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This kind of pump can be found in all areas of industry where vacuum is required, from atmospheric pressure up to 1×10-3 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.
RVB pumps are generally found combined with initial stage pumps and condensers arranged in series, although the latter is less frequent. The drive shaft of Roots pumps is activated directly by the motor axle through a flexible mounting. The entry of the drive axle is sealed by locking segments with an oil chamber, and also includes a cooling chamber to eliminate heat produced by the closure.
The seals and other elastomers are made from fluoroelastomer VITON. The RVB type is equipped with standardized flange-mounted motors operating on alternating triphasic current in compliance with IEC regulations.
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.