Bray Series 35F Large-Diameter Rubber-Lined Butterfly Valve (Fully Flanged)

Large-diameter rubber-lined butterfly valve for isolation in high-chloride pipelines, with bidirectional sealing capability

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The Bray 35F Series is a full-flange, large-diameter resilient-seated butterfly valve for NPS 32 to 60 (DN 800 to 1500), with a maximum allowable operating pressure of 75 psi (5 bar) and a temperature range of -29°C to 121°C. The valve features bonded EPDM or BUNA-N seats and provides bidirectional bubble-tight shutoff for control and isolation in large-diameter pipelines for flue gas desulfurization, mining, seawater, and potable water transmission and distribution.

Specifications

Nominal Size Range: NPS 32 to 60 / DN 800 to 1500
Valve Body Type: Full-flanged
Maximum Allowable Operating Pressure: 75 psi (5 bar)
Operating Temperature Range: -20°F to 250°F (-29°F to 121°C)
Valve Body Materials: Cast iron, ductile iron, Hastelloy®
Disc Materials: Duplex stainless steel, superaustenitic stainless steel, Hastelloy®
Stem Material: Stainless steel
Seat Materials: Bonded EPDM, bonded BUNA-N
Tightness Rating: Bidirectional bubble-tight shutoff
Flange Drilling Standards: ASME B16.1 Class 125, ASME B16.5 Class 150, ASME B16.47, EN 1092 PN10, 16
Testing Standards: MSS SP-61, API 598, EN 12266-1
Certifications: ATEX, NSF 61/372, PED, PE(S)R, SIL

Application scenarios

Flue Gas Desulfurization Systems

For flow control or isolation in large-diameter fluid pipelines in flue gas desulfurization systems. The product documentation for this series explicitly lists FGD applications and states that it is designed for high-chloride applications.

Mining Process Pipelines

For flow control or bidirectional isolation in large-diameter process pipelines associated with mining. The product documentation for this series explicitly lists mining applications, with a size range of NPS 32 to 60 or DN 800 to 1500, a full-flanged body, and bidirectional bubble-tight shutoff.

Seawater Conveyance and Circulation Systems

For control or shutoff in large-diameter pipelines for seawater conveyance or circulation. The product documentation for this series explicitly lists seawater applications and states that it is designed for high-chloride applications.

Potable Water Distribution Systems

For flow control or isolation in potable water treatment and large-diameter water transmission and distribution pipelines. The product documentation for this series states that it is suitable for potable water applications and features NSF 61/372 certification and bidirectional bubble-tight shutoff.

Selection points

Corrosion-Resistant Material Selection for High-Chloride Service

The Series 35F is designed for high-chloride applications, with disc options including duplex stainless steel, superaustenitic stainless steel, or Hastelloy®, and a Hastelloy® body option. It supports material-matched selection for applications such as FGD, mining, and seawater service.

Large-Diameter Full-Flanged Body

This series is available in nominal sizes NPS 32 to 60 or DN 800 to 1500 and features a full-flanged body. Selection should be confirmed based on pipeline size and mating flange connections.

Certifications for Potable Water and Industrial Compliance

The product is listed with NSF 61/372, ATEX, PED, PE(S)R, and SIL certifications. Certification applicability can be verified for potable water contact and industrial projects with relevant compliance requirements.

Bidirectional Bubble-Tight Sealing with Bonded Resilient Seat

The product uses a bonded EPDM or bonded BUNA-N seat and is specified for bidirectional bubble-tight sealing. Seat material can be selected according to the service medium while meeting bidirectional sealing requirements.

Installation & maintenance notes

Observe Operating Pressure and Temperature Limits

During commissioning and operation, actual service pressure must not exceed 75 psi (5 bar), and operating temperature must remain within the range of -29°C to 121°C.

FAQ

How does the 35F Series resilient-seated butterfly valve operate?

The 35F Series provides sealing and flow control through the interaction of its double-flanged, resilient-lined valve body and disc. The seat is available in bonded EPDM or BUNA-N, while the disc uses stainless steel and highly corrosion-resistant alloys to ensure stable flow control in high-chloride environments.

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

Consider the size range (NPS 32–60 / DN 800–1500), maximum allowable operating pressure of 75 psi, temperature range of -29°C to 121°C, valve body materials (cast iron, ductile iron, and Hastelloy®), seat materials, tightness rating, and flange drilling standards.

What applications is the 35F Series suitable for?

It is suitable for high-chloride environments in drinking water-related systems and industrial applications, including mining, seawater treatment, and services involving corrosive media. The series has also passed certifications including NSF/ANSI 61/372.

What are the key installation and maintenance considerations for this series?

The valve uses full-flanged connections and should be installed in accordance with the applicable flange standards. Routine maintenance focuses on the durability of the sealing materials and stem lubrication, along with regular inspection for seal leakage and verification of connection bolt torque. The specific configuration must be confirmed according to the actual model and service conditions.

What are the material and certification advantages of the 35F Series?

Valve body materials include cast iron, ductile iron, and Hastelloy®. The seat and disc materials offer corrosion-resistant options, and the series carries certifications including ATEX, NSF 61/372, PED, PE(S)R, and SIL, enhancing application reliability in demanding environments.

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