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Series 30/31

Resilient Seated Butterfly Valve


Size Range

NPS 2 to 20 / DN 50 to 500
NPS 14 to 20 / DN 350 to 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

Body Materials

Cast Iron, Ductile Iron, Carbon Steel, Aluminum

Stem Materials

Stainless Steel, Monel K500

Seat Materials

BUNA-N, EPDM, FKM, Polyurethane

Disc Materials

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

Flange Drilling

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


ABS, ATEX, Bureau Veritas, CRN, DNV, FDA 21 CFR 177.1550, NSF 61/372, PED, PE(S)R


Potable Water, Wastewater, Seawater, HVAC

Features & Benefits

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.