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The Haskel 4B-37 is a compact and robust 0.75?HP pneumatic-driven liquid pump, delivering precise, high-pressure fluid control without electricity. With a nominal ratio of 37:1 (actual ~42:1), it can generate pressures up to 3,800?psi (262?bar). It features a stall-to-hold function to maintain pressure on standby and an air-powered design that eliminates heat and spark risk. Built with stainless steel wetted parts and durable seals, its ideal for hydrostatic testing, fluid transfer, and industrial dosing in demanding environments.
- Runs on compressed air no heat or fire risk
- Delivers up to 3,800 PSI continuous pressure
- Stall-to-hold feature locks pressure without air use
- Variable cycle rate for precise flow control
- Stainless-wetted components ensure corrosion resistance
| Model / Part No. | 4B-37 |
| Type | Air-driven liquid pump |
| Power | 0.75 HP (0.56 kW) |
| Nominal Ratio | 37:1 (Actual 42:1) |
| Max Output Pressure | 3,800 psi (262 bar) continuous |
| Displacement / Cycle | 0.35 in (5.7 mL) |
| Max Flow Rate | ~166 in /min (2.7 L/min) |
| Air Drive Pressure | Up to 100 psi |
| Cycle Rate | Up to 225 cycles/min |
| Operating Temperature | 25 F to 150 F (3.9 C to 65 C) |
| Pump Ports | Standard NPT ports (as per Haskel spec) |
| Wetted Materials | Various alloys and seal configurations available |