Flowzone Engineering Solution

Neles™ high cycling butterfly valve, series BO

The Neles BO series butterfly valve is specifically engineered for Vacuum Pressure Swing Adsorption plants (VPSA). This high-performance valve features a single eccentric disc, soft seating, and a wafer type design. Its robust construction allows for maximum endurance in fast cycling applications, while maintaining long-lasting tight shut-off capability and excellent flow characteristics. The BO series valve can also maintain internal tightness for up to 2 million cycles, making it a reliable choice for VPSA operations.

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  • Industry-leading valve capacity
  • Designed for use with wet and dirty media
  • Simple and fast maintenance
  • Ensures secure valve operation for maximum availability


  • High-capacity enabled by 2-piece shaft design
  • Aluminum disc hardened to decrease mass moment of inertia
  • Long-lasting quadruple bearings that can endure up to 2 million cycles
  • Bi-directional bubble-tight construction with soft sealing
  • Cartridge bearing design for easy maintenance
  • Available in sizes up to NPS40 / DN1000
  • Encapsulated sealing element design for trouble-free opening and closing
  • Switching time of less than one second for optimal process efficiency
  • Quadruple bearings ensure maximum cycle lifetime and prevent jamming


Size range
DN 200 – 1000 / 8″ – 40″
Temperature range
upto 200 ºC
Pressure rating
PN 10 – 16 / ASME Class 150


  • Technical bulletin
  • Installation, maintenance and operation manual
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