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Instantly add the Series 20/21 Resilient Seated Butterfly Valve and 50,000+ more product series to your store or catalog  
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Series 20/21 Resilient Seated Butterfly Valve

Brand: Bray International, Inc
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The Series 20/21 resilient seated butterfly valve surpasses the high standards required in sanitary valve applications, and inherent flow characteristics and capabilities.

Bray's Series 20 valve is a wafer version with flange locating holes, and the Series 21 is the companion lug version for dead-end service and other flange requirements.
Features
  • Stem Seal
    • Double "U" cup seal design is self-adjusting and gives positive sealing in both directions and prevents external substances from entering the stem bore
  • Disc/Stem
    • One-piece design. The disc edge is spherically machined and hand polished to produce a bubble-tight shutoff, minimum torque, and longer seat life. The disc/stem design inherently provides complete protection from particle entrapment and bacterial decay, protection that is required for sanitary performance. For superior erosion and abrasion resistance, the one-piece disc/stem is fully encased in either EPDM or BUNA-N. The thin disc profile provides a much higher Cv (up to 50% greater than most through-stem designs) and greater pressure recovery, thus resulting in lower pressure drops and a more energy-efficient valve
  • Body
    • Two-piece wafer or lug style allows for ease of assembly and maintenance. Nylon 11 coating for excellent corrosion resistance is standard for 1"-8" valves and available on larger sizes upon request. Polyester coating is standard for 10"-20" bodies
  • 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
  • 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
  • Sanitary & Chemical applications
  • One-piece disc/stem
  • High Cv, low pressure drop

Specifications

Brand

Size Range

  • 1 - 20” (25 - 500 mm)

Temperature Range

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

Maximum Allowable Operating Pressure

  • 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

Certifications

  • ABS, Bureau Veritas, CE/PED, DNV, 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

  • Stainless Steel, EPDM Molded over Stainless Steel, BUNA-N Molded over Stainless Steel

Seat Materials

  • EPDM, BUNA-N, PTFE Lined EPDM, FKM, Polyurethane

Stem Materials

  • Stainless Steel, EPDM Molded over Stainless Steel, BUNA-N Molded over Stainless Steel

Body Materials

  • Cast Iron, Ductile Iron, Stainless Steel, Aluminum

  • Sanitary Service
  • Mildly Corrosive/Toxic Media

Documentation

Brochure

Manuals

Product Information

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