PTFE

PTFE (polytetrafluoroethylene) offers almost universal chemical resistance – to concentrated acids and alkalis as well as solvents, fuels and oxidisers. In air-operated diaphragm pumps PTFE is used as a one-piece FUSION diaphragm or as a 2-piece diaphragm with an elastomer back-up, because PTFE itself has little elasticity. Pumps with this check valve are rated for fluid temperatures up to 175 °C (see the data sheet of each version).

Typical fluids

Aggressive chemicals, solvents, paints, high-purity fluids and any application where chemical compatibility is uncertain.

Typical applications

Acids: mineral and organic acids
Solvents: aromatic and aliphatic solvents, ketones, aldehydes, esters, chlorinated hydrocarbons, de-icers
Coatings: emulsions, latex, pigments, resins, solvents, thinners
Electroplating: aggressive acids and salts, residual sludges, waste water, neutralisation, caustic soda, ferric chloride
Pharma: liquids, creams and additives

Limits

With highly abrasive slurries PTFE wears faster than Santoprene or Neoprene – worth comparing.

Matching pumps in our range

Versamatic air-operated double diaphragm pumps with this feature are available in these versions:

Port sizes: 1 1/2" (DN 40), 1" (DN 25), 1/2" (DN 15), 1/4" (DN 8), 2" (DN 50), 3" (DN 80), 3/4" (DN 20)
Flow ranges: 0–20 l/min, 20–50 l/min, 50–100 l/min, 100–200 l/min, 200–400 l/min, 400–700 l/min, 700–1100 l/min
Housing materials: Aluminium, Stainless steel, Cast iron, Conductive polypropylene, PVDF, Polypropylene
Diaphragms: EPDM, FKM (Viton), Hytrel (TPC), NBR (Buna-N), Neoprene (CR), PTFE, Santoprene (TPE)

All matching pumps are listed below – use the filters to narrow down flow rate, port size and materials.

Note: material information is for guidance only. Medium, concentration and temperature are decisive – if in doubt we check compatibility for your fluid.

Not sure which pump fits? Send us your medium, flow rate, pressure, temperature, density and viscosity – we will check the selection and reply with an offer.

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