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Series 30/31 Resilient Seated Butterfly Valve

Brand: Bray International, Inc
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The Bray Series 30 Wafer and Series 31 Lug style resilient seated butterfly valves feature a one-piece body with a high-strength through stem design utilizing an internal disc to stem connection.

The Series 30/31 is engineered to provide bidirectional bubble-tight shutoff and isolation of the line media from the stem or valve body.

Available with a wide selection of high-quality resilient seat & disc materials for a variety of applications, our Series 30/31 butterfly valves are easily automated for on-off or modulating service.
Features
  • Stem Retaining Assembly
    • The stem is retained in the body by means of a unique Stainless Steel Spirolox® retaining ring, a thrust washer and two C-rings, manufactured from brass as standard, stainless steel upon request. The retaining ring may be easily removed with a standard hand tool. The stem retaining assembly prevents unintentional removal of the stem during field service.
  • Stem Bushing - Non-corrosive, heavy duty acetal bushing absorbs actuator side thrust
  • Stem Seal
    • Double "U" cup seal design is self-adjusting and gives positive sealing in both directions.
  • Neck
    • Extended neck length allows for 2" of piping insulation and is easily accessible for mounting actuators
  • Disc
    • Casting is spherically machined and hand polished to provide a bubble-tight shutoff, minimum torque, and longer seat life
  • Body
    • One-piece wafer or lug style. Polyester coating for excellent corrosion resistance. Nylon 11 coating is available as an option
  • Primary & Secondary Seals
    • These seals prevent line media from coming in contact with the stem or body. Primary Seal is achieved by an interference fit of the molded seat flat with the disc hub. Secondary Seal is created because the stem diameter is greater than the diameter of the seat stem hole
  • Stem
    • Precision double "D" disc to stem connection drives the disc without the need for screws or pins. The close tolerance, double "D" connection that drives the valve disc is an exclusive feature of the Bray valve. Disassembly of the Bray stem is just a matter of pulling the stem out of the disc
  • Seat
    • Bray's tongue and groove seat design lowers torque and provides complete isolation of flowing media from the body. The seat also features a molded O-ring which eliminates the use of flange gaskets

Specifications

Brand

Size Range

  • 2” - 20” (DN 50 - 500)
  • 14”-20” (DN 350 - 500)

Temperature Range

  • -20° F to 400° F (-29° C to 204° C)

Maximum Allowable Operating Pressure

  • 175 psi (12 bar)
  • 150 psi (10 bar)

Shutoff Rating

  • Bidirectional Bubble-tight

Body Style

  • Wafer, Lug

Flange Drilling

  • ASME B16.1 Class 125, ASME B16.5 Class 150, EN 1092 PN 10, PN 16

Certifications

  • ABS, Bureau Veritas, CE/PED, CRN, DNV, FDA 21 CFR 177.1550, NSF 372, NSF-61

Face-to-Face

  • MSS SP-67, API 609, Category A, EN 558

Testing Standard

  • MSS SP-61, API 598, EN 12266-1

Design Standard

  • MSS SP-67, API 609, Category A

Disc Materials

  • Nylon 11 Coated Ductile Iron, Aluminum Bronze, Stainless Steel, Hastelloy, Halar Coated Ductile Iron

Seat Materials

  • BUNA-N, EPDM, FKM, Polyurethane

Stem Materials

  • Stainless Steel, Monel K500

Body Materials

  • Cast Iron, Ductile Iron, Carbon Steel, Aluminum

  • Potable Water
  • Wastewater
  • Seawater
  • HVAC

Documentation

Brochure

Manuals

Product Information

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