About Rotary and Positive Displacement Pumps
The method of operation for a Rotary / Positive Displacement pumps is also straightforward. An increasing volume is opened to suction‚ filled‚ closed‚ moved to discharge and displaced. The delivered capacity is nearly constant throughout the discharge pressure range. This constant capacity or flow will intersect a system curve at a defined point‚ allowing a high degree of system control.
Colfax offers different types of positive displacement pumps within our product portfolio including:
- 2 Screw
- 3 Screw (with seal and magnetic coupling)
- Progressive Cavity
- Metering
- Peristaltic or Hose
The table below is meant to serve as a guide; please contact your local Colfax representative to determine the best fluid handling product for your application.
| Pump Type: | Two-Screw | Three-Screw | Progressing Cavity | Metering | Peristaltic |
|---|---|---|---|---|---|
| Max Flow Rate: | 23‚500 gpm or 5‚300 m3/h | 3‚300 gpm or 750 m3/h | 1‚980 gpm or 450 m3/h | 9 gpm or 2 m3/h | 264 gpm or 1‚003 l/min |
| Max Discharge Pressure: | 1‚450 psi or 100 bar | 1‚740 psi or 120 bar | 580 psi or 40 bar | 2‚500 psi or 170 bar | 226 psi or 16 bar |
| Max Viscosity Range: | 1‚000‚000 cst | 5‚400 cst | 270‚000 cst | 50‚000 cst | 100‚000 mm^2/s |
| Max Solids Content: | 2% | 0.5% | 20% | 0.5% | |
| Common Liquids Pumped: |
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