Bray 3W/3L Series Rubber-Lined Butterfly Valves | Automated Isolation

Rubber-lined butterfly valves for isolation in HVAC water and seawater pipelines, with EPDM seat options

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Bray 3W/3L Series resilient-seated butterfly valves are designed for pipeline isolation and automated control. They are available with 3W wafer-style and 3L lug-style valve bodies for NPS 2–24 (DN50–DN600) pipelines. The valves have a maximum allowable pressure of 250 psi (17.2 Bar), use EPDM or BUNA-N seats to provide bidirectional bubble-tight sealing, and feature an ISO 5211 top flange. They are suitable for on/off isolation in HVAC water systems and seawater desalination process piping.

Specifications

Nominal Size Range: NPS 2 - 24, DN50 - DN600
Maximum Allowable Operating Pressure: Up to 250 psi (17.2 Bar)
Operating Temperature Range: -20°F to 250°F (-29°C to 121°C)
Seal Rating: Bidirectional bubble-tight shutoff
Body Type: Wafer 3W, lug 3L
Body Materials: Cast iron, ductile iron
Seat Materials: EPDM, BUNA-N
Disc Materials: Nylon 11-coated ductile iron, stainless steel
Stem Material: Stainless steel
Actuator Mounting Standard: ISO 5211 top flange
Flange Drilling Standards: API 609 Category A, ASME B16.1 Class 125, ASME B16.5 Class 150, AS 2129 Table D and E, EN 1092 PN6, PN10, PN16, JIS 10K
Design Standards: API 609 Category A, EN 593, MSS SP-67
Face-to-Face Standards: API 609 Category A, EN 558 Series 20
Testing Standards: API 598, ISO 5208, EN 12266-1, MSS SP-61
Certifications: ABS Type Approval, CE/PED, CRN, FDA, ANSI/NSF 372, ANSI/NSF-61

Application scenarios

HVAC Water System Piping Isolation and Automated Control

Suitable for shutoff isolation in HVAC water piping systems. This series features bidirectional bubble-tight sealing and an ISO 5211 top flange, supporting actuator installation and automated control.

Desalination Process Piping Isolation

Suitable for seawater transfer and associated water piping in desalination systems, for isolating pipe sections and equipment. Product documentation explicitly lists desalination as an application and offers stainless steel or Nylon 11-coated ductile iron disc options.

Selection points

ISO 5211 Direct-Mount Actuator Interface

The valve top flange complies with ISO 5211 and supports direct actuator mounting for automated isolation configurations.

Integrated Disc and Stem Design Reduces Lag

The disc and stem feature an integrated design that reduces actuation lag and improves control accuracy, making the valve suitable for high-cycle automated applications.

3W Wafer and 3L Lug-Style Body Options

The series is available with 3W wafer-style and 3L lug-style bodies. The 3L lug-style design supports end-of-line installation, allowing selection based on piping installation requirements.

Molded Resilient Seat with Bidirectional Bubble-Tight Shutoff

The valve uses a molded resilient seat to provide bidirectional bubble-tight shutoff for applications requiring reliable isolation.

Installation & maintenance notes

Match Body Style with Piping and Flanges

Before installation, confirm whether the valve is the 3W wafer-style or 3L lug-style version, and select compatible pipe flanges and connection methods. The 3L lug-style body supports end-of-line installation.

FAQ

How do 3W/3L resilient-seated butterfly valves work?

The 3W/3L Series features a one-piece body and molded resilient seat, with the disc and stem integrated to provide sealing and valve operation. The seat and disc maintain bubble-tight sealing throughout the valve stroke, ensuring reliable shutoff in high-cycle automated applications.

Which key parameters should be considered when selecting this valve series?

Key considerations include the size range (DN50-DN600, NPS 2-24), temperature range (-29°C to 121°C), maximum allowable working pressure (up to 17.2 Bar), EPDM/BUNA-N seat materials, stainless steel stem material, and bidirectional bubble-tight shutoff.

What are the key installation considerations for flange connections?

The top flange complies with ISO 5211 for direct actuator mounting. The droplet-shaped seat sealing design is compatible with multiple flange types and ensures reliable sealing after tightening.

What service conditions and applications are suitable for this valve series?

Suitable applications include potable water, wastewater, seawater, HVAC, data centers, sugar processing, and ethanol production. The valves provide bubble-tight sealing and reliable shutoff in corrosive and industrial media.

How can the configuration and performance limits of a specific model be determined?

Specific configurations must be confirmed according to the actual model and application conditions. Select the valve by matching body material, seat material, sealing material, and connection type, and refer to the above technical specifications for preliminary sizing.

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