Flowzone Engineering Solution

Neles™ butterfly valve, series L1 and L2

The Neles Neldisc L1 and L2 series valves with triple eccentric discs are capable of functioning in both control and shut-off applications. These valves offer nearly proportional flow characteristics and exceptional sealing capability.

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  • The process’s pressure loss and energy expenses are minimized
  • The valves have the best capacity in the industry
  • They deliver consistent performance, even under the most challenging and varying process conditions
  • Maintenance hours are kept to a minimum, allowing for quick and efficient upkeep


  • The L1 valve type is a wafer-based valve, while the L2 valve type is lug-based
  • Both valve types feature a triple offset design and a two-piece shaft design
  • The pipeline uses a one-piece, full metal sealing system without any resilient parts
  • The valves boast high, long-lasting tightness that is not dependent on differential pressure
  • The patented S-disc feature delivers unique, industry-leading valve control
  • The modular design of the valves minimizes the inventory of spare parts, as the same spares can be used across multiple Neles Neldisc designs
  • The minimized actuator torque allows for a smaller actuator and reduced piping stress
  • The Neldisc triple eccentric disc valves can function in both control and shut-off applications
  • The valves have a compact and lightweight construction with a Neles B-series actuator
  • They are suitable for vacuum service and provide a tight seal even in low differential pressures
  • The valves have an extended rangeability of up to 90 degrees for control applications
  • They feature built-in thermal and pressure compensation
  • The spare part inventory is optimized
  • The valves are suitable for use in dirty and abrasive services


  • Pulp and paper
  • Water and waste water
  • Refining cooling waters
  • Oil and gas
  • Petrochemicals
  • ESD service
  • Industrial gas
  • Power generation


L1 – Wafer type
L2 – Lug type
Size range
DN 700 – 1200 / 28″ – 48″
Pressure classes
ASME 150 – 300, DIN PN 25, 40
Temperature range
-200 °C … +600 °C / -330 °F…+1110 °F


  • Technical bulletin
  • IMO, NELDISC™ Metal seated high performance triple eccentric disc valve, series L1 and L2
  • IMO, NELDISC™ metal seated butterfly valves series L16, L17, L18 and L26, L27, L28
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