Series 51-53 Large Diameter Resilient Seated Butterfly Valve

Large diameter resilient seated butterfly valve in wafer (Series 51) or U section wafer (Series 53, lugs drilled not tapped) pattern, sized 26" to 40" (DN 650 to 1000) and rated 150 PSIG (PN 10). A heavy duty, one-piece epoxy coated body carries a Center-LOK® peroxide cured seat, and bronze sleeve, bushing and vertical thrust bearings cut friction, absorb actuator side thrust and stop the disc dropping under the weight of stem and disc.

Body style

Series 51: Wafer; Series 53: U Section Wafer (lugs drilled not tapped)

Body

CI, DI, CS

Disc

Nylon Ductile Iron (NDI), Aroxy Ductile Iron (ADI), CF8M

Stem

410 SS, 316 SS, CS BS 970

Seat

EPDM, Buna-N, FKM, Silicone

Size range

26" to 40" (DN 650 to 1000)

Pressure rating

150 PSIG (PN 10)

Design standard

API 609, BS EN 593

Testing standard

API 598, BS EN 12266-1

Features

ISO 5211 top plate for direct mounting of a wide range of actuators, handles, and gears; heavy duty bronze sleeve bearing reduces friction and torque; high strength disc with hand polished disc edge and hubs; thick bronze bushing absorbs actuator side thrusts; bronze vertical thrust bearing eliminates disc displacement due to weight of stem and disc; blowout proof stem retention offers easy assembly and disassembly; bi-directional U-cup stem seal; heavy duty, one-piece epoxy coated body; Center-LOK® peroxide cured seat; double moulded O-rings provide upper and lower secondary seals