Bray McCannalok™ double-offset butterfly valves are designed for isolation and shutoff in steam, hydrogen, sour gas, corrosive chemical, and seawater pipelines. Available in NPS 2 to 66 (DN 50 to 1500), with wafer, lug, and double-flanged body styles, as well as resilient or metal-seated configurations, they provide bidirectional zero leakage. Suitable for refinery and natural gas processing, power-generation steam systems, seawater cooling, and water treatment applications.
McCannalok™ high-performance butterfly valve product image
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Bray McCannalok™ Double-Offset Butterfly Valve
Double-offset butterfly valve for high-pressure, high-temperature shutoff, with optional metal seating.
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Model confirmation
Confirm model, connection and key options before ordering.
After-sales support
After-sales communication support is provided according to the order agreement.
Specifications
- Size Range
- NPS 2 to 66 / DN 50 to 1500
- Maximum Allowable Operating Pressure
- 40/41 ASME Class 150; 42/43 ASME Class 300; 44/45 ASME Class 600; 4A/4B ASME Class 150/300; EN 1092 PN 10, 16, 25, 40, 63, 100
- Operating Temperature Range
- -62°F to 500°F (-52°C to 260°C)
- Leakage Class
- Bidirectional zero leakage
- Sealing Type
- Resilient seat, metal seat
- Body Materials
- Carbon steel, stainless steel, nickel aluminum bronze
- Disc Materials
- Stainless steel, nickel aluminum bronze
- Stem Material
- Stainless steel
- Seat Materials
- RTFE with resilient energizer, PTFE with resilient energizer; fire-safe: RTFE and Inconel® with resilient energizer
- Body Styles
- Wafer, lug, double-flanged
- Design Standards
- ASME B16.34, ASME VIII, API 609
- Flange Standards
- ASME B16.5, EN 1092
- Face-to-Face Standard
- API 609
- Testing Standard
- API 598
- Cycle Life
- More than 100,000 cycles
- Applicable Media
- Steam, hydrogen, sour gas (NACE), corrosive chemicals, seawater, high-temperature gases
- Fire-Safe Certification
- API 607, ISO 10497
- Fugitive Emissions Standards
- ISO 15848-1, API 641
- Product Certifications
- ABS, ATEX, Bureau Veritas, CCS, DNV, NSF 61/372, PED, PE(S)R, SIL
Application scenarios
Sour Gas and Hydrogen Line Shutoff in Refining and Natural Gas Processing Facilities
For isolation and shutoff of sour gas and hydrogen lines in refining and natural gas processing facilities. Product documentation explicitly confirms suitability for sour gas and hydrogen service, bidirectional zero leakage, fire-safe design, and compliance with fugitive emissions standards.
Steam Line Shutoff in Power Generation and Process Facilities
For main steam lines and associated isolation points in power plants and process facilities. Product documentation explicitly confirms suitability for steam and critical high-temperature, high-pressure service. The double-offset disc and stem design reduces operating torque and seat wear while supporting automated shutoff.
Seawater Cooling and Water Treatment Line Isolation
For pipeline isolation in seawater cooling and water treatment systems. Product documentation explicitly confirms suitability for seawater service, with nickel-aluminum bronze body and disc configurations. The size range extends to DN 1500 and provides bidirectional zero-leakage shutoff.
Selection points
Double-offset design reduces torque and seat wear
The double-offset disc and stem design reduces operating torque and seat wear, making it suitable for applications where frequent cycling life and sealing stability are critical.
Bidirectional zero leakage with optional sealing configurations
This valve provides bidirectional zero-leakage sealing and is available with resilient-seated and metal-seated configurations, enabling sealing solutions for high-pressure, high-temperature, and critical shutoff applications.
Materials and sealing options for demanding media
Multiple material and sealing configurations are available for the body, disc, and seat. Selection can be matched to media corrosiveness, temperature, and other conditions. Product documentation lists suitability for sour gas, corrosive chemicals, seawater, and other media.
Multiple pressure class configurations
This series covers ASME Class 150, 300, and 600, as well as EN 1092 PN 10 to PN 100 pressure ratings. The appropriate series can be selected according to pipeline pressure standards.
Multiple body styles available
The product is available in wafer, lug, and double-flanged body styles, allowing selection based on pipeline connection and installation requirements.
Fugitive emissions standard references
Product documentation lists ISO 15848-1 and API 641 fugitive emissions standards, which can serve as selection references for applications requiring control of stem and external fugitive emissions.
Installation & maintenance notes
Flange compatibility and installation alignment inspection
Before installation, confirm that the mating pipeline flanges match the valve flange standard, dimensions, and drilling specifications. Ensure correct alignment between the valve and pipeline to avoid abnormal valve loading, seal leakage, or abnormal operating torque.
Disc travel clearance confirmation
Before installation, confirm that the disc has sufficient opening and closing clearance within the pipeline. Avoid interference with the pipeline or adjacent components to ensure the valve can complete its full travel normally.
FAQ
How does the McCannalok high-performance butterfly valve work?
The McCannalok high-performance butterfly valve uses a patented double-offset disc and stem design to achieve zero-leakage sealing and reliable shutoff under high-temperature and high-pressure conditions. The optimized disc and stem configuration reduces torque and seat wear while ensuring bidirectional sealing. The specific operating principle should be confirmed based on the actual model and media conditions.
Which key parameters should be considered during selection to ensure zero-leakage performance?
Key parameters include the size range (NPS 2-66 / DN 50-1500), maximum allowable operating pressure, seat material and sealing type, body material, and applicable design standards and test certifications. The specific configuration should be confirmed according to the actual media and operating conditions.
What applications is this valve suitable for, and can it handle media such as steam and sour gas?
The valve has been tested to provide bidirectional zero-leakage sealing in demanding media including steam, hydrogen, sour gas, corrosive chemicals, seawater, and high-temperature gases, and incorporates a fire-safe design. Compatibility with specific media should be confirmed based on the actual model and application conditions.
What technical advantages does McCannalok offer over conventional butterfly valves?
Advantages include zero-leakage sealing, reduced torque and seat wear from the double-offset disc and stem design, long service life under extreme pressure, and automation compatibility with a variety of actuators, improving safety and operational reliability. Specific performance benefits should be confirmed against the actual model specifications.
How should the valve be maintained after installation to preserve sealing performance?
The valve features adjustable stem packing and a field-adjustable packing system, allowing maintenance and sealing adjustments without removing the actuator. Field maintenance should follow the maintenance manual and operating conditions for the actual valve model, without additional assumptions. Specific maintenance procedures depend on the actual model.
Documents
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