Resilient Seat Ductile Iron Wafer Butterfly Valve With Hand Handle

Engineers and facility managers frequently prioritize valves that deliver long-term reliability without compromising flow efficiency. The Ductile Cast Iron Wafer Style Quarter-Turn Butterfly Valve family has long served as a cost-effective workhorse for general-purpose throttling and isolation. Our Resilient Seat Ductile Iron Wafer Butterfly Valve With Hand Handle elevates that proven platform by integrating a fully bonded resilient liner that isolates the disc and stem from the media stream. This design eliminates metal-to-metal contact inside the passage, prevents corrosion at the sealing face, and maintains a bubble-tight shutoff up to the full rated working pressure. The compact wafer body slips directly between ANSI 125/150 flanges, reducing installation time and eliminating the need for heavy hoisting equipment in congested pipe galleries.

The is engineered for repetitive manual operation, with a fatigue-resistant ductile iron body that withstands abrupt pressure spikes commonly found in municipal water supply and HVAC chilled-water loops. The hand handle incorporates a multi-position notched plate that allows quick quarter-turn opening or closing, plus a memory stop for repeatable throttling settings. Because the seat wraps around the face and into the body bore, gaskets are unnecessary—the valve’s own liner creates a leak-proof flange seal. This self-gasketing feature dramatically simplifies piping alignment and reduces the number of consumables required on site. The shaft is fitted with a maintenance-free bushing and an anti-blowout shoulder, so the stem remains secure even if the handle is removed during system commissioning.

Construction and Material Highlights

• Body: Investment-quality ductile iron per ASTM A536, Grade 65-45-12, with fusion-bonded epoxy coating inside and out (min. 250 microns) for underground burial service
• Disc: Ductile iron core fully encapsulated in the same elastomer as the seat, or available in electroless nickel-plated ductile iron for abrasive media
• Seat/Liner: Precision-moulded EPDM (standard), NBR for oil resistance, or FKM for elevated chemical compatibility; bonded directly to the body without retaining rings
• Stem: Two-piece split-shaft design in 416 stainless steel, top-flatted for handle engagement, with PTFE-impregnated secondary seal ring
• Handle: Gear-type hand handle constructed of zinc-plated steel with a thermoplastic gripper; includes lockout hole for safety padlocks in compliance with OSHA lockout/tagout protocol
• Flange compatibility: Mounts between ASME B16.5 Class 150 flat or raised-face flanges without flange adaptors
• Pressure/temperature envelope: Allows full-rated 250 psi (17.2 bar) cold working pressure up to 50 ℃ (122 ℉) for the EPDM seat variant

Dimensional and Flow Data

The valve is factory-tested in accordance with API 598 at 1.1 times the nominal pressure for seat leakage and 1.5 times for shell integrity. Every unit ships with a protective cardboard cover over the disc lip and a plastic cap on the stem top to prevent contamination during storage and transit. Operators can specify micro-switch limit switches or a gear operator retrofitted to the same mounting flange without replacing the wafer body.