• Series 20/21
  • Series 22/23
  • Series 30/31
  • Series 31H
  • Series 31U
  • Series 3A/3AH
  • Series 32/33 & 35/36
  • Series 36H
  • Series 35F
  • Series 39L
  • Resilient Seated
  • Series 30/31

Series 30/31

Additional Info

  • Size Range: 2" - 20" (50mm - 500mm)
  • Body Style: Wafer, Lug
  • Temperature Range: -20°F to 400°F (-29°C to 204°C)
  • Pressure Ratings: Bidirectional Bubble-tight Shut-Off: to 175 psi (12 Bar)
    Body (CWP): 250 psi (17.2 Bar)
  • Body Materials: Cast Iron, Ductile Iron, Carbon Steel, Aluminum
  • Disc Materials: Nylon 11 Coated Ductile Iron, Aluminum Bronze, Stainless Steel, Hastelloy®*, Halar®* Coated Ductile Iron
  • Stem Materials: Stainless Steel, Monel K500
  • Seat Materials: BUNA-N, EPDM, FKM*, Polyurethane
  • Applications: Potable Water, Wastewater, Seawater, HVAC
  • The series 30/31 butterfly valve's high strength through-stem design allows easy dis-assembly and reduced disc to stem failure.

    Series 30/31 Callouts



    [A] 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.

    [B] STEM BUSHING: Non-corrosive, heavy duty acetal bushing absorbs actuator side thrust.

    [C] STEM SEAL: Double "U" cup seal design is self-adjusting and gives positive sealing in both directions.

    [D] NECK: Extended neck length allows for 2" of piping insulation and is easily accessible for

    [E] DISC: Casting is spherically machined and hand polished to provide a bubble-tight shut off, minimum torque, and longer seat life.

    [F] BODY: One-piece wafer or lug style. Polyester coating for excellent corrosion resistance. Nylon 11 coating is available as an option.

    [G] 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.

    [H] 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.

    [I] 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.

