Neles® Series B1

For use in both modulating control and on-off service. Metso’s Neles® double acting and spring return B1-series piston type quarter turn actuators are designed for use in both modulating control and on-off service. These actuators offer an extremely long cycle life and are well suited to operate almost any type of rotary valve.

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  • Wear and corrosion resistant design
  • Safe and easy maintenance
  • Suitable for various services, from control to demanding ESD and arctic conditions
  • Vast number of optional features
  • Rugged design
  • Wide torque range
  • Type approval according to EN 15714-3


  • Long cycle life
  • Fast and sensitive response
  • Unified design through the whole product range
  • Proven reliable design


  • Emergency shutdown
  • Compressor anti-surge
  • High cycle control and on-off applications
  • High precision control
  • Arctic service


  • Type:     Pneumatic cylinder actuator
  • Series:  B1C – double action, B1J – spring return
  • Supply Pressure:              2.8 – 10 bar
  • Torque Range:   28 – 100000 Nm
  • Temperature Ranges:    -55 to +120 °C
  • Protection Class:               IP66, IP67 (IEC 60529)
  • ATEX class:          Ex II 2G/D c IIC TX
  • Mounting Face: ISO 5211, VDI/VDE 3845