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This kind of pump can be found in all areas of industry where vacuum is required, from atmospheric pressure up to1x10-3 mbar (appropriately matched). Some examples are the food, electrical, mechanical, chemical industries and many others.
The main feature of these pumps is their use for the pumping of material which contaminates wastewater and their treatment of attendant liquids from the pump which makes them highly ecological. The same applies to vapour pumps where the purest recuperation is required. They are ideal for extremely short pumping cycles in large chambers.
The recirculating RVR vacuum pump has been especially designed for applications where it is necessary to interrupt the vacuum constantly, for example in the vacuum packing of food. To protect the pump in these working conditions, we have incorporated a recirculation bypass controlled by an overpressure valve.
This pump is ideal for applications where it is not possible to use a frequency converter, due to the constant changes in working conditions which would mean the deterioration of the electric motor. Given that the pump is equipped with the bypass, it is possible to start the Roots pump and the initial stage pumping simultaneously since the machine can work temporarily without a high initial stage vacuum. It is advisable not to work within a range of pressures which may provoke the permanent opening of the bypass since the gas would continually heat up and reach the heat limit of the machine.
Root type pumps belong to the positive displacement group. Two symmetrical figure of eight pistons rotate in opposite directions without touching each other or the housing, appropriately geared and housed within the pump unit. Activation of the pistons is through a gearbox which synchronizes the rotation and guarantees absence of contact between them. Roots type pumps are better used in combination with an initial stage pump (liquid ring pumps, rotary vane pumps, etc.)
With an adequate coupling between the initial stage pump and different units, very good pumping capacity at very high vacuum can be reached. They are especially appropriate where high speeds and low pressure are required.