  • COMPONENTS AND MATERIALS
    Material availability depends on valve size & series. Other materials are available. Please consult your local Bray representative for your specific condition.
    *FKM is the ASTM D1418 designation for Fluorinated Hydrocarbon Elastomers (also called Fluoroelastomers).
    Halar® is a registered trademark of Ausimont U.S.A., Inc.
    Hastelloy® is a registered trademark of Haynes International, Inc.
    Item Name Material Qty.
    1 Body Cast Iron
    Ductile Iron
    Carbon Steel
    Aluminum
    1
    2 Disc Nickel Aluminum Bronze
    Coated Ductile Iron
    Nylon 11 Coated Ductile Iron
    Halar® Coated Ductile Iron
    304 Stainless Steel
    316 Stainless Steel
    Duplex Stainless Steel
    Super Duplex Stainless Steel
    Hastelloy®
    1
    3 Stem 416 Stainless Steel
    304 Stainless Steel
    316 Stainless Steel
    Monel K500
    1
    4 Seat BUNA-N - Food Grade
    EPDM - Food Grade
    FKM*
    White BUNA-N - Food Grade
    Bonded EPDM
    Bonded BUNA-N
    1
  • Imperial
    Metric
    • Dimensions and Weights - Imperial - Series 30 Wafer / Series 31 Lug
      Note: K dimension is disc chordal dimension at valve face.
      Size in A B C D E F G H J K L Adapt. Code Weight lb
      Wafer Lug Wafer Lug
      2 3.69 1.62 2.00 2.85 5.50 3.54 .55 39 1.25 1.32 2.22 2.30 A 5.5 7.0
      4.19 1.75 2.50 3.36 6.00 3.54 .55 .39 1.25 1.91 2.47 2.57 A 7.0 8.0
      3 4.88 1.75 3.00 4.15 6.25 3.54 .55 .39 1.25 2.55 2.81 2.81 A 7.5 9.0
      4 6.06 2.00 4.00 5.16 7.00 3.54 .63 .43 1.25 3.57 3.41 4.09 B 11.5 15.0
      5 7.06 2.12 5.00 6.16 7.50 3.54 .75 .51 1.25 4.63 4.03 4.61 C 14.0 20.0
      6 8.12 2.12 5.75 7.02 8.00 3.54 .75 .51 1.25 5.45 4.53 5.06 C 17.0 23.0
      8 10.50 2.50 7.75 9.47 9.50 5.91 .87 .63 1.25 7.45 5.75 6.05 D 34.0 42.0
      10 12.75 2.50 9.75 11.47 10.72 5.91 1.18 .87 2.00 9.53 7.12 7.69 E 49.0 66.0
      12 14.88 3.00 11.75 13.47 12.25 5.91 1.18 .87 2.00 11.47 8.12 9.02 E 67.0 88.0
      14 17.05 3.00 13.25 15.28 13.62 5.91 1.38 2.00 .39x.39 13.04 9.38 9.93 F 95 114
      16 19.21 4.00 15.25 17.14 14.75 5.91 1.38 2.00 .39x.39 14.85 10.75 11.30 F 135 166
      18 21.12 4.25 17.25 19.47 16.00 8.27 1.97 2.50 .47x.39 16.85 12.00 12.15 G 200 226
      20 23.25 5.00 19.25 21.59 17.25 8.27 1.97 2.50 .47x.39 18.73 14.00 14.00 G 260 305
    • Top Plate Drilling and Lug Bolting Data - Imperial - Series 30 Wafer / Series 31 Lug
      Size in Top Plate Drilling Lug Bolting Data
      BC No. of Holes Hole Dia. Bolt Circle No. of Holes Threads ISO Course
      2 2.76 4 .39 4.75 4 .62-11
      2.76 4 .39 5.50 4 .62-11
      3 2.76 4 .39 6.00 4 .62-11
      4 2.76 4 .39 7.50 8 .62-11
      5 2.76 4 .39 8.50 8 .75-10
      6 2.76 4 .39 9.50 8 .75-10
      8 4.92 4 .57 11.75 8 .75-10
      10 4.92 4 .57 14.25 12 .88-9
      12 4.92 4 .57 17.00 12 .88-9
      14 4.92 4 .57 18.75 12 1.00-8
      16 4.92 4 .57 21.25 16 1.00-8
      18 6.50 4 .81 22.75 16 1.12-7
      20 6.50 4 .81 25.00 20 1.12-7
    • Dimensions and Weights - Metric - Series 30 Wafer / Series 31 Lug
      Note: K dimension is disc chordal dimension at valve face.
      Size mm A B C D E F G H J K L Adapt.
      Code
      Weight kg
      Wafer Lug Wafer Lug
      50 94 43 51 72 140 90 14 10 32 34 56 58 A 2.5 3
      65 106 46 64 85 152 90 14 10 32 49 63 65 A 3 3.5
      80 124 46 76 102 159 90 14 10 32 65 71 71 A 3.5 4
      100 154 52 102 131 178 90 16 11 32 91 87 104 B 5 7
      125 181 56 127 156 190 90 19 13 32 118 102 117 C 6 9
      150 206 56 146 178 203 90 19 13 32 138 115 129 C 8 10
      200 267 60 197 240 241 150 22 16 32 189 146 154 D 15 19
      250 324 68 248 291 273 150 30 22 51 242 181 195 E 22 30
      300 378 76 298 342 311 150 30 22 51 291 206 229 E 30 40
      350 433 76 337 388 346 150 35 51 10x10 331 238 252 F 43 52
      400 488 102 387 442 375 150 35 51 10x10 377 273 287 F 61 75
      450 536 108 438 495 406 210 50 64 12x10 428 305 309 G 91 103
      500 591 127 489 548 438 210 50 64 12x10 476 348 358 G 118 138
    • Top Plate Drilling and Lug Bolting Data - Metric - Series 30 Wafer / Series 31 Lug
      Size mm Top Plate Drilling Lug Bolting Data
      BC No. of Holes Hole Dia. Bolt Circle No. of Holes Threads ISO Course
      50 70 4 10 121 4 .62-11
      65 70 4 10 140 4 .62-11
      80 70 4 10 152 4 .62-11
      100 70 4 10 191 8 .62-11
      125 70 4 10 216 8 .75-10
      150 70 4 10 241 8 .75-10
      200 125 4 14 298 12 .75-10
      250 125 4 14 362 12 .88-9
      300 125 4 14 432 12 .88-9
      350 125 4 14 476 12 1.00-8
      400 125 4 14 540 16 1.00-8
      450 165 4 21 578 16 1.12-7
      500 165 4 21 635 20 1.12-7
  • Valve Type: Bray Series 30 wafer or Series 31 lug or approved equal.
    Body:
    • Shall be one-piece wafer or lug design with extended neck to allow for 2" of piping insulation.
    • Flange locating holes shall be provided on wafer bodies to allow for quick and precise alignment during valve installation.
    • Flange hole drilling per international flange standard as specified.
    • A non-corrosive bushing and a self-adjusting stem seal shall be provided. No field adjustment shall be necessary to maintain optimum field performance.
    Disc
    • Disc edge and hub on metal discs shall be spherically machined and hand polished for torque and maximum sealing capability.
    Stem:
    • Shall be one-piece design.
    • Disc to stem connection shall be and internal double "D" design with no possible leak paths in the disc-to-stem connection. External disc-to-stem connections such as discscrews or pins are not allowed.
    • Stem shall be mechanically retained in the body neck and no part of the stem shall be exposed to the line media.
    Seat:
    • Shall be tongue-and-groove seat with a primary hub seal and a molded flange O-ring for weld-neck and slip-on flanges.
    • The seat shall totally encapsulate the body isolating it from the line media and no flange gaskets shall be required.
    Testing: Valve shall be tested to 110% of the rated pressure.
    Pressure Ratings: Valve shall be rated for bubble-tight shut-off at pressure rating shown below.
    All Resilient Seated Series 30 and Series 31 Valves (with Standard Disc):
    • 2"-12" (50mm-300mm) 175 psi (12.0 Bar)
    • 14"-20" (350mm-500mm) 150 psi (10.3 Bar)
    Dead-End Service (No downstream flanges and disc in closed position):

    All Series 31 Valves (with Standard Disc):

    • 2"-12" (50mm-300mm) 75 psi (5.2 Bar)
    • 14"-20" (350mm-500mm) 50 psi (3.4 Bar)

    Approvals & Certifications:

    • CE/PED Certification
    • NSF/ANSI 61-2008 Certification (Potable Water)
    • SIL Certification
    • ABS Certification
    • Bureau Veritas Certification
    • DNV
  • Document Type Download
    Resilient Seated Butterfly Valves Brochure PDF
    Technical Manual - Resilient Seated Butterfly Valves PDF
    Operations & Maintenance Manual - Resilient Seated Butterfly Valves PDF
    Safety Manual - Resilient Seated Butterfly Valves PDF
    EU Directives - Resilient Seated Butterfly Valves PDF
    Series 30/31 Recommended Specifications - Detailed PDF
    Series 30/31 Recommended Specifications - Summary PDF
    Series 30/31 Sales Reference Drawings PDF
    Resilient Seated Sales Reference Drawings PDF
  • Document Type Download
    Bray Resilient Seated Butterfly Valve Series 31 - Electric zip
    Bray Resilient Seated Butterfly Valve Series 31 - Pneumatic Manual Override zip
    Bray Resilient Seated Butterfly Valve Series 31 - Pneumatic Positioner zip