Jet Pump：Principles, Applications, and Advantages

1. Working Principle

A jet pump operates on the Venturi effect. High-pressure working fluid is forced through a nozzle, creating a high-velocity jet. This jet creates a vacuum in the mixing chamber, which draws in the suction fluid. The two fluids mix, and the mixture passes through a diffuser where velocity decreases and pressure increases, allowing discharge at higher pressure.

2. Advantages

• Simple structure, no moving parts — High reliability, low maintenance, and long service life.

• Handles challenging fluids — Can pump slurries, abrasive materials, corrosive chemicals, and high-viscosity fluids without damage.

• Self-priming — Can operate even when suction line contains air, with no risk of damage.

• Compact and lightweight — Easy to install in confined or hazardous locations.

3. Disadvantages

• Low efficiency — Generally 30-40% at best, lower than mechanical pumps.

• Requires external high-pressure power source — Needs a separate supply of high-pressure fluid (e.g., a booster pump or steam), adding operational cost.

4. Key Features

• Venturi-based suction — no impeller or mechanical seals.

• Can be driven by liquid, gas, or steam.

• Available in various configurations (single-stage, multi-stage, shallow/deep well).

• Compatible with fluids containing solid particles.

5. Applications

6. Summary

The jet pump is a simple, reliable, and versatile device that uses the Venturi effect to move fluids without moving parts. Its main strengths are low maintenance and the ability to handle difficult fluids, while its main drawbacks are low efficiency and dependence on an external power source. It remains a valuable solution in industries ranging from water supply to oil extraction.