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Bray Series 767 Bidirectional High-Pressure Slurry Knife Gate Valve

Bidirectional high-pressure slurry knife gate valve with pneumatic actuator support

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The Bray Series 767 is a bidirectional high-pressure slurry knife gate valve for NPS 3 to 36 (DN 80 to 900) pipelines, with a maximum allowable operating pressure of up to 740 psi (51 bar). Its two-piece bolted flange body features a steel-reinforced elastomer sleeve with bidirectional energized sealing and a full-port, unobstructed flow path for on/off isolation in abrasive slurry pipelines in mining, pulp and paper, and cement industries.

Specifications

Valve Type: Bidirectional knife gate valve
Nominal Size Range: NPS 3 to 36 / DN 80 to 900
Maximum Allowable Operating Pressure: 300 psi (20 bar), 450 psi (31 bar), or 740 psi (51 bar)
Body Material: Carbon steel (WCB), with other materials available on request
Body Construction: Two-piece bolted flanged body
Flange Drilling Standard: ASME CL300
Sealing Method: J-ring steel-reinforced elastomer sleeve with bidirectional energized zero-leakage sealing
Seat Materials and Temperature Range: Natural rubber: 165°F / 74°C; EPDM: 248°F / 120°C
Gate Materials: 304, 316, 317 stainless steel, SAF 2507, SAF 2205, 17-4PH, Hastelloy® C, Monel®
Stem Material: 304 stainless steel
Flow Path: Full-port unobstructed flow path
Actuation Options: Handwheel, bevel gear, pneumatic, hydraulic, electric
Certifications: ATEX, CRN, PED, PE(S)R, TR CU, UA TR

Application scenarios

Mining Slurry Pipeline Isolation

Used for on/off isolation in mining slurry pipelines. Designed for high-pressure and abrasive slurries, this series features a full-bore, unobstructed flow path and bidirectional energized zero-leakage sealing, making it suitable for reliable isolation in solids-containing slurry pipelines.

Pulp and Paper Slurry Pipeline Isolation

Used for isolating fiber slurry conveying pipelines in the pulp and paper industry. This series is specifically designed for slurry applications, featuring a push-through gate and bidirectional sealing design for reliable shutoff of slurry flow.

Abrasive Slurry System Isolation in the Cement Industry

Used for isolation in abrasive slurry conveying or processing pipelines in the cement industry. This series incorporates slurry shield technology and steel-reinforced elastomer sleeves, providing a full-bore, unobstructed flow path suitable for solids-containing slurry service.

Selection points

Bidirectional Self-Energizing Sealing Design

Features a push-through gate and J-ring steel-reinforced elastomer sleeve design for bidirectional self-energizing, zero-leakage sealing in high-pressure slurry service.

Field-Maintainable Design with Replaceable Sleeves

Two elastomer sleeves are replaceable components and can be serviced in the field, helping extend the service life of the valve body, gate, and bonnet while reducing downtime.

Multiple Pressure Ratings for High-Pressure Slurry Service

Series 767 is designed for high-pressure slurry applications, with maximum allowable operating pressure options of 300 psi (20 bar), 450 psi (31 bar), or 740 psi (51 bar).

Multiple Gate Material Options

Gate materials are available in 304, 316, and 317 stainless steel, SAF 2507, SAF 2205, 17-4PH, Hastelloy C, and Monel, allowing selection according to slurry conditions and pressure rating.

Full-Port Unobstructed Flow Path

The valve features a full-port, unobstructed flow path suitable for slurry conveying applications.

Installation & maintenance notes

Verify Pressure Rating Compatibility with Operating Conditions

Before installation and commissioning, verify that the selected valve's maximum allowable operating pressure matches the actual pipeline operating conditions. Operating pressure must not exceed the valve's applicable pressure rating.

Verify Seat Material Suitability for Media Temperature

Before installation, select the appropriate elastomer seat material based on the actual media temperature: natural rubber is suitable for temperatures not exceeding 74°C, and EPDM is suitable for temperatures not exceeding 120°C.

FAQ

What is the operating principle of the Series 767 bidirectional knife gate valve?

The Series 767 uses a push-through gate design with bidirectional zero-leakage sealing. SlurryShield technology provides stable sealing and flow control under high-pressure slurry conditions.

What technical advantages does this valve offer in highly abrasive media?

SlurryShield technology and the replaceable elastomer sleeve extend the wear life of the body, gate, and bonnet while supporting in-field maintenance to reduce downtime.

How should gate and seat materials be matched during valve selection?

Multiple stainless steel alloys are available for the gate. Seat material temperature ranges and media corrosivity must be considered. The specific combination should be confirmed based on media properties, pressure rating, and temperature conditions to meet corrosion-resistance and strength requirements.

What actuation options are available for the Series 767?

Available options include handwheel, bevel gear, pneumatic, hydraulic, and electric actuators to suit various installation and field application requirements.

How should field maintenance be performed to ensure long-term performance?

During maintenance, replace the elastomer sleeve as needed, inspect the gate material and sealing components, and maintain the unobstructed flow path. The specific configuration should be confirmed based on the actual model and application conditions.

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