PSR Series White Knight Pumps

PTFE/PFA Pumps for Recirculation Applications up to 100°C (212°F)


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PSR Series pumps are the ideal solution for ambient temperature, ultra-pure recirculation applications. These PTFE/PFA pumps are completely metal free and operate with the unique White Knight shuttle valve, which eliminates the need for complicated detents and manual resets. They perform safely and reliably running continuously throughout their one-year warranty. They offer air supply pressures up to 4 Bar (60 psi) and operate in thermal cycling applications with fluid temperatures up to 100°C (212°F).

The pumps are available in PSR025 and PSR050, which are capable of maximum flow rates of 25 and 50 lpm, respectively.

Features & Benefits

  • 100% Metal-Free
  • Process-safe PTFE/PFA flow paths
  • Leak-proof, machined design
  • No elastomer O-rings, no leaks, never retorque
  • No lubrication in shift mechanisms
  • No electric motors, which generate heat
  • Pneumatic Logic™ minimizes liquid pulsation and pump vibration
  • Various liquid connection styles or sizes
  • Safe, leak-free operation due to no-metal design
  • Polypropylene heads and ceramic in air shuttle valve
  • Minimal parts for durable design
  • Class 100 cleanroom assembly, testing, and packaging
  • Easy to install and service
  • Proven reliable to 200 million+ cycles
  • No preventative maintenance during one-year warranty
Pump Temperatures to 100 Degrees Celsius (212 Degrees Fahrenheit)
Chemical Recirculation 4 Bar (60 psi) Pressures
White Knight Ultra-Pure Teflon PTFE/PFA Pump Materials
White Knight Pneumatic Shuttle Valve Shift Method
White Knight One-Year Warranty
CE Certification Mark


PSR Series pumps feature White Knight’s Pneumatic Logic™, a detent-free shuttle valve design that improves performance and reliability by minimizing vibration, pulsation and wear.

Pneumatic Shuttle-Driven Pump Operations Diagram

Need fiber optics or proximity sensors?

PFA Series pumps are controlled with fiber optics.
PXA Series pumps are controlled with proximity sensors.

Supply Air

Exhaust Air

Ambient Air

Liquid Suction

Liquid Discharge

Temperature Limits

PSR Series Air-Supply Fluid Temperature Limitations

Need Higher Temperatures?

PSH and PSU Series pumps are capable of temperatures up to 145°C (293°F) and 210°C (410°F), respectively.

Performance Curves

PSR025 Performance Curves

PSR025 Performance Curves

PSR050 Performance Curves

PSR050 Performance Curves


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PSR025 Dimensions

Dimensions: [mm] in

PSR025 Pump Dimensions
Download PSR025 Dimensions (PDF)

PSR050 Dimensions

Dimensions: [mm] in

PSR050 Pump Dimensions
Download PSR050 Dimensions (PDF)


Flow Rate*
21.9 LPM
5.79 GPM
57.5 LPM
15.19 GPM
Size of Air Connection
1/4" FNPT
1/4" FNPT
Displacement Per Cycle*
0.076 liters
0.020 gal.
0.189 liters
0.050 gal.
Cycles Per Minute*
300 max
258 max
2.5 kg
5.51 lbs.
5.0 kg
11.02 lbs.
Suction Lift*
1 m (3 ft)
1 m (3 ft)
Sound Pressure**
69.38 dB(a)
76.55 dB(a)
72.38 dB(a)
79.12 dB(a)
Sound Power**
58.52 dB(a)
65.75 dB(a)
64.31 dB(a)
71.98 dB(a)
Max Temperature
100°C (212°F)
Max Pressure
4 Bar (60 PSI)
Fluid Path Materials
Non-Fluid Path Materials
PTFE / PFA / PP / Ceramic
Stroke Detection Options
Fiber optic with or without sensor, or solid state pressure switch
Leak Detection Options
Fiber optic with or without sensor, or conductivity
Electronic Control

*May vary depending on configuration. Suction lift diminishes over time. Recommended installation level less than 3 ft. above source.
**dB Level at 60PSI 50CPM (top) and 60PSI maximum CPM (bottom). Sound Levels measured in accordance with ISO9614-2:1997.