Three Spindle Screw Pumps

Three Spindle Screw Pumps are a development of the ancient Archimedes Screw principle. The design is of rotary positive displacement and common to all of these pumps creates a partial vacuum by the opening and closing or sweeping of a series of voids or volumes. Three Spindle Screw Pumps do this by having a central drive screw which meshes with two separate idler screws. The design can be compared with a helical gear pump in some ways where the teeth have been drawn axially to make true helical screw. As the meshing screws are relatively long they are extremely efficient and do not suffer the same ‘slip’ problems of gear pumps (see gear pumps)

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