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Keyword:
P
Pressure Pump
is used for circulation of the thermofluid in an extemal closed circuit and in the bath.
Pressure/Suction Pump
This pump has a pressure and a suction stage which are driven by the same motor. The thermofluid is delivered from the pressure stage from the thermostat into the circuit, and the suction stage draws the liquid back into the thermostat. A pressure/suction pump can be used in just the same way as a pressure pump for a closed circuit. lt has the advantage compared to a pressure pump that the pressure in the extemal circuit falls from positive values(pressure) in the flow line and to negative values (suction) in the return line and is almost zero in the application itself. Thus it is suitable for the hermoregulation of pressuresensitive glass vessels. Additionally it is possible to thermoregulate an open extemal circuit (e.g. a bath) with the aid of a pressure/suction pump. This cannot be done with a pure pressure pump, since this delivers thermofluid to the bath. The thermofluid can only be returned to the bath via a suction stage. In any case a so-called constant Ievel device is required to maintain a constant level in the bath and this ensures that the flows of both pump stages are controlled so that they are equal. This is the only way that the Ievel in the extemal bath can be maintained constant.
