The Bray 740 Series is a bidirectional knife gate valve featuring a one-piece lug body and full-port flow passage, suitable for NPS 2 to 36 (DN 50 to 900) pipelines. Its mechanically retained steel-reinforced resilient seat provides bidirectional zero leakage. Multiple body, gate, and actuator material options are available for applications requiring bidirectional shutoff and low pressure drop.
740 Series Bidirectional Knife Gate Valve Product Image
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Bray Series 740 Bidirectional Knife Gate Valve | Bidirectional Zero Leakage
Bidirectional knife gate valve for media isolation in pulp, power, and wastewater applications, with optional pneumatic actuator
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Confirm model, connection and key options before ordering.
After-sales support
After-sales communication support is provided according to the order agreement.
Specifications
- Nominal Size Range
- NPS 2 to 36 / DN 50 to 900
- Maximum Allowable Operating Pressure
- NPS 2 to 24: 150 psi / DN 50 to 600: 10 bar; NPS 30 to 36: 100 psi / DN 750 to 900: 7 bar
- Body Construction
- One-piece, lugged
- Body Materials
- Carbon steel (WCB), CF8 stainless steel, CF8M stainless steel, CF3M stainless steel, SAF 2205, SAF 2507
- Stem Material
- 304 stainless steel
- Gate Materials
- 304, 316, 317 stainless steel, SAF 2507, SAF 2205, 17-4PH, Hastelloy® C, Monel®
- Seat Materials and Temperature Range
- Buna-N: -34 to 194°F (-36 to 90°C); EPDM: -65 to 248°F (-54 to 120°C); Viton®: -15 to 392°F (-26 to 200°C)
- Sealing Performance
- Mechanically retained, steel-reinforced resilient seat with bidirectional zero-leakage sealing
- Flow Passage
- Full port, minimum pressure drop
- Design Standard
- MSS SP81
- Face-to-Face Standard
- MSS SP81
- Testing Standard
- MSS SP151
- Maximum Packing Temperature
- PTFE: 500°F (260°C); PTFE-impregnated: 450°F (232°C); PTFE/Buna-N: 194°F (90°C); PTFE/Viton®: 392°F (200°C); PTFE/EPDM: 248°F (120°C)
- Actuator Options
- Handwheel, bevel gear, pneumatic, hydraulic, electric
- Certifications
- ATEX, AWWA C520 (2019), CRN, PED, PE(S)R, TR CU, UA TR
Selection points
Bidirectional Zero-Leakage Resilient Seat Seal
A mechanically retained, steel-reinforced resilient seat provides bidirectional zero-leakage sealing for applications requiring isolation in both directions.
Multiple Body and Gate Material Options
Body options include WCB, CF8, CF8M, CF3M, SAF 2205, and SAF 2507. Gate options include 304, 316, and 317 stainless steel, SAF 2205, SAF 2507, 17-4PH, Hastelloy C, and Monel, allowing material selection according to media and service conditions.
Full-Port, Low-Pressure-Drop Flow Path
The full-port flow path minimizes pressure drop and is suitable for isolation applications where valve flow resistance is a key consideration.
Multiple Actuation Options
Available with handwheel, bevel gear, pneumatic, hydraulic, and electric actuators to suit site operating and automation requirements.
Installation & maintenance notes
Verify the Applicable Temperature Range of Seat and Packing Materials
Before installation and commissioning, verify that the allowable temperature range of the selected seat and packing materials meets the actual media temperature and service requirements. Maximum applicable temperatures vary among Series 740 seat materials and packing configurations.
Verify the Maximum Allowable Operating Pressure for the Nominal Size
Before installation and commissioning, confirm that the system operating pressure does not exceed the maximum allowable operating pressure for the applicable Series 740 nominal size. The maximum allowable operating pressure is 150 psi/10 bar for NPS 2 to 24/DN 50 to 600 and 100 psi/7 bar for NPS 30 to 36/DN 750 to 900.
FAQ
What is the operating principle of the 740 Series bidirectional knife gate valve?
The 740 Series combines a one-piece cast body with a replaceable soft seat to provide bidirectional zero-leakage sealing. The gate remains aligned throughout its full travel, and manual or automated operation is available through various actuators.
How does this valve achieve bidirectional zero-leakage sealing, and what media is it suitable for?
The valve uses a steel-reinforced resilient seat with a mechanically retained design to ensure bidirectional sealing. Packing and seat materials, along with their temperature ranges, are designed to maintain sealing performance under a variety of operating conditions. Confirm the specific selection based on the actual model and application conditions.
How are the size and pressure ratings of the 740 Series typically selected?
The size range covers NPS 2 to 36 / DN 50 to 900, and the maximum allowable operating pressure varies by size range. Selection should be based on site pipe size and process pressure conditions. Confirm the specific configuration based on the actual model and application conditions.
What actuator types are available, and how should they be selected for field use?
Available actuator options include handwheel, bevel gear, pneumatic, hydraulic, and electric. Selection should be based on the control system, automation requirements, and ease of field maintenance. Confirm the specific selection based on the actual model and application conditions.
What value does the 740 Series provide in industries such as pulp and chemical processing?
Its high-strength body, bidirectional zero-leakage sealing, and design tested for reliability and durability improve process reliability and operating efficiency, particularly in applications requiring high sealing performance and corrosion resistance. Confirm the specific configuration based on the actual model and application conditions.
Documents
Product Brochure - 740 Series Bidirectional Knife Gate ValveProduct information · EnglishProduct Brochure - Knife Gate Valve and Slurry Valve Product GuideProduct information · EnglishProduct Guide - Knife Gate Valves - Product GuideProduct information · EnglishIOM Manual - 740 Series Bidirectional Knife Gate ValveManual · EnglishProduct Brochure - 740 Series Bidirectional Knife Gate ValveProduct information · ChineseIOM Manual - 740 Series Bidirectional Knife Gate ValveManual · EnglishSales Data Sheet - KCA Linear SensorProduct information · EnglishRecommended Specification - 740 Series Bidirectional Knife Gate ValveProduct information · English