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Screw pumps are classified into single screw pumps, twin screw pumps, and three screw pumps.
single screw pumps
The single-head male spiral rotor rotates in a special double-headed female spiral stat or and can swing back and forth along the pump center line to keep in mesh with the stator.
twin screw pumps
There are two screw shafts of the same size, one for the drive shaft and one for the driven shaft,which is rotated synchronously by the gears.
three screw pumps
There is an active screw and two driven screws that mesh with it.
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