High Performance Butterfly Valve

McCannalok™

Zero-Leakage Valves with API 607 Certification for High-Pressure and High-Temperature Applications

Closer Look Request a Quote
McCannalok 6 McCannalok 3 McCannalok 5 McCannalok 7 McCannalok 8 McCannalok 9

High-Performance Double Offset Butterfly Valves for Extreme Service Conditions

Reliable Zero-Leakage Butterfly Valves for High Pressure and Temperature Applications

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.

Specifications

Size Range
NPS 2 to 66 / DN 50 to 1500
Body Materials
Carbon Steel, Stainless Steel, Nickel Aluminum Bronze
Stem Materials
Stainless Steel
Maximum Allowable Operating Pressure
Series 40/41 ASME Class 150
Series 42/43 ASME Class 300
Series 44/45 ASME Class 600
Series 4A/4B ASME Class 150/300
EN 1092 PN 10, 16, 25, 40, 63, 100
Seat Materials
RTFE with Resilient Energizer, PTFE with Resilient Energizer
Fire Safe: RTFE and Inconel® with Resilient Energizer
Shutoff Rating
Zero Leakage
Disc Materials
Stainless Steel, Nickel Aluminum Bronze
Body Style
Wafer, Lug, Double Flanged
Design Standard
ASME B16.34, ASME VIII, API 609
Flange Drilling
ASME B16.5, EN 1092
Testing Standard
API 598
Certifications
ABS, API 607, ATEX, Bureau Veritas, CCS, DNV, ISO 10497, NSF 61/372, PED, PE(S)R, SIL
Face to Face
API 609
Fugitive Emissions Standard
ISO 15848-1, API 641
Temperature Range
-62°F to 500°F (-52°C to 260°C)
applications
High Pressure, High Temperature, Critical Service

Downloads

Sales Data Sheet
High Performance Butterfly Valve McCannalok™

Technical Sales Manual
High Performance Butterfly Valves McCannalok™

Product Brochure
Bray/McCannalok™ Snow Brochure

IOM Manual
High Performance Butterfly Valves McCannalok™ Series

Safety Manual
High Performance Butterfly Valves McCannalok™ Series 4X

Application Guide
Turbine Trip And Anti-Surge Valves

Recommended Specs
High Performance Butterfly Valves McCannalok™

Selection Guide
Control Valves Version 2.0

More Details

Features & Benefits

  • A. Stem Design

    High-strength, one-piece stem design is standardized for interchangeability of Bray actuators.

  • B. Blowout-Proof Stem

    The stem retention design does not rely on actuation components to prevent stem blowout.

  • C. Adjustable Stem Packing

    Easy access allows simple quarter-turn field adjustments without actuator removal.

  • 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.

  • 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.

  • F. Disc

    The disc is engineered to maximize flow and minimize resistance for optimal flow rates.

  • G. Internal Over-travel Stop

    Designed to minimize possible seat damage — extending the service life of the seat.

  • H. Bidirectional Resilient Seat

    Provides bidirectional zero-leakage sealing while isolating the energizer from line media.

  • I. Full-faced Seat Retainer

    Cap screws located outside sealing area are protected from corrosion while allowing simple seat replacement.

  • J. Body

    Extended neck allows access to stem packing adjustments and actuator mounting when valve is fully insulated.

  • 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)

McCannalok-44-45-min

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

Our Portfolio

Looking for More Solutions?

Discover Our Range of Products Built for Your Industry's Challenges

Contact Us

Request A Quote