Forged Metal Seated Butterfly Valve

Size: 2" - 12" (DN50 - DN300)

Pressure: Class 150 - 900 (PN 10 - 150)

Standard: ASME B16.34, API 609, ISO 15848, API 607 (fire-safe)

Body Materials: A182 F316 (forged), A182 F51/F53 (forged Duplex/Super Duplex), A182 F5/F9/F11/F22 (forged Cr-Mo), A182 F304 (forged)

Seat: Metal-to-metal (Stellite 6 or tungsten carbide overlay on seat ring and disc sealing edge)

Design: Forged body construction, triple eccentric or double eccentric geometry

Cast bodies work fine at Class 150-300. Wall thickness is generous, porosity gets caught in radiography, pressure holds. Push past Class 600 into 900 territory on a 4" or 6" valve, and the math changes. Casting porosity—microscopic voids from solidification—becomes a failure initiation point under sustained high-pressure loading. The wall is thin relative to the pressure it carries. A void in a thin wall at 1500 PSI isn't cosmetic. It's a crack waiting to start.

Forging eliminates that risk. A forged A182 F316 or F51 body has uniform grain structure through every section of the pressure boundary. No voids. No hidden porosity. Every square millimeter has the same tensile strength, same yield point, same ductility. ASME B16.34 allows forged bodies higher pressure ratings with confidence because material integrity is predictable.

The tradeoff: forging costs scale with size. A forged 12" body is expensive but manufacturable. Above 12", forging becomes prohibitive and wall thickness increases enough to manage casting porosity through RT inspection. That's why this product stops at 12"—economics make casting rational above that size.

Hard Seats That Don't Wear Out

Stellite 6 overlay on the seat ring. Tungsten carbide on the disc sealing edge. Two hard surfaces cycling against each other every operation. Metal-to-metal seating sounds like it should wear fast—it doesn't, because eccentric geometry lifts the disc off the seat immediately during opening. No sliding contact. No gouging. After 10,000 cycles, the seat still holds. After 50,000, wear is still within tolerance. Slurry lines, catalyst recovery, abrasive streams that destroy elastomer seats in weeks—these surfaces take the punishment and keep sealing.

Duplex for Corrosive Service

A182 F51 and F53 forged bodies handle chloride environments that eat standard stainless. Offshore seawater injection. Desalination brine. Process streams where 316L pits within months. Duplex forged bodies give corrosion resistance plus pressure boundary integrity in one spec. No casting with supplemental NDE requirements—the forging is clean by definition.

A: Radiography catches visible porosity, not microscopic voids. At Class 900 on a thin-wall small body, a void too small for RT can still initiate a fatigue crack under cyclic loading. Forging removes that uncertainty.

A: A182 F22 forged bodies rate for sustained service up to approximately 1050°F per ASME B16.34. F5 and F9 cover lower ranges in the Cr-Mo family.

A: The seat ring is replaceable. The disc overlay is not field-repairable—Stellite and tungsten carbide require controlled shop environments for reapplication. Plan spares for critical service.

A: Forging above 12" becomes economically impractical. Press requirements, material volume, and machining costs exceed market acceptance. Larger sizes use casting with proper NDE—increased wall thickness accommodates porosity management.