Fristam continues to expand its range of hygienic centrifugal and positive displacement pumps by adding pumping units with double-screw technology. From April 2016, the new series is available for delivery in several sizes. On the basis of experience from innumerable projects and feedback from customers, the Fristam engineers placed special emphasis on simple, robust, low-maintenance design in developing the FDS pump models. Engineering teams will now have a new hygienic displacement pump at their disposal, which will combine the technological advantages of double-screw principles with the decades of manufacturing experience and high quality standards brought to the table by Fristam Pumps.
The outstanding features of Fristam FDS pumps manifest themselves in engineering details. The pump casing comes in three parts, consisting of an intermediate flange, the screw casing and the pump cover. This enables individual adaptation of the connections to any conceivable production system requirement. Thanks to central positioning of the gearwheels inside the bearing support area, the entire pump comes in a very compact design. Moreover, its massive shaft has reinforcements in the area of critical diameters to ensure maximum rigidity. Further stability is achieved through a combination of particular large bearings and an increased bearing distance. The result is smooth running with minimal wear. The pump’s service life is also prolonged by an improved lubrication system for the bearings. They are always immersed in an optimized quantity of oil flowing along a specifically designed circulation path. Maintenance work on the gears is facilitated by direct access to the drive system without removal of the pump. Replacing the mechanical seals of the FDS takes no more than a few simple steps: first remove the pump casing and cover, then pull out the screws and remove the item keys which lock the seals in place, finally pull out the mechanical seals towards the front and replace them. Up to nine different screws are available for each pump size to cover the entire bandwidth of possible applications.
As a positive displacement pump, the Fristam FDS is ideal for the most viscous products. At the same time, however, this series is capable of reaching very high speeds. Consequently, it is also able to transport significant amounts of any low-viscosity medium such as water or liquid detergents. This dispenses with the need for an additional pump for cleaning processes. The axial displacement principle results in extremely low pulsation even at the highest pressure ranges. The pump is easy to clean, since the mechanical seals of the FDS are positioned in fully flushed areas with constant pressure conditions. Thanks to the absence of cavities, residue-free rinsing of the pump in a CIP process presents no problem.
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