Resilient Seated Butterfly Valve

Series 3A/3AH

Size Range
2 - 20" (50 - 500mm)
Temperature Range
-20°F to 400°F (-29°C to 204°C)
Pressure Ratings
Series 3A: 175 psi (12 bar)
Series 3AH: 250 psi (16 bar)


Resilient Seated Butterfly Valve - Series 3A/3AH

Size Range
2 - 20" (50 - 500mm)
Body Materials
Cast Iron, Ductile Iron, Carbon Steel
Temperature Range
-20°F to 400°F (-29°C to 204°C)
Stem Materials
Stainless Steel, Monel K500
Pressure Ratings
Series 3A: 175 psi (12 bar)
Series 3AH: 250 psi (16 bar)
Seat Materials
Bonded EPDM, Bonded BUNA-N, Bonded FKM
Shutoff Rating
Bidirectional Bubble-tight
Disc Materials
Nylon 11 Coated Ductile Iron, Aluminum Bronze, Stainless Steel
Body Style
Double Flanged
Flange Drilling
ASME B16.1 Class 125, ASME B16.5 Class 150, EN 1092 PN10, PN16
Testing Standard
MSS SP-61, API 598, EN 12266-1
ABS, Bureau Veritas, China Classification Society (CCS), DNV, SIL
Face to Face
API 609 Category B short patern, EN 558 Series 13
Wastewater, Seawater, Water, other liquids and gases

Features & Benefits

Bray's Series 3A/3AH resilient seated butterfly valve features a double flanged design that is well-suited for dead-end service. International compatibility is a major design advantage of Bray's modular valve product lines.

The same valve is compatible with most world flange standards – ASME Class 125/150, BS 10 Tables D and E, BS 4504 NP 10/16, AS 2129 and JIS10. Additionally, Series 3A and 3AH valves are designed to comply with ISO 5752-Table 2 (EN558 Table 13) face-to-face and ISO 5211 actuator mounting flanges resulting in one valve design that can be used in a variety of world markets.

  • A. Stem

    Precision double "D" disc to stem connection drives the disc without the need of screws or pins.

  • B. Seat

    Bray's bonded 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.

  • C. 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.

  • D. Stem Bushing

    Non-corrosive, heavy duty acetal bushing absorbs actuator side thrusts.

  • E. Stem Seal

    Double "U" cup seal design is self-adjusting, gives positive sealing in both directions, and prevents external substances from entering the stem bore.

  • F. Extended Neck

    Extended neck length allows for 2" (50 mm) of piping insulation and is easily accessible for mounting actuators.

  • 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. Disc

    Spherically machined and hand polished to provide a bubble-tight shutoff, minimum torque, and longer seat life.

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