Wafer 51 Butterfly Valve

Design Features

  • One piece body with extended neck allows clearance for flanges up to 2-1/2″ of insulation
  • Primary stem seals are formed by preloaded contact between the disc and seat. A secondary seal is effected by havign a stem diameter greater than the stem hole in resilient seat. These seals provide a non-wetted body and stem, eliminating the need for corrosion resistant body materials.
  • Field replaceable, phenolic bonded cartridge is blowout proof, stretch resistant and non-callapsible, making it an ideal seat design for high veloicyt or vacuum service. Our resilient seat design eliminates the need for flange gaskets. Valve sizes 16″ and above are supplied with metal seat back up rings.
  • High strength, square drive ensures a positive shaft to disc connection
  • Square drive offers direct ISO mounting of gear operator and automation equipment
  • Disc floats inside the seat for positive sealing and extended seat life
  • No pins or bolts exposed to flow
  • Offset shaft retainers mechanically retain the shaft in the body ensuring a blow out proof stem design

Application Datasheet – Fill Out and Return for Accurate Quote



  • Body Style: Wafer Body with Two Piece Stem Design
  • Body Material: Ductile Iron with High Quality Epoxy Coating
  • Seat Material: Buna-N (NBR), EPDM, Viton, Neoprene, Hypalon, Silicon, PTFE
  • Size Range: 2″ – 36″
  • Temperature Range: -70°F – 425°F
  • Pressure Rating:
    • 2″ -12″ – 200 WOG – Bi-Directional Flow
    • 14″ – 24″ 175 WOG – Bi-Directional Flow
    • 250 WOG -Uni-Directional Flow -OPTIONAL
  • Applications: Ideal Butterfly Valve for Automation and Demanding Manual Applications offering longer service life, greater reliability, ease of parts replacement, and interchangeability of components.

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