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Keystone OptiSeal Figure 14/15/16/17 Butterfly Valves

Resilient seated design with PTFE options for chemical, food and general industrial processes needing tight shutoff.

Keystone OptiSeal Figure 14/15/16/17 resilient seated butterfly valves are designed for general purpose, food and beverage processing, industrial applications and chemical applications when configured with a PTFE lined seat, disc and stem.

Principales fonctionnalités

  • Top bushing absorbs actuator side thrust loads.
  • Actuator flange acc. ISO 5211.
  • High solid, glossy, silicone free, paint system ensuring excellent corrosion resistance.
  • Extended body neck allows pipe insulation.
  • Body locating holes ease installation and centering between the flanges.
  • Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and bubble-tight shut-off.
  • The seat is field replaceable and fully isolates the body and stem from the flow.
  • Primary stem sealing exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
  • A secondary shaft sealing provides back‑up safety.
  • No flange gaskets required.
  • High Cv value.
  • Top and bottom shaft bearings for optimized support and minimum friction in all body materials up to DN 300, except cast iron.


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