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The Haskel MS‑220 is a compact yet powerful stainless steel pneumatic-driven liquid pump delivering pressures up to 20,000 psig continuously (25,000 psig intermittently). Built on a 220:1 ratio (actual ~237:1), it outputs approximately 0.021 in³ (0.34 mL) per cycle via a 0.33 HP motor and 0.875″ stroke. Its spring-return design features a stall-at-pressure function, enabling stable pressure maintenance without continuous air supply. Ideal for precision tasks such as hydrostatic testing, fluid transfer, and clamping in clean or hazardous environments, this pump uses corrosion-resistant materials and requires no air-line lubrication.
- High-pressure capability: up to 20,000 psig continuous, 25,000 psig intermittent
- Stainless steel hydraulic piston and body, corrosion-resistant
- Stall-at-pressure hold — stable pressure without air use
- Spark-free pneumatic drive, no heat or flame
- Compact and low-maintenance, suitable for critical applications
| Model | MS-220 |
| Power | 0.33 HP (0.25 kW) |
| Nominal Ratio | 220:1 (Actual ≈ 237:1) |
| Displacement per Cycle | 0.021 in³ (0.344 mL) |
| Max Continuous Pressure | 20,000 psig (1,380 bar) |
| Max Intermittent Pressure | 25,000 psig (1,723 bar) |
| Stroke Length | 0.875 in |
| Air Drive Pressure | Up to 125 psig |
| Weight | ~6 lb (2.7 kg) |
| Ports — Inlet | 3/8" NPT |
| Ports — Outlet | 1/4" NPT |