The Bray 41R Series is a double-offset butterfly valve for sugar production steam systems, with nominal sizes ranging from NPS 16 to 54 (DN 400 to 1400), a lug-style body, and ASME B16.5 flange drilling. The RTFE seat provides bidirectional bubble-tight shutoff for operating conditions up to 7 bar and -29°C to 260°C, with manual, pneumatic, or electric actuation options. This valve is suitable for isolation and automated on/off control in low-pressure steam lines serving sugar mill evaporators.
41R Series high-performance butterfly valve product image
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Bray 41R Series Double-Offset Butterfly Valve for Sugar Processing Steam
Double-offset butterfly valve for low-pressure steam isolation in sugar evaporators, compatible with automated actuation.
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Specifications
- Valve type
- Double-offset high-performance butterfly valve
- Nominal size range
- NPS 16 to 54 / DN 400 to 1400
- Maximum allowable operating pressure
- 100 psi (7 bar)
- Operating temperature range
- -20°F to 500°F (-29°C to 260°C)
- Body material
- Phosphated ductile iron, phosphated carbon steel
- Disc material
- Carbon steel with stainless steel edge
- Stem material
- Stainless steel
- Seat material
- RTFE
- Leakage class
- Zero leakage
- Sealing direction
- Bidirectional zero-leakage sealing
- Body type
- Lug-style
- Flange drilling standard
- ASME B16.5
- Actuation
- Manual, pneumatic, or electric actuator
- Certifications
- ATEX, CRN, PED, PE(S)R
Application scenarios
Low-Pressure Steam Isolation and Control for Sugar Evaporators
Used for steam shutoff or automated on/off control in low-pressure steam lines serving sugar mill evaporators. The 41R series is specifically designed for low-pressure steam service in evaporators and features a double-offset design and RTFE seat to provide bidirectional zero-leakage sealing.
Selection points
Configuration for Low-Pressure Steam in Sugar Mill Evaporators
The 41R Series features a lighter and more economical configuration for low-pressure steam applications in sugar mill evaporators, with a maximum allowable operating pressure of 100 psi (7 bar).
Shared Spare Parts with Standard High-Pressure McCannalok Series
The 41R Series can be used with standard high-pressure Bray/McCannalok butterfly valves and shares the same spare parts, helping reduce inventory requirements for different spare-part categories.
Large-Diameter Bidirectional Zero-Leakage Sealing
The valve covers NPS 16 to 54 (DN 400 to 1400), featuring a double-offset design and bidirectional zero-leakage sealing. Product documentation states that zero-leakage sealing is maintained after more than 100000 cycles.
Lug-Style Valve Body with ASME B16.5 Flange Interface
This series features a lug-style valve body with flange drilling compliant with ASME B16.5, enabling installation with the corresponding flange interface.
Material Configuration for Steam Applications
This series is available with a phosphated ductile iron or phosphated carbon steel valve body, a carbon steel disc with stainless steel edges, a stainless steel stem, and an RTFE seat.
Installation & maintenance notes
Verify Pressure and Temperature Conditions Before Installation
This valve is intended for steam applications in the sugar industry. Before installation, confirm that the actual operating pressure does not exceed 100 psi (7 bar) and that the operating temperature is within the range of -29°C to 260°C.
FAQ
How does the 41R Series butterfly valve work?
The 41R Series uses a double-offset design to reduce flow resistance by offsetting the disc from the flow path. The stem packing system provides continuous sealing, while optional actuators enable automation for zero-leakage sealing and stable operation under low-pressure steam conditions. The specific configuration must be confirmed based on the actual model and application conditions.
What are the technical advantages of this series in low-pressure steam applications?
The valves in this series are known for their lightweight design, durability, and maintainability. They provide long-life sealing performance, tested to achieve zero-leakage sealing for more than 100,000 cycles, and share spare parts with high-pressure Bray/McCannalok valves, reducing inventory complexity and maintenance costs. The specific configuration must be confirmed based on the actual model and application conditions.
Which parameters should be prioritized during selection to ensure compatibility?
Key parameters include the size range (NPS 16 to 54 / DN 400 to 1400), maximum allowable operating pressure, body material, seat material, temperature range, and flange drilling (ASME B16.5). Final model selection must be based on the actual operating conditions.
What are the key installation and maintenance considerations for the 41R Series?
Automation can be achieved using manual, pneumatic, or electric actuators. The stem packing can be adjusted in the field without removing the actuator, facilitating on-site maintenance. The body design and sealing structure support stable operation under steam service conditions. The specific configuration must be confirmed based on the actual model and application conditions.
How is this series related to existing high-pressure Bray/McCannalok butterfly valves?
The 41R Series retains the proven design of Bray/McCannalok butterfly valves and can be used alongside existing high-pressure series valves. It uses the same spare parts, reducing the need for special inventory. Specific compatibility must be confirmed based on the actual model.
Documents
Product Brochure—McCannalok™ 41R High-Performance Butterfly ValveProduct information · EnglishBolting Guide—Typical Flange Bolting Guide with WashersProduct information · EnglishBolting Guide—Typical Flange Bolting Guide without WashersProduct information · EnglishIOM Manual—McCannalok™ Series High-Performance Butterfly ValvesManual · EnglishSafety Manual—McCannalok™ 4X Series High-Performance Butterfly ValvesManual · English