Brand: Bray International

Bray McCannalok Series 40/41 High-Performance Butterfly Valve

Name: Bray McCannalok 40/41 Butterfly Valve – Datasheet & Quote
Brand: Bray International
SKU: McCannalok Series 40/41

Description

Double offset high-performance butterfly valve for process and utility service

The McCannalok series is Bray’s patented double offset high-performance butterfly valve, engineered for high temperature, high pressure, high cycle and critical service. The Series 40 (wafer) and Series 41 (lug) cover ASME Class 150 in sizes NPS 2 to 66, and the wider McCannalok family continues with the Series 42/43 and 4B in Class 300, the Series 44/45 in Class 600, and the double flanged Series 4A.

The valve is built around an energized resilient seat: a resilient energizer is totally encapsulated by the seat and isolated from the line medium, locked in the body recess by a full-faced seat retainer bolted outside the sealing area. Sealing is bidirectional and pressure assisted, with the full rating available in dead-end service on lug and double flanged bodies. Bray lists oil and gas related duties such as sour gas (NACE) and pressure swing adsorption, together with steam, seawater, chilled water, caustic, acids, hydrogen, oxygen, vacuum and dry chlorine.

Technical specifications

Parameter	Specification
Size range (family)	NPS 2 to 66 (DN 50 to 1500 per datasheet)
Body styles	Wafer, lug, double flanged
Pressure classes	ASME Class 150, 300, 600; PN 10, 16, 25, 40, 63, 100
Series 40/41	ASME Class 150, NPS 2-66; 285 psi (20 bar)
Series 42/43 and 4B	ASME Class 300; 740 psi (50 bar)
Series 44/45	ASME Class 600, NPS 3-36; 1440 psi (100 bar)
Temperature, resilient seated	-62 to 500 deg F (-52 to 260 deg C)
Temperature, fire-safe	-62 to 500 deg F (-52 to 260 deg C)
Temperature, metal seated	Up to 900 deg F (482 deg C)
Leakage	Resilient seated: zero leakage; metal seated: FCI 70-2 Class IV
Design standards	ASME B16.34, MSS SP 68, ASME VIII, API 609 Category B, EN 593, EN 12516
Face to face	ASME B16.10, API 609 Category B, EN 558, ISO 5752
Flange drilling	ASME B16.5, ASME B16.47, EN 1092-1
Seat tightness test	API 598, MSS SP 61, EN 12266, ISO 5208
Body materials	Carbon steel, stainless steel, nickel aluminum bronze, Hastelloy C, titanium
Disc materials	Stainless steel, nickel aluminum bronze, Monel
Stem materials	Stainless steel, Monel K500, Inconel 718
Seat materials	RPTFE, PTFE or UHMWPE with resilient energizer; TFM with low-temperature energizer; Inconel and RPTFE (fire-safe)
Fire test	API 607; ISO 10497
Fugitive emissions	API 641; ISO 15848-1; TA-Luft VDI 2440
Approvals listed	CE (PED 2014/68/EU), ANSI/NSF 61, SIL, ABS, ATEX 2014/34/EU, Bureau Veritas, CCS, CRN, DNV, EC1935, TR CU
Top flange	ISO 5211

Source: Bray McCannalok datasheet SS-1023 and recommended specification sheet. Firesafe, high-cycle and metal-seated control options are not available in all sizes and pressure classes.

Seat and stem design

The seat is self-adjusting for wear and temperature changes, and its replacement is simple: remove the seat retainer, rotate the disc to the closed position and place a new seat assembly into the body recess, without disturbing disc or stem. The Bray recommended specification asks for a seat that gives tight shutoff after one million cycles and is pressure assisted rather than pressure dependent.

The stem is blowout proof with a prevention ring located outside the pressure boundary, supported by top and bottom bearings with 316 stainless steel shells and TFE lining, and the packing can be adjusted without removing the actuator. An internal over-travel stop protects the seat. The firesafe option combines an Inconel metal seat with graphite packing and bidirectional sealing to API 607.

