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Rotary Pumps

Our ranges of rotary positive displacement pumps include:

  • Gear pumps
  • Lobe pumps
  • Vane pumps
  • Peripheral pumps
  • Screw pumps
  • Hollow rotary disc pumps

In gear pumps the liquid is trapped by the opening between the gear teeth of two gears and the casing of the pump on the suction side.  On the pressure side the fluid is squeezed out when the teeth of the two gears are rotated against each other.  The motor provides the drive for one gear.

The lobe pumps operates similar to the gear pump, but with two lobes driven by external timing gears.  The lobes do not make contact.

Some designs of positive displacement pumps combine the design elements of reciprocating pumps with the design elements of rotary positive displacement pumps.  The resulting rotating reciprocating pump has no mechanical valves, like a rotary positive displacement pump, but has accurate output and typical service intervals more commonly associated with a reciprocating positive displacement pump.

PumpsFlow RangeMaximum Pressure 
HNPM Internal Gear Pumps 1152 ml/min 150 bar More Info
Micropump External Gear Pumps 40 l/min 8.7 bar  More Info
Liquiflo External Gear Pumps 200 l/min  24 bar  More Info
Viking Gear Pumps  345 m3/hr  172 bar  More Info
Viking Lobe Pumps 184 m3/hr 27 bar More Info
Viking Rotary Vane Pumps 36 m3/hr 14 bar More Info


Rotary pumps from the UK's leading pump specialist, Michael Smith Engineers.