Laboratory steam jet vacuum pumps consist of two steam jet stages connected in series and backed by a liquid jet vacuum pump. Unlike the multi-stage steam jet vacuum pumps they do not use any drain pumps or barometric legs.
The specific steam and cooling water requirements are higher in comparison to multi-stage steam jet vacuum pumps which are designed to operate continuously for longer operation periods.
The water consumption of the laboratory steam jet vacuum pumps is relatively high as the jet vacuum pump does not only serve to condense but also to compress the air and gases to atmospheric pressure. The fresh water requirement can be reduced by utilizing water re-circulation.
When cooling water consumption is an important factor, the laboratory steam jet vacuum pumps are supplied with a complete water recirculation system. This consists of the following: water tank, pump incl. motor, water temperature controller, automatic cooling water supply valve, thermometer and interconnecting piping between pump and jet condenser. All re-circulation system parts are protected against corrosion.
The automatic cooling water supply valve ensures that the water temperature is kept within permissible limits.
If required, laboratory steam jet vacuum pumps can even be delivered without water circulation system.