANSI 125/150, DIN PN10/16, JIS 10K flanges
• Design Standard: API 609 Category A, MSS SP-67, EN 593
• Face-to-Face: ISO 5752 Series 20, API 609 wafer short pattern

Dimensional and Pressure Table

Note: Weights are approximate and vary with options. Custom sizes and pressure classes are available upon request.

Additional Technical Highlights

• Bidirectional bubble-tight sealing per API 598 zero-leakage standard
• Molded-in seat with vulcanized bonding eliminates cold flow and seat displacement
• Integrated ISO 5211 actuator mounting pad on top flange for direct automation
• Blowout-proof stem with external anti-static spring for fire-safe applications
• Corrosion-resistant epoxy coating on body and disc (standard RAL 5021 blue) with optional NACE coatings
• Low operating torque reduces actuator size and manual effort; lever lockable in 10° increments
• Suitable for water, wastewater, HVAC chilled/hot water, compressed air, oils, and many chemicals (consult chemical compatibility for seat selection)

The robust nature of ductile iron combined with a resilient-seated wafer configuration makes this valve a versatile choice for modern piping networks. Each unit undergoes shell and seat testing per API 598 to ensure reliability before shipment. With a wide range of actuation accessories—including limit switch boxes, solenoid valves, and positioners—the Ductile Cast Iron Wafer Style Quarter-Turn Butterfly Valve can be fully integrated into automated control loops.