The Bray Series 942 vortex breaker unidirectional knife gate valve is a pneumatically actuated, one-piece lug valve designed for on-off isolation in NPS 4 to 12 (DN 100 to 300) pipelines, with a maximum allowable operating pressure of 150 psi (10 bar). The CF8M stainless steel body, 17-4PH gate, and replaceable Hi-Chrome vortex breaker help suppress swirl-related wear, making it suitable for cleaners, cyclones, pulpers, and waste branches in pulp and paper recycling systems.
Unidirectional Knife Gate Valve Series 942 product image
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Bray Series 942 Vortex Breaker Unidirectional Knife Gate Valve
Vortex breaker knife gate valve for pulp recovery and waste isolation, featuring a replaceable Hi-Chrome vortex breaker.
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Specifications
- Nominal Size Range
- NPS 4 to 12 / DN 100 to 300
- Maximum Allowable Operating Pressure
- 150 psi (10 bar)
- Body Design
- One-piece lugged
- Body Material
- CF8M (316) stainless steel
- Gate Material
- 17-4PH H-1025
- Seat Type
- Integral metal seat
- Maximum Seat Temperature
- 482°F (250°C)
- Maximum Packing Temperature
- 482°F (250°C)
- Actuator Type
- Pneumatic
- Design Standard
- MSS SP-81
- Face-to-Face Standard
- MSS SP-81
- Certification
- CE/PED
- Vortex Suppressor
- Replaceable Hi-Chrome vortex breaker (500 HB)
- Flush Connections
- Seat and valve cavity flush ports
- Packing System
- Brass scraper, high-performance packing, and live-loaded packing gland
Application scenarios
High-Density Cleaner and Cyclone Separator Isolation
For on/off isolation of high-density cleaners and cyclone separators in pulp and paper recycling processes. Replaceable vortex breakers suppress swirl-induced wear on valve components.
Pulper Contaminant Handling Line Isolation
For on/off isolation of pulpers and contaminant handling lines in pulp and paper recycling processes, suitable for media containing fibers and rejected contaminants.
Trash Collector and Waste Branch Line Isolation
For on/off isolation of trash collectors or waste handling branch lines in pulp and paper recycling systems.
Selection points
Replaceable Hi-Chrome Vortex Breaker
Equipped with a replaceable Hi-Chrome vortex breaker with a hardness of 500 HB to disrupt swirling flow in cyclone separator and high-density cleaning applications, reducing erosive wear on valve components caused by contaminant-laden vortices.
17-4PH H-1025 Gate and Integral Metal Seat
The valve features a 17-4PH H-1025 gate and an integral metal seat for applications requiring shear isolation, such as pulp recovery and waste handling.
Brass Scraper and Dynamic-Load Packing Gland System
The packing system includes a brass scraper, high-performance packing, and a dynamic-load packing gland for frequent cycling applications.
Seat and Valve Cavity Flush Ports
The seat and valve cavity are fitted with flush ports for convenient cleaning and maintenance of critical areas prone to media buildup.
CF8M Stainless Steel Body and Metal Seat
The valve body is made of CF8M (316) stainless steel and features an integral metal seat rated for temperatures up to 250 °C.
Installation & maintenance notes
Vortex Breaker Installation and Maintenance
During installation and maintenance, ensure that the replaceable Hi-Chrome vortex breaker is correctly positioned and can be inspected and replaced. The vortex breaker suppresses swirling flow and reduces wear on the gate and valve body.
Use of Seat and Valve Cavity Flush Connections
The valve is equipped with seat and valve cavity flush ports. In applications containing contaminant particles, use appropriate flushing measures in accordance with site maintenance requirements to reduce the effects of deposits on gate operation and sealing performance.
FAQ
What is the operating principle of the Series 942 unidirectional knife gate valve?
The Series 942 provides on/off isolation through a replaceable vortex breaker and metal seat. In circulating media, the vortex suppressor disrupts swirling flow to prevent premature wear of the gate and valve body, enabling reliable opening and complete closure.
How should the valve be selected for high-cycle waste-handling applications to ensure sufficient cutting performance?
Selection should consider the size range, actuator type, temperature resistance of the body and seat materials, and the replaceability and wear resistance of the vortex suppressor to support long-term operation with high-frequency cutting media.
What are the temperature and pressure limits of this valve?
The maximum allowable operating pressure is 150 psi. The seat and packing are rated for temperatures up to 250°C (482°F); confirmation is still required for the specific model. The specific configuration must be confirmed according to the actual model and application conditions.
What key design features of the Series 942 support long-term maintenance?
The vortex breaker uses a replaceable high-chrome alloy design. An integral metal seat, brass scraper packing, live-loaded gland, and robust alignment features (U-clip design and horizontal bolt fastening) together improve service life and ease of maintenance.
What are typical applications for this valve in pulp and paper recycling?
It is suitable for on/off isolation and waste-handling applications in equipment such as cyclones, knotters, pulpers, HD cleaners, and high-density cyclone cleaners, providing reliable cutting and shutoff performance under high-cycle conditions.
Documents
IOM Manual - Series 942 Vortex-Breaker Knife Gate Valve for Recycling/RejectsManual · EnglishTechnical Sales Manual - Series 942 Vortex-Breaker Knife Gate Valve for Recycling/RejectsManual · EnglishTechnical Sales Manual - Series 942 Vortex-Breaker Knife Gate Valves for Recycling/RejectsManual · EnglishSales Data Sheet - Series 942 Vortex-Breaker Knife Gate Valve for Recycling/RejectsProduct information · EnglishSales Data Sheet - KCA Linear SensorProduct information · EnglishSales Data Sheet - Series 942 Vortex-Breaker Knife Gate Valves for Recycling/RejectsProduct information · EnglishSales Data Sheet - Series 942 Vortex-Breaker Knife Gate Valve for Recycling/RejectsProduct information · English