Pumping Corrosive or Toxic Liquids

Industrial Pumps with PTFE or UHMW Fluid Paths


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White Knight PSD Series air-operated double-diaphragm (AODD) pumps feature PTFE or UHMW (PE), corrosion-resistant fluid paths, which make the pumps ideal for corrosive or toxic liquids such as fuels, glues, paints, resins, inks, or wastewater, as well as more viscous fluids and slurry.

The pumps are available in 1/4, 3/8, 1/2, 1, or 1-1/2 in models. They feature high-quality machined designs, unique sealing surfaces, and tight bolt configurations to ensure consistent, reliable performance and superior product containment. They have no exposed metals and may be configured in various materials to meet most abrasion, temperature, and chemical compatibility requirements. They are dead-head capable and achieve high flow rates while minimizing air consumption and operational noise. The pumps have non-lubricated, self-priming, icing-resistant air systems.

PSD Series pumps are easy to install, operate, and service. They can be serviced in the field to minimize repair costs, downtime and production loss. They require only minimal parts to rebuild and can be rebuilt in situations that would require other AODD pumps be replaced, which increases pump life and decreases total costs of ownership.

PSD Series Pumps

Features & Benefits

  • PTFE or UHMWPE liquid paths
  • Leak-proof machined design
  • Plastic exteriors prevent corrosion and ensure clean, safe operation
  • Removeable air motor
  • Controlled in-house engineering and manufacturing
  • Positive seat-check assembly improves suction lift and pump performance
  • Non-lubricated, self-priming, icing-resistant air systems
  • UHMWPE is 1/2 the weight of steel
  • Various diaphragm and check materials
  • Polypropylene (PP) pump body
  • Dead-head capable operation
  • Dry-run, dry-prime capability
  • Small footprint; easy to install and service
  • Durable, field rebuildable design with minimal parts
  • Multiple liquid inlet/outlet directional setups
  • Minimizes factory environment noise and operator fatigue
Specification Sheet
High Purity PTFE and PFA Pump Materials
Chemical Delivery 7 Bar (100 psi) Pressures
Fluid Temperatures to 100 Degrees Celsius (212 Degrees Fahrenheit)
White Knight Pneumatic Parallel Pilot Valve Shift Method
White Knight One-Year Limited Warranty
CE Certification Mark


Parallel pilot valves prevent stalling.

White Knight Pneumatic Diaphragm Pump Operation
White Knight Air-Operated Diaphragm Pump Operation

Supply Air

Exhaust Air

Liquid Suction

Liquid Discharge