The Bowie Pump is a rotary gear pump. The delivery rate will vary some with the differential pressure and the viscosity of the liquid.  Bowie Pumps operate either clockwise or counterclockwise with equal efficiency.

300 Series Pumps

Bushing Type Pump. 

400 Series Pumps

Outboard Ball Bearings.  Bearings isolated from pumped product by way of separated glands.

500 Series Pumps

Ball Bearings Type Pump.

8100/9100 Series

8100 Series is a aluminum bronze bushing pump.  9100 Series is a ductile iron bushing pump

7500/9500 Series

Bearing Type Pump