Product Overview
Lightweight and durable double-offset valve with reliable performance
High-Performance Double-Offset Valve for Low-Pressure Steam Applications
The Bray/McCannalok 41R series high-performance butterfly valve is designed for the sugar industry, delivering proven reliability and extremely easy field maintenance. Independent and internal testing has demonstrated the superior lifecycle performance of Bray/McCannalok butterfly valves, achieving zero-leakage sealing for over 100,000 cycles. This valve incorporates the proven design features of standard Bray/McCannalok butterfly valves, recognized as the leading double-offset valve design for over 30 years, in a lighter and more economical configuration specifically engineered for low-pressure steam in evaporators. The valve can be used alongside standard high-pressure Bray/McCannalok butterfly valves and shares the same spare parts, reducing the need for special or different inventory. Bray/McCannalok’s exclusive patented design was awarded Chemical Processing’s Vaaler Award for Best Product shortly after its introduction. Bray/McCannalok valves can be easily automated with manual, pneumatic, or electric actuators.
Technical Specifications
| Item | Parameters |
|---|---|
| Size Range | NPS 16 to 54 / DN 400 to 1400 |
| Body Material | Phosphated Ductile Iron, Phosphated Carbon Steel |
| Temperature Range | -20°F to 500°F (-29°C to 260°C) |
| Stem Material | Stainless Steel |
| Maximum Allowable Working Pressure | 100 psi (7 bar) |
| Seat Material | RTFE |
| Shut-Off Rating | Zero Leakage |
| Disc Material | Carbon Steel with Stainless Steel Edge |
| Body Type | Lug |
| Flange Drilling | ASME B16.5 |
| Certifications | ATEX, CRN, PED, PE(S)R |
| Applications | Sugar Industry, Steam Applications |
Features and Benefits
A Stem Design
Standardized high-strength, one-piece stem design for interchangeability with Bray actuators.
B Blowout-Proof Stem
Stem locking design independent of actuator components to prevent stem ejection.
C Adjustable Stem Packing
Easy field quarter-turn adjustment without removing the actuator.
D Stem Packing System
PTFE packing rings with carbon fiber anti-extrusion ring provide continuous compression for reliable sealing around the stem. Multiple combinations available for high-temperature, high-cycle, and fire-safe applications.
E Stem Bearings
Top and bottom bearings securely support the stem, providing excellent corrosion resistance and minimizing deflection from high-temperature and mechanical loads.
F Disc
Disc is engineered to maximize flow and reduce resistance for optimum flow.
G Internal Over-Travel Stop
Designed to minimize potential seat damage and extend seat service life.
H Bidirectional Lined Seat
Provides bidirectional zero-leakage sealing while isolating the energizer from line media.
I Full-Face Seat Retainer
Prevents corrosion of socket head screws located outside the sealing area while facilitating easy seat replacement.
J Body
Extended neck allows stem packing adjustment and actuator mounting when the valve is fully insulated.
K End of Line Service
Lug and double-flanged body styles are suitable for full-rated bidirectional end-of-line service.