Product reliability and performance are directly related to quality and a major concern of any customer who must have the assurance they are receiving products as designed, with a material and quality level that meets or exceeds their requirements.
Bray/McCannalok High Performance Butterfly Valve


SIZE RANGE: 2 1/2" - 66" (65mm - 1650mm)
BODY STYLE: Wafer, Lug and Double Flanged
TEMPERATURE RANGE: -62°F to 500°F (-52°C to 260°C)
PRESSURE RATINGS: ASME Class 150, 300 and 600
BODY MATERIALS: Carbon Steel, Stainless Steel, Nickel Aluminum Bronze
DISC/STEM MATERIALS: Stainless Steel, Nickel Aluminum Bronze
STEM MATERIALS: Stainless Steel, Monel K500
SEAT MATERIALS: Standard - RTFE with Resilient Energizer, PTFE with Resilient Energizer Fire Safe - RTFE and Inconel with Resilient Energizer
APPLICATIONS: High Pressure, High Temperature, Critical Service






The Bray/McCannalok high performance butterfly valve's innovative design offers rugged reliability and extremely easy maintenance in the field. Independent and internal tests prove Bray/McCannalok’s superior service life capability, with zero leakage shutoff. The Bray/McCannalok High Performance Valve delivers the highest quality and highest value available for meeting today’s demanding requirements.

Available with proven bi-directional fire safe seats for reliable control of flammable and hazardous fluids in petroleum, petrochemical, chemical and other high-risk applications.The fire safe design combines superior performance, extended service life and compliance with the most demanding worldwide fire-test standards – before, during and after a fire!

The Bray/McCannalok’s unique, patented design received Chemical Processing’s Vaaler Award for Best Product shortly after it was introduced. The simple, innovative design offers rugged reliability and extremely easy maintenance in the field. Independent and internal tests have proven Bray/McCannalok’s superior service life capability, with zero leakage shutoff through over 100,000 cycles. The Bray/McCannalok valves can be automated inexpensively with Bray’s pneumatic and electric actuators. The Bray/McCannalok High Performance Valve delivers the highest quality and highest value available for your requirements.

After a test of over 100,000 cycles at 720 psi, the seat remained in excellent condition, continuing to provide a bi-directional zero leakage seal. Even after more than 878,000 cycles at 2 psi, the Bray/McCannalok High Performance Valve still sealed zero leakage in both directions.

Series 40/41 Callouts[A] STEM: The high-strength, one piece stem is 17-4 PH Stainless Steel. The valve stem is standardized for interchangeability of Bray actuators. 

[B] BLOW-OUT PROOF STEM: A retaining ring is installed between the machined stem groove and gland retainer step. 

[C] ADJUSTABLE STEM PACKING: The stem packing system features easy access to adjusting hex head nuts without requiring removal of the actuator. The system consists of a gland ring, a gland retainer, studs, hex head nuts and lock washers. A 1/4 turn of the hex head nuts is usually all that is required should field adjustment ever be needed. Both hex head nuts must be evenly adjusted and not overtightened. 

[D] STEM SEAL: The stem seal system provides constant compression for a positive seal around the stem. PTFE packing seals the stem and a carbon fiber anti–extrusion ring contains the packing. Flexible graphite rings are available for high temperature applications and are standard on fire safe valves. 

[E] STEM BEARINGS: Top and bottom bearings, consisting of a 316 Stainless Steel shell with a TFE/glass fabric liner bearing surface securely support the stem. The stem bearings provide excellent resistance to corrosion and distortion from high temperatures and mechanical loading forces. 

[F] TAPER PINS: Taper pins are precision fit into reamed holes. 

[G] DISC: The disc has been engineered to maximize flow and minimize resistance providing a high Cv. Stainless Steel is standard. 

[H] INTERNAL TRAVEL STOP: Designed to prevent travel of the disc and minimizing possible seat damage, therefore extending the service life of the seat. 

[I] RESILIENT SEAT: Energizer encapsulated in RTFE 

[J] FULL-FACED SEAT RETAINER: Retainer is firmly attached by bolts located outside of sealing area, protecting the bolts from corrosion. 

[K] BODY: All body styles offer bi-directional sealing as standard to full ASME Class 150, 300 or 600 ratings. Extended neck allows for 2" of pipeline insulation and easy access to stem packing adjustments and actuator mounting.

Bray/McCannalok valves can be optionally supplied in a number of different seat and body materials including:

  • PTFE and UHMWPE seats with resilient energizer.
  • Fluorosilicone inner O-rings for methylene chloride service.
  • Fire Safe graphite/carbon fiber or similar packing for fire safe or high temperature service
  • Hastelloy C bodies for hydrogencyanide service.
  • Nickel Aluminum Bronze bodies for marine environments.
  • Longer stem lengths to accommodate differing control devices.
  • Alloy 20 trim for sulfuric acid service.
  • Monel discs for Chlorine service.
  • Duplex,Super Duplex and Super Austenitic Stainless trims for salt water services.

Many other materials are also available. Please consult your Bray representative.
Document Type Download
Sales Brochure - Bray/McCannalok Butterfly Valves PDF
Technical Manual - Bray/McCannalok PDF
Operations & Maintenance Manual - Bray/McCannalok PDF
Safety Manual - Bray/McCannalok PDF
Typical Flange Bolting with Washers PDF
Typical Flange Bolting without Washers PDF
Bray/McCannalok Recommended Specifications - Detailed PDF
Bray/McCannalok Recommended Specifications - Summary PDF
Series 40/41 Sales Reference Drawings PDF
Series 42/43 Sales Reference Drawings PDF
Series 44/45 Sales Reference Drawings PDF
Series 4A Sales Reference Drawings PDF
Series 4B Sales Reference Drawings PDF
Double Offset Sales Reference Drawings PDF


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