Lafferty Learning Center

Check Valve Chemical Compatibility

Chemical suction and compressed air check valves need to be replaced occasionally, but consider an alternate seal or body material if you frequently need to replace the standard check valve on your unit.

Check valve substitutions for new equipment are available at the time of purchase.

Most check valves are available with Viton, EPDM or Kalrez seals and stainless steel or polypropylene bodies.

These are examples of common check valve substitution part numbers.

Consult the parts diagram in the instructions for each unit to confirm the standard check valve materials. Some units include different check valves for foam and sanitize functions.

Common Allowed Fluids

List provided for general reference only.
Consult your chemical supplier to confirm suitability.

EPDM (Santoprene)
  • Potable Water
  • Caustic Alkaline
  • Mild Acids
  • Alcohol
  • Ketones
  • Peracetic Acid (PAA)
Viton (FKM)
  • Strong Acids
  • Solvents
  • D-Limonene
  • Oils
  • Chlorine
  • PAA with less than 15% hydrogen peroxide
Kalrez (FFKM)
  • Ketones
  • Alkaline
  • Alcohol
  • Diluted Acids
  • Chlorine (Best)
  • PAA with more than 15% hydrogen peroxide

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