The Bray McCannalok™ High-Performance Butterfly Valve is engineered for critical industrial applications requiring zero leakage, high pressure, and high temperature performance. Featuring Bray’s patented double offset disc and stem design, the McCannalok™ valve minimizes torque, reduces seat wear, and extends service life beyond 100,000 cycles under extreme pressure.
Proven in independent and internal testing, the McCannalok™ valve delivers bi-directional zero-leakage sealing in severe media such as steam, hydrogen, sour gas (NACE), corrosive chemicals, seawater, and high-temperature gases. With a firesafe API 607 design option and available resilient or metal-seated configurations, the McCannalok™ valve ensures dependable shutoff in refineries, chemical plants, power generation, water treatment, and critical process industries worldwide.
Available in wafer, lug, and double-flanged body styles, with automation-ready compatibility for Bray pneumatic and electric actuators, the McCannalok™ combines precision engineering, rugged reliability, and simplified field maintenance—making it the trusted solution for global industries seeking safety, efficiency, and long-term performance.
High-Performance Double Offset Butterfly Valves for Extreme Service Conditions
Reliable Zero-Leakage Butterfly Valves for High Pressure and Temperature Applications
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Features & Benefits
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A. Stem Design
High-strength, one-piece stem design is standardized for interchangeability of Bray actuators.
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B. Blowout-Proof Stem
The stem retention design does not rely on actuation components to prevent stem blowout.
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C. Adjustable Stem Packing
Easy access allows simple quarter-turn field adjustments without actuator removal.
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D. Stem Seal System
PTFE packing rings with carbon fiber anti-extrusion ring provides constant compression for a positive seal around the stem. Options are available for high temperature, high cycle and firesafe applications.
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E. Stem Bearings
Top and bottom bearings securely support the stem, provide excellent corrosion resistance, and minimize deflection from high temperatures and mechanical loading forces.
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F. Disc
The disc is engineered to maximize flow and minimize resistance for optimal flow rates.
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G. Internal Over-travel Stop
Designed to minimize possible seat damage — extending the service life of the seat.
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H. Bidirectional Resilient Seat
Provides bidirectional zero-leakage sealing while isolating the energizer from line media.
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I. Full-faced Seat Retainer
Cap screws located outside sealing area are protected from corrosion while allowing simple seat replacement.
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J. Body
Extended neck allows access to stem packing adjustments and actuator mounting when valve is fully insulated.
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K. Dead-end Service
Lug and double-flanged bodies are full rated for bidirectional dead-end service.
Series 40/41/4A
Up to 285 psi (19.6 bar)
Valve Sizes (NPS)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 40 | Wafer | 2 to 66 | 2 to 48 | 2½ to 36 |
| 41 | Lug | 2 to 66 | 2 to 48 | 2½ to 36 |
| 4A | Double Flanged | 2 to 54 | 2 to 48 | 2½ to 36 |
Valve Sizes (DN)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 40 | Wafer | 50 to 1500 | 50 to 1200 | 65 to 900 |
| 41 | Lug | 50 to 1500 | 50 to 1200 | 65 to 900 |
| 4A | Double Flanged | 50 to 1400 | 50 to 1200 | 65 to 900 |
Series 42/43/4B
Up to 740 psi (51 bar)
Valve Sizes (NPS)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 42 | Wafer | 2 to 36 | 2 to 36 | 2½ to 30 |
| 43 | Lug | 2 to 54 | 2 to 36 | 2½ to 30 |
| 4B | Double Flanged | 3 to 42 | 2 to 36 | 2½ to 30 |
Valve Sizes (DN)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 42 | Wafer | 50 to 900 | 50 to 900 | 65 to 750 |
| 43 | Lug | 50 to 1400 | 50 to 900 | 65 to 750 |
| 4B | Double Flanged | 80 to 900 | 50 to 900 | 65 to 750 |
Series 44/45
Up to 1440 psi (100 bar)
Valve Sizes (NPS)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 44 | Wafer | 3 to 24 | 3 to 24 | 3 to 12 |
| 45 | Lug | 3 to 36 | 3 to 36 | 4 to 12 |
Valve Sizes (DN)
| Model | Body Style | Resilient Seated | Firesafe | Metal Seated |
|---|---|---|---|---|
| 44 | Wafer | 80 to 600 | 80 to 600 | 80 to 300 |
| 45 | Lug | 80 to 900 | 80 to 900 | 100 to 300 |
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