The Neles Neldisc L1/L2 series is a large-diameter, three-offset butterfly valve available with L1 wafer and L2 lug-type connections, designed for throttling and shutoff service. The valve features integral all-metal sealing, an operating temperature range of -200 °C to +600 °C, high sealing performance at low differential pressure, and vacuum compatibility. Its near equal-percentage flow characteristic makes it well suited for large-diameter industrial pipelines handling contaminated or abrasive media, as well as vacuum-service pipelines in the process industries.
Neles butterfly valves, L1 and L2 series
Neles
Neles Neldisc L1/L2 Triple-Offset Butterfly Valve
Triple-offset butterfly valve for throttling and isolation, compatible with vacuum service.
- Category
- Butterfly Valves
- Nominal Size Range
- DN 700 - 1200 / 28" - 48"
- Pressure Rating
- ASME 150 - 300; DIN PN 25, 40
Specifications
- Valve Type
- Triple-offset butterfly valve
- Connection Type
- L1 wafer; L2 lug-style
- Nominal Size Range
- DN 700 - 1200 / 28" - 48"
- Pressure Rating
- ASME 150 - 300; DIN PN 25, 40
- Operating Temperature Range
- -200 °C … +600 °C / -330 °F … +1110 °F
- Service
- Throttling and isolation
- Flow Characteristic
- Approximately equal-percentage
- Seat Design
- Integrated all-metal seat; no elastomeric components
- Low Differential Pressure Sealing Capability
- Suitable for high-sealing-performance service under low dp conditions
- Vacuum Compatibility
- Suitable for vacuum service
- Media Compatibility
- Suitable for contaminated and abrasive media
Application scenarios
Large-Diameter Industrial Pipelines for Contaminated or Abrasive Media
For flow control and isolation in large-diameter industrial pipelines carrying contaminated or abrasive media. This series is specifically suitable for contaminated and abrasive media and provides an approximately equal-percentage flow characteristic together with throttling and isolation capability.
Vacuum-Service Pipelines in the Process Industries
For flow control and isolation in process-industry pipelines requiring vacuum compatibility. This series is specifically suitable for vacuum service and supports throttling and isolation applications.
Selection points
Integrated All-Metal Seat Design
The valve uses an integrated all-metal seat without elastomeric components, making it suitable for low differential pressure and vacuum service.
Suitable for Contaminated and Abrasive Media
The valve uses an all-metal seat design and is suitable for contaminated and abrasive media.
Installation notes
Match Actuator Closing Torque and Travel Limits
This series uses an integrated all-metal seat design. During installation and commissioning, verify the actuator fully closed travel limit and closing torque according to the manufacturer's requirements for the specific model. This helps prevent abnormal loading or damage to sealing components caused by improper travel or torque adjustment.
FAQ
What control tasks are Neles Neldisc L1 and L2 three-offset butterfly valves suitable for?
The Neles Neldisc L1 and L2 series is suitable for throttling and shutoff service, featuring a near equal-percentage flow characteristic and extendable to 90-degree control applications. Its stable performance makes it suitable for applications with demanding and continuously changing process conditions.
What is the difference between the L1 and L2 series butterfly valves in terms of connection type?
The L1 series features a wafer-style design, while the L2 series features a lug-style design. Final selection should be based on the pipeline connection configuration, available valve installation space, and project specifications.
Why is this three-offset butterfly valve suitable for low differential-pressure and vacuum service?
The series uses integral all-metal sealing, with no resilient components required inside the pipeline, and provides thermal and pressure compensation. Its sealing performance does not depend on differential pressure, allowing it to maintain high sealing performance under low-dp conditions while also supporting vacuum service.
What are the size range, pressure ratings, and temperature range of the Neles Neldisc L1 series?
The L1 series is available in DN 700 to DN 1200 (28 to 48 in), with pressure ratings including ASME 150 to 300 and DIN PN 25 and PN 40. The temperature range is -200 °C to +600 °C. The specific configuration must be confirmed according to the actual model and service conditions.
What features do the L1 and L2 butterfly valves offer for maintenance and spare-parts management?
The L1 and L2 series uses a modular design, allowing the same spare-parts set to be used for multiple Neles Neldisc designs and helping optimize spare-parts inventory. The three-offset design can reduce actuator torque, support the use of smaller actuators, and reduce pipeline stress, while also helping shorten maintenance time.