Butterfly valve seals

Butterfly valve seals

Hygienic and fully functional - even after countless switching processes – butterfly valve seals from Freudenberg Process Seals ensure a reliable and durable tight seal in butterfly or disk valves.

The seal for butterfly valve is an indispensable component to seal off all three possible leakage routes - the pipe seal, the flange seal and the operating shaft seal in shut-off valves, flap or disk valves and should therefore be designed and made of material optimal for these applications. Our sealing solutions offer material quality precisely selected for this and torque reduced geometries which allow the flap to close with a minimal amount of power, yet demonstrate high compression to provide a perfect seal. Designs leak-free and dead space-free ensure applications remain hygienic - especially for the food and beverage industry.

A summary of the advantages

  • Patented torque reduced design allows high switching cycles with low switching forces and minimized wear
  • Very easy to install
  • Designs without dead space
  • Friction reducing coatings available
  • Wide range of material designs for high media and temperature stability

Shutting off pipelines

  • Suitable for the popular pipe dimensions according to DIN and ISO
  • Standard metric sizes DN 15 to DN 250
  • Standard inch sizes 1“ to 6“
  • Individual dimensions on request

Types

  • Structural shapes can be designed customer-specifically using FEM calculations
  • Special designs with additional coating (e.g. RFNTM)

Beverage industry

  • Use of material type EPDM
  • Thermal stability in steam and sterilization up to 140 °C, briefly up to 160 °C
  • Suitable for aqueous media and cleaning processes
  • The material used can be individually adapted for extreme applications. Please contact Freudenberg Process Seals.

Dairy Farming

  • Use of material types EPDM, VMQ or HNBR depending on fat content and temperature
  • Due to the material used, HNBR, FKM and VMQ do not attain the durability of the material EPDM in several cleaning media, but in contrast to EPDM, are grease resistant and therefore also suitable at high temperatures and concentrations.

Pharmacy

  • FKM is stable in several oils and some aromatic oils, however it has limited use in some cleaning media. It swells more in acids and peracetic acid, therefore when using FKM, suitable cleaning media should be used
  • Select the use of material types EPDM, FKM, VMQ and HNBR depending on the ingredients and solvents
  • Several applications in flavor manufacturing, pharmaceuticals and the chemical industry exceed the stability values of EPDM, VMQ and HNBR. In these cases, Freudenberg Process Seals recommends the use of Fluoroprene® XP or Simriz® (FFKM)
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