The Neles BW Series metal-seated double-offset butterfly valve includes short- and long-pattern flanged designs, with pressure ratings up to ASME Class 2500 and suitability for extreme temperatures from -200 to +470 °C. The valve features a single U-shaped solid metal seat and a two-piece shaft design, meets the ISO 15848 fugitive emissions standard, and supports on-site seat replacement. It is designed for refining, petrochemical, and power generation systems, and is suitable for control and tight shutoff in pipelines handling severe high-temperature, high-cycle, or abrasive media.
Neles BW Series butterfly valve
Neles
Neles BW Series Metal-Seated Double-Offset Butterfly Valve
Metal-seated double-eccentric butterfly valve for high-pressure, high-temperature process control and tight shutoff.
- Category
- Butterfly Valves
- Pressure rating
- PN 63 - 400 / ASME Class 600 - 2500
- Nominal size
- DN 100 - 1600 / 4" - 64"
Specifications
- Valve type
- Metal-seated double-eccentric butterfly valve
- Body configuration
- Short and long flanged configurations
- Pressure rating
- PN 63 - 400 / ASME Class 600 - 2500
- Nominal size
- DN 100 - 1600 / 4" - 64"
- Operating temperature range
- -200 to +470 °C / -320 to +880 °F
- Seat design
- Solid single U-type metal seat with metal-to-metal sealing
- Design standards
- API 609, ASME B16.34
- Fugitive emissions standard
- ISO 15848
- Functional safety level
- Compliant with IEC61508, capable of achieving SIL 3
- Fire-safe certification
- API 607 6th edition
- Mounting interface standard
- ISO 5211
- Shaft configuration
- Two-piece shaft design
- Seat maintenance method
- In-line seat replacement without removing the disc or shaft
Application scenarios
Control and shutoff in severe process pipelines for refining and petrochemical facilities
Used in severe process pipelines in refining and petrochemical facilities for process media control and tight shutoff. The series is designed for high-pressure applications and uses a metal-seated double-offset design with metal-to-metal sealing to handle complex and changing process conditions.
Control and shutoff in high-temperature process media pipelines in power generation systems
Used in high-temperature process media pipelines in power generation systems where flow control and tight shutoff are required. The series is suitable for power industry applications, and its metal-seated double-offset design supports operating temperatures up to +470 °C.
Control of pipelines carrying high-cycle and abrasive media
Used in severe process pipelines carrying high-cycle or abrasive media for process control and shutoff. The series provides extended service life for high-cycle and abrasive applications and supports on-site seat replacement to reduce maintenance hours.
Selection points
High-pressure metal-seated double-offset butterfly valve platform
The BW Series is a metal-seated double-offset butterfly valve with pressure ratings covering PN 63-400 and ASME Class 600-2500. It is suitable for control and shutoff applications in severe conditions across refining, power generation, petrochemical, and chemical industries.
Single U-shaped solid metal seat and metal-to-metal sealing
The valve uses a single U-shaped solid metal seat and metal-to-metal sealing. Product documentation indicates suitability for high-cycle, high-temperature, and abrasive applications.
Combined control and tight shutoff
The BW Series is designed for control and tight shutoff under severe operating conditions, allowing process control and shutoff functions to be combined on the same valve platform.
On-site seat replacement without removing the disc and shaft
The seat can be replaced on site without removing the disc and shaft during maintenance, helping reduce maintenance hours.
Compliance with fugitive emissions, functional safety, and fire safety requirements
The product complies with the ISO 15848 fugitive emissions standard and IEC 61508 requirements, can achieve SIL 3, and is certified for fire safety in accordance with API 607 6th edition.
Installation notes
Verify the pressure rating of the pipeline connection
Before installation, verify that the pressure rating of the mating flange or pipeline connection at the site matches the actual valve configuration. The valve must not be operated beyond its confirmed pressure rating range.
FAQ
What sealing principle does the Neles BW Series butterfly valve use, and is it suitable for tight shutoff?
The Neles BW Series uses a solid metal seat and a metal-to-metal contact sealing design to achieve tight sealing without relying on resilient sealing elements. The design is intended for control and shutoff under severe operating conditions and incorporates thermal and pressure compensation to accommodate complex and changing process conditions.
How should the pressure rating, size, and temperature range of the Neles BW Series butterfly valve be selected?
Selection should consider the pipeline pressure rating, nominal size, media temperature, and control or shutoff conditions. The series has valve body pressure ratings from PN 63 to PN 400 and ASME Class 600 to Class 2500, a size range of DN 100 to DN 1600 (4 to 64 inches), and an operating temperature range of -200 to +470 °C. The specific configuration must be confirmed according to the actual model and application conditions.
What are the application advantages of the Neles BW Series compared with conventional soft-seated butterfly valves?
The BW Series uses a metal seat and double-offset design, making it suitable for high-temperature, high-cycle, and abrasive service, as well as stable control and tight shutoff in high-pressure applications. Its low pressure drop, wide rangeability, and high flow capacity help reduce process pressure loss and associated energy consumption.
What industrial applications is the Neles BW Series butterfly valve suitable for?
The series is suitable for chemical processing, refining, petrochemical, offshore platform, steel mill gas, natural gas, power generation, and fertilizer applications. For systems involving high temperatures, high cycles, abrasive media, or continuously changing process conditions, the specific model should be confirmed based on media characteristics, pressure and temperature conditions, and control requirements.
What structural maintenance advantages does the Neles BW Series butterfly valve offer?
The series is equipped with a heavy-duty stem and bearing design that can reduce the impact of thermal cycling and contaminants on service life. The seat can be replaced on site without removing the disc and shaft, and without adjustment or special tools, helping reduce maintenance hours. The mounting interface complies with ISO 5211, facilitating configuration with compatible actuators.