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BUTTERFLY VALVES: SEAT MATERIALS

TEFLON

  • Most commonly used seat material for food application. Has extensive chemical and temperature resistance.
  • Not suitable for great temperature fluctuations: Teflon tends to coldflow and does not return to its original shape.
  • Can be used as a coating on other elastomers.
  • Useful temperature range: 0°F to 250°F

BUNA N

  • Nitrile compound provides an elastic seat that makes for leak-free, easy handling of valve. Least expensive elastomer.
  • Good chemical resistance: excellent for use with petroleum solvents, gasoline, alcohol, etc.
  • Recommended lubricant: silicone
  • Useful temperature range: 0°F to 180°F

EPDM

  • Good for higher temperatures (low pressure steam to 30 psi)
  • Good resistance to mild acids, dilute alkalis, silicone oils and greases, ketones and alcohol.
  • Avoid use for petroleum oils or di-ester based lubricants
  • Useful temperature range: 40°F to 250°F

VITON®

  • Both extreme temperature and good chemical resistance.
  • Useful at high temperature when buna or EPDM is not suitable.
  • Recommended lubricant: silicone
  • Useful temperature range: 0°F to 350°F

Viton is a registered trademark of DuPont Dow Elastomers.

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