Steam jet pumps

The design of a jet pump is extremely simple; it consists of 3 main components: drive nozzle, suction or mixing chamber and diffuser. The pressurised motive agent (liquid or gas) is expanded on leaving the nozzle.

The pressure energy is converted into velocity energy. This flow transfers its energy into the environment. This flow transfers its energy to the environment and entrains liquid, gas or solids out of the head. In the mixing chamber, the velocities of the two media match each other. The motive flow and suction flow are intensively intermixed. The energy exchange occurs in accordance with theorem of momentum. In the down-stream diffuser, the velocity is converted to pressure.

The shape and dimensions of jet pump have to be carefully adapted to all the operating conditions to guarantee correct, reliable function. The size and appearance vary depending upon the intended application.

Single-stage jet pumps are only able to cope with a restricted compression ratio. For lower suction pressures, therefore, it is necessary to connect several jet pumps in series.


These ejectors are used to transport and condense gases, vapours, liquids. Depending upon the application, the following types of jet pumps are used:

Steam jet vacuum pumps
are used extensively by industry for the generation of vacuumsi

Steam jet liquid pumps
lift and transport fluids

Steam jet blowers
may achieve a pressure difference of up to 500 mm Ws


Most important advantages for the customer

- simple design 
- no moving parts
- simple operation
- virtually maintenance-free operation
- high operational reliability
- wide choice of materials, selected according to the media to be handled 

SVS GmbH & Co. KG
Im Müldersfeld 30
47669 Wachtendonk

Phone: +49 (0)28 36 - 9 71 96 - 0     e-mail: info (at)