LOBE PUMPS:

Lobe pumps as manufactured by stothert and pitt have inner and outer element which rotate in a renewable liner fitted in the pump body.

The inner rotor is eccentric to the outer and is fitted to a shaft-located by bearings in the pump covers. The pump types are defined by the number of lobes and recesses, for example three - four and seven - eight. As the rotor turns pockets of increasing and then decreasing capacity are created to give a pumping action.

The normal maximum pressure is 21 bar with capacities of upto 400 tonnes/hour. Special designs for up to 83 bar have been made for hydraulic control application.

The three - four types are particularly suited for handling high viscosity fluids and are set to run at comparatively slow speeds which may require a gear drive from the motor. The seven - eight types operate at higher speeds, being nost efficient at around 720 rpm when handling fluids in the lower viscosity range.

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