The Neles Neldisc L6/LW/LG triple-offset butterfly valve covers three connection types: double-flanged, wafer and lug. Sizes are available up to 88 inches. The series features an all-metal metal-to-metal sealing design with zero-leakage performance, an operating temperature range from -200 °C to +600 °C, and an optional BAM-certified design for gaseous oxygen service. With an approximately equal-percentage flow characteristic, it is suitable for flow control and shutoff in high-temperature and large-diameter fluid transfer lines, as well as pipelines handling contaminated and abrasive media.
Neles butterfly valve, L6, LW and LG series
Neles
Neles Neldisc L6/LW/LG Triple-Offset Butterfly Valves
Triple-offset butterfly valves for throttling and isolation, with an optional configuration certified for gaseous oxygen.
- Category
- Butterfly Valves
- Size range
- L6: 3" - 88" / DN80 - DN2200; LG: 3" - 40" / DN80 - DN1000; LW: 3" - 40" / DN80 - DN1000
- Pressure class
- L6: ASME 150-600 / PN10-50; LG: ASME 150-300 / PN10-50; LW: ASME 150-300 / PN10-50
Specifications
- Valve design
- Triple-offset butterfly valve
- Connection type
- L6: double-flanged; LW: wafer; LG: lug
- Size range
- L6: 3" - 88" / DN80 - DN2200; LG: 3" - 40" / DN80 - DN1000; LW: 3" - 40" / DN80 - DN1000
- Pressure class
- L6: ASME 150-600 / PN10-50; LG: ASME 150-300 / PN10-50; LW: ASME 150-300 / PN10-50
- Operating temperature range
- -200 °C to +600 °C / -330 °F to +1110 °F
- Sealing design
- All-metal metal-to-metal seal, without elastomeric components
- Leakage performance
- Zero leakage
- Drive shaft design
- Trunnion-mounted drive shaft or through shaft; trunnion-mounted design applicable to Model D only
- Flow characteristic
- Approximately equal-percentage
- Control range
- Extended to 90 degrees
- Media compatibility
- Suitable for service involving contaminated and abrasive media
- Gaseous oxygen certification
- Optional BAM-certified design for gaseous oxygen service
Application scenarios
Control and shutoff in high-temperature media pipelines
For industrial media pipelines handling high temperatures and varying operating conditions, providing flow control and shutoff. The series supports operating temperatures up to +600 °C, uses a triple-offset all-metal metal-to-metal seal, and provides an approximately equal-percentage flow characteristic.
Control of pipelines handling contaminated and abrasive media
For process pipelines handling contaminated and abrasive media, providing control or shutoff. Product documentation explicitly specifies suitability for service involving contaminated and abrasive media, and the valves use an all-metal metal-to-metal sealing design without elastomeric components.
Control and shutoff in gaseous oxygen pipelines
For flow control and shutoff in gaseous oxygen transfer and process control pipelines. The series is available with an optional BAM-certified design for gaseous oxygen service.
Flow control in large-diameter fluid transfer pipelines
For flow control and shutoff in large-diameter industrial fluid transfer pipelines. The L6 double-flanged design is available in sizes up to DN2200 and provides an approximately equal-percentage flow characteristic with a control range extended to 90 degrees.
Selection points
All-metal metal-to-metal sealing design
The L6, LW and LG series use an all-metal metal-to-metal seal without elastomeric components and provide zero-leakage performance across an operating temperature range from -200 °C to +600 °C.
Triple-offset design with an approximately equal-percentage flow characteristic
The L6, LW and LG series feature a triple-offset design with an approximately equal-percentage flow characteristic, a control range extendable to 90 degrees, and suitability for control and shutoff service.
Multiple valve body connection types and corresponding size ranges
The product is available with L6 double-flanged, LW wafer and LG lug connections. L6 sizes range from DN80 to DN2200, with pressure classes of ASME 150 to 600 or PN10 to PN50. LW and LG sizes range from DN80 to DN1000, with pressure classes of ASME 150 to 300 or PN10 to PN50.
Installation notes
Use a dedicated certified design for gaseous oxygen service
For gaseous oxygen service, confirm that the valve is configured with a BAM-certified design suitable for gaseous oxygen.
FAQ
What services are Neles Neldisc L6, LW and LG series butterfly valves suitable for?
They are suitable for throttling and isolation service in applications including biotechnology, geothermal, pulp and paper, water and wastewater treatment, refining, oil and gas, petrochemicals, ESD, industrial gases, power generation, and food and beverages.
How do the designs of the L6, LW and LG series differ?
L6 is double-flanged, LW is wafer, and LG is lug type. All three use a triple-offset design.
What are the size and pressure class ranges of Neles Neldisc butterfly valves?
L6 sizes range from 3 to 88 inches (DN80 to DN2200), with pressure classes ASME 150-600 and PN10-50. LW and LG sizes both range from 3 to 40 inches (DN80 to DN1000), with pressure classes ASME 150-300 and PN10-50. The specific configuration must be confirmed based on the actual model and service conditions.
What is the temperature range of Neles Neldisc butterfly valves?
The temperature range is -200 °C to +600 °C (-330 °F to +1110 °F). The specific configuration must be confirmed based on the actual model and service conditions.
What sealing design do Neles Neldisc butterfly valves use?
They use an integrated fully metallic seal and a genuine metal-to-metal seal, eliminating the need for elastomeric components in the pipeline and providing built-in thermal and pressure compensation.