Choosing the right McCannalok series

Choose the 40/41 for Class 150 service, the 42/43 for Class 300 and the 44/45 for Class 600, and the 4A or 4B when a double flanged body is needed. Metal-seated and firesafe versions suit high-temperature and hydrocarbon duty where an elastomer-based seat is not acceptable. Please provide size, pressure class, temperature, medium, leakage class, fire-safe or fugitive emission requirement, face-to-face standard and actuator.

Series	Class and body	Size
40/41 (this page)	Class 150, wafer / lug	NPS 2-66
42/43	Class 300, wafer / lug	NPS 2-54
44/45	Class 600, wafer / lug	NPS 3-36
4A / 4B	Class 150 / 300, double flanged	NPS 2-54 / 3-42

Documents and quotation

The Bray datasheet SS-1023 is attached; the page also lists the installation manual, safety manual, technical sales manual and recommended specification. Note that the 41 and 43 lug bodies allow dead-end service at full rating.

See the wider range of control and isolation valves on our catalogue, or send the model name and order number for a quotation.

Datasheets & Documents

Datasheet Bray McCannalok Series 4x High Performance Butterfly Valve datasheet SS-1023 Download

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About brand

Bray International is the Houston-based maker of butterfly valves, knife gate and slurry valves, actuators and valve controls. It was incorporated in Houston on 23 April 1986, founded by Craig C. Brown and Frank J. Raymond, and assembled its first butterfly valves in 1987. Among them were the Series 20/21, 30/31 and 35/36 resilient-seated valves that are still in its range.

Seven Star LLC is an independent supplier in Muscat. We list Bray valves, actuators, positioners and switch boxes, and supply complete automated valve packages and spare parts to water, oil and gas and process plants in Oman and the GCC.

Bray at a glance

Established	23 April 1986, Houston, Texas, by Craig C. Brown and Frank J. Raymond
First products	Series 20/21 sanitary and chemical, Series 30/31 general purpose and Series 35/36 large-diameter butterfly valves, first assembled in 1987
Product families	Resilient-seated, high-performance and triple-offset butterfly valves, knife gate and slurry valves, pneumatic and electric actuators, positioners and valve status monitors
Applications	Water and wastewater, desalination, HVAC, chemical, oil and gas, power, mining and slurry service

Bray products we list

Family	Models	Typical use
Resilient-seated butterfly valves	Series 20/21, 22/23 PTFE-lined, 30/31, 32/33, 35/36, 3A/3AH	Water, seawater, HVAC and general utility isolation; PTFE-lined for corrosive chemicals
High-performance and triple-offset butterfly valves	McCannalok 40/41, Tri Lok	Higher pressure and temperature, steam, hydrocarbons and tight shut-off
Knife gate and slurry valves	740, 755, 941, 762, 765, 767, 768	Slurries, sludge, pulp, mining tailings and wastewater solids
Actuators	Series 92/93 rack and pinion, Series 98 scotch yoke, Series 70 electric	Automating quarter-turn valves with air or electric power
Positioners and switch boxes	6A, 6P, 5A, 5C Ex d, Series 54 sensors	Modulating control and open/closed position feedback to the control system

The butterfly valve type follows the duty. Resilient-seated valves seal on a rubber liner, which makes them economical and bubble-tight for water and utilities. High-performance valves use an offset disc and a PTFE or metal seat for higher pressures and temperatures. Triple-offset valves add a third geometric offset so the disc meets the seat without rubbing, which allows a metal-to-metal, zero-leakage seal in steam and hydrocarbon service.

Where Bray valves are used

In Oman and the GCC, Bray valves and actuators are used in water transmission and distribution, desalination and wastewater plants, district cooling and HVAC, petrochemical and chemical plants, power stations and mining and slurry lines.

Ordering Bray valves: what we need

Send the series, size (NPS or DN), end connection (wafer, lug or flanged), body, disc and seat materials, and the medium, pressure and temperature. For actuated valves, add the actuator type (double-acting or spring return), air or electric supply, and any positioner or switch box needed.

Facts checked against Bray company history, October 2026.

Browse Bray International products by category: Control Valves.