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The Haskel?4B-25 is a compact, pneumatic liquid pump with a 0.75?HP air-drive motor. Featuring a 25:1 pressure ratio and capable of reaching up to 2,700?PSI (186?bar), its designed for safe, non-electrical operation in environments where ignition risk must be minimized. Its stall-to-hold capability maintains pressure without consuming air, and infinitely variable pump speed provides precise control over fluid dosing or hydrostatic testing. Manufactured with stainless steel wetted parts and durable seals, its ideal for liquid transfer, pressure testing, and fluid control in demanding industrial settings.
- Powered by compressed air no electricity or sparks
- Delivers pressure up to 2,700 PSI (186 bar)
- Stall-lock function holds pressure without air usage
- Adjustable pump speed for precise fluid delivery
- Stainless-wetted components resist corrosion
| Model / Part No. | 4B-25 |
| Drive Power | 0.75 HP pneumatic motor |
| Nominal Ratio | 25:1 (actual ~29:1) |
| Max Output Pressure | 2,700 PSI (186 bar) |
| Displacement/Cycle | ~0.5 in (8.2 mL) |
| Drive Air Pressure | 30 100 PSI clean air/gas |
| Wetted Materials | Stainless steel, UHMWPE/Buna seals |