Neles™ butterfly valve, series BW

Problem solver for high pressure applications


Neles BW series metal seated double eccentric disc valve is designed for both control and tight shut-off in severe service. Multiple seat options makes it well suited for the refining, power, petrochemical and chemical industries. The BW series provides extended operational life in high cycle, high temperature and abrasive applications.

Low cost of ownership

Minimized pressure loss and energy costs of the process

Consistent performance even in the most difficult, changing process conditions

Shortest possible maintenance hours


  • Solid metal seat design, based on metal-to-metal contact.
    No resilient components needed for tightness
  • Excellent control and on-off capabilities
  • Design according to API 609 and ASME B16.34
  • Low emissions according to ISO 15848
  • Certified safety performance, capable to SIL 3 level according to IEC61508
  • Mounting face according to ISO 5211
  • Extremely wide temperature range up to +470 °C / +880 °F
  • Fire safe certification according to API 607, 6th edition
  • Wide rangeability in services with low pressure drop
  • Two piece shaft design
  • Industry best valve capacity
  • In-built thermal and pressure compensation
  • Heavy-duty stem and bearings design extends service life and is insensitive to thermal cycles and impurities
  • Industry smallest operational torque resulting in cost efficient valve package
  • On site interchangeable seat can be replaced without disassembling the disc and shaft. No adjustment or special tools needed


  • Chemical processes
  • Refinery
  • Petrochemical
  • Off-shore
  • Steel mills gas services
  • Natural gas
  • Power generation
  • Fertilizers


Body constructions:

Flanged short and long pattern


Lug and wafer design


Butt weld ends

Body pressure rating: PN 63 - 400 / ASME Class 600 - 2500
Seat design: Single U-type metal seat
Size range: DN 100 - 1600 / 4" - 64"
Temparature: -200 to +470 °C / -320 to +880 °F