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Sudmo Double Block and Bleed Butterfly Valve
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Sudmo Double Block and Bleed Butterfly Valve


The Pentair Südmo F250D/F251D hygienic double block and bleed butterfly valve integrates two butterfly disks arranged in series and independent vent/drain valves to provide safe separation of incompatible fluids (e.g. CIP and product).  This unique design enables complete isolation of the self-draining leakage cavity with one valve housing.

Südmo hygienic Double Block and Bleed Butterfly Valves’ twin discs are operated by a pneumatic actuator connected to the discs by a linkage arrangement.  The same actuator also operates pneumatic poppet valves designed to allow the introduction and draining of fluids. These innovative butterfly valves are exceptionally well suited for providing isolation and/or control in hygienic applications throughout the food, beverage, pharmaceutical, and chemical industries.


  • Linkage drive requires only one control actuator. 
  • Specially positioned poppet valves provide turbulent circular washing action and create emergency drain to atmosphere.
  • Fully machined 304L or 316L stainless steel body.
  • Failsafe pneumatic interlocks.
  • Overlapping discs minimize leakage cavity volume.
  • Actuator travel stops prevent disc contact.
  • Easily automated.


  • Food processing.
  • Dairy processing. 
  • Brewing.
  • Beverage processing.
  • Pharmaceuticals.


  • Sizes from 1” to 6” (DN 25 to DN 150).
  • Pressures from full vacuum to 1000 kPa (10 bar) at 68°F (20°C).
  • Temperatures from 14°F (-10°C) to 203°F (95°C).
  • End connections: BW, clamp, RJT, wafer flange, and others upon request.


Pentair Südmo, located in Riesbürg, Germany, has more than 60 years experience in hygienic process equipment, and an extensive range of stainless steel sanitary and aseptic valves and fittings, complete manifolds and prefabricated units for the food, dairy, beverage, pharmaceutical, chemical, and cosmetic industries.


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