The Neles BWX Series cryogenic butterfly valve features a CrNi steel body and a free-floating metal seat. It is an industrial valve designed specifically for extreme temperatures from -200 to +470 °C. The series offers pressure ratings up to ASME 600/PN63, sizes from DN100 to DN600, cold shock testing, and an optional grease-free assembly version. Applications include cryogenic LNG storage and transfer, oxygen process pipelines in air separation units, and cryogenic hydrogen processing and transfer systems.
Neles butterfly valve, BWX Series
Neles
Neles BWX Series Cryogenic Butterfly Valve (CrNi Steel)
Cryogenic metal-seated butterfly valve for LNG and oxygen pipelines
- Category
- Butterfly Valves
- Operating Temperature Range
- -200 to +470 °C / -320 to +880 °F
- Pressure Rating
- ASME 600 / PN63
Specifications
- Operating Temperature Range
- -200 to +470 °C / -320 to +880 °F
- Pressure Rating
- ASME 600 / PN63
- Connection Size Range
- NPS4 … NPS24 / DN100 … DN600
- Face-to-Face Dimension Standard
- API 609, optional EN558
- Body Material
- CrNi steel
- Seat Type
- Free-floating metal seat
- Suitable Media
- Gaseous and liquid oxygen, LNG, nitrogen, hydrogen, and other cryogenic fluids
- Cryogenic Testing
- Cold shock testing
- Assembly Requirements for Oxygen Service
- No grease is used during assembly and testing
Application scenarios
Cryogenic LNG Storage, Transfer, and Transmission Systems
For cryogenic LNG pipelines and related storage and transfer equipment. The BWX Series is designed specifically for cryogenic applications and is explicitly suitable for LNG. It features a free-floating metal seat, cold shock testing, and optional cryogenic extension stems in different lengths.
Oxygen Process Pipelines in Air Separation Units
For cryogenic processing and transfer pipelines carrying gaseous or liquid oxygen in air separation units. The BWX Series is explicitly suitable for gaseous and liquid oxygen, and no grease is used during assembly and testing for oxygen service.
Cryogenic Hydrogen Processing and Transfer Systems
For pipelines used to store, transfer, or process cryogenic hydrogen. The BWX Series is explicitly suitable for hydrogen, features a CrNi steel body and a free-floating metal seat, and undergoes cold shock testing.
Selection points
Free-Floating Metal Seat Design
The protected free-floating metal seat reduces seat tearing and wear for cryogenic fluid service.
Grease-Free Assembly and Testing for Oxygen Service
For oxygen service, assembly and testing are performed without grease, and non-metallic components undergo AM testing.
Cryogenic Cold Shock Testing
Valve testing includes cold shock testing to verify suitability for cryogenic fluid service.
Cryogenic Fluid Compatibility
Suitable for gaseous and liquid oxygen, LNG, nitrogen, hydrogen, and other cryogenic fluids, with an operating temperature range of -200 to +470 °C.
Pressure Ratings and Face-to-Face Dimension Standards
Pressure ratings are ASME 600 or PN63. Face-to-face dimensions comply with API 609, with EN558 available as an option.
Installation notes
Preventing Grease Contamination in Oxygen Service
When used with gaseous or liquid oxygen, grease must not be introduced during assembly, installation, or maintenance. The relevant processes must remain grease-free.
Matching Flange Connections and Structural Dimensions
Before installation, verify the valve pressure rating, flange sealing surface, and face-to-face dimensions to ensure compatibility with ASME 600 or PN63, API 609 or the selected EN558 standard, and the site pipeline.
Confirming the Cryogenic Extension Stem Configuration
Before installation, confirm the configuration and length of the cryogenic extension stem based on the site cryogenic pipeline and available installation space, then install it correctly according to the actual configuration.
FAQ
Which cryogenic media and service conditions are suitable for Neles BWX Series butterfly valves?
Neles BWX Series high-performance butterfly valves are designed for cryogenic applications and can be used with gaseous and liquid oxygen, LNG, nitrogen, hydrogen, and other cryogenic fluids. The applicable temperature range is -200 to +470 °C. Specific selection must be confirmed based on the actual media, temperature, pressure, and application conditions.
Why is the BWX Series butterfly valve suitable for oxygen service?
The series uses a free-floating metal seat with a protected seat structure to reduce tearing and wear. No grease is used during assembly and testing, and non-metallic components undergo AM testing. These features make it suitable for oxygen-related service. Before actual application, the specific model and configuration must still be confirmed against the system operating conditions.
How should a BWX Series butterfly valve be selected based on pipeline size and connection standards?
The BWX Series is available in sizes from NPS4 to NPS24, corresponding to DN100 to DN600. Face-to-face dimensions comply with API 609, with EN558 also available as an option. During selection, verify the pipeline nominal size, available face-to-face installation space, flange sealing surface, and the standards adopted for the project.
What are the pressure ratings and temperature range of Neles BWX Series butterfly valves?
The series has pressure ratings of ASME 600 or PN63 and a temperature range of -200 to +470 °C. For cryogenic media, oxygen, or other severe service conditions, the media state, operating pressure, temperature variation, and pipeline system conditions should be evaluated together.
How should the extension stem be selected when installing a BWX Series butterfly valve in a cryogenic pipeline?
The BWX Series offers cryogenic extension stems in different lengths to meet cryogenic pipeline operation and installation requirements. The stem length should be confirmed based on the insulation structure, valve installation position, operational accessibility, and actual cryogenic service conditions.