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Resilient Seated Butterfly Valve

Series 3W/3L

Temperature Range
-20°F to 250°F (-29°C to 121°C)
Maximum Allowable Operating Pressure
Maximum 250 psi (17.2 Bar)


Resilient Seated Butterfly Valve - Series 3W/3L
Size Range

2 – 24 NPS, DN50 - DN600

Body Materials

Cast Iron, Ductile Iron

Temperature Range

-20°F to 250°F (-29°C to 121°C)

Stem Materials

Stainless Steel

Maximum Allowable Operating Pressure

Maximum 250 psi (17.2 Bar)

Seat Materials


Shutoff Rating

Bidirectional Bubble-tight

Disc Materials

Nylon 11 Coated Ductile Iron, Stainless Steel

Body Style

Wafer 3W, Lug 3L

Design Standard

API 609, Category A, EN 593, MSS SP-67

Flange Drilling

API 609, Category A, ASME B16.1 Class 125, ASME B16.5 Class 150, AS 2129 Table D & E, EN 1092 PN6, PN10, PN16, JIS 10K

Testing Standard

API 598, ISO 5208, EN 12266-1, MSS SP-61


ABS Type Approval, CE/PED, CRN, FDA, ANSI/NSF 372, ANSI/NSF-61

Face To Face

API 609 Category A, EN 558 Series 20


Potable Water, Wastewater, Seawater, HVAC, Data Centers, Sugar & Ethanol

Features & Benefits

The Bray Series 3W/3L resilient seated butterfly valves feature a one-piece body with a molded-in seat to increase the products pressure rating and ability to operate in higher velocity applications. The 3W/3L offers a high-strength through stem design utilizing an internal disc to stem connection to reduce hysteresis.

The Series 3W/3L is engineered to provide bidirectional bubble-tight shutoff and isolation of the line media from the stem or valve body. Available in Buna-N and EPDM elastomers as well as Nylon Coated and stainless disc materials it offers a solid platform for a variety of applications. The ISO 5211 top flange allows for easy automation to pneumatic or electric actuation for on/off or modulation applications.

Tightly controlled moldling process produces accurate and repeatable dimensions, which leads to consistently lower torques over the valve’s lifetime.

Precision profiled disc sealing edge which extends the valves life by reducing wear as the disc and seat come into contact when sealing.

Tear-dropped shaped seat face enables tight sealing with a wide variety of industrial flanges.

Lug style valve allows for sealing at full rated pressure even when the downstream flange is removed.

To reduce operating torque and increase reliability in high cycle applications.