Casappa WHISPER WSP20 hydraulic pumps
WSP20 belongs to Casappa WHISPER series, patented low‑noise external aluminium‑body gear pumps (WSP = pump; WSM = motor)。
Core Features
- Patented low‑noise design: Hydraulic pulsation reduced by 75%, much quieter than standard gear pumps
- 3‑piece high‑strength extruded aluminium housing
- Outboard mounted bearings: Good for heavy‑duty cyclic loads
- High volumetric & mechanical efficiency
- Wide options: shafts, flanges, port conforming to SAE / DIN / European standards
- Available as single pump, multi‑section tandem pump; can integrate built‑in valves
Optional valves: anti‑cavitation valve, relief valve, priority valve, load‑sensing priority valve, electric bypass valve
General Technical Data (WSP20 frame size)
| Item | Specification |
|---|---|
| Pump type | Fixed‑displacement external gear pump |
| Frame size | WHISPER 20 (WSP20‑xx) |
| Displacement range | 4 … 31.5 cm³/rev |
| Max peak pressure | 300 bar (4350 psi) |
| Max speed | 4000 rpm; min speed ~650 rpm |
| Housing | High‑strength aluminium alloy |
Common WSP20 model displacements
WSP20‑4,‑6.3,‑7.2,‑8,‑9,‑10.5,‑11.2,‑14,‑16,‑19,‑20,‑24.5,‑25,‑27.8,‑31.5 cm³/rev
Continuous working pressure drops as displacement increases (smaller displacements allow higher continuous pressure).
Typical Applications
- Construction & agricultural machinery
- Material‑handling equipment
- Mobile working machines where low noise is required
- Fan drive systems, compact power units
Model code example
WSP20‑14‑S0‑P3‑E‑R
- WSP = WHISPER pump
- 20 = frame size
- 14 = displacement 14 cm³/rev
- S0 = flange form
- P3 = port configuration
- E = seal material
- R = rotation (clockwise / counter‑clockwise)
