Rotary Gear Pumps by Oberdrfer Pumps Bronze Stainless Cast Iron Plastic Bronze Flow: 1-175 GPM (3 - 662 LPM) Pressure: 0-150 PSI (0 - 10.3 BAR) Performance: Positive displacement. Little flow decrease with pump pressure increase. Flow increases with speed increase. Suction Lift (water): 0-20 Ft. below pump level (0-6.1 meters) Liquid Cleanliness and Viscosity: Close tolerances require clean liquids. Viscous liquids require lower pump speeds. Liquid Compatibility: Most common liquids and compatible chemicals. Noise: Metal to metal gear noise very evident. metal to plastic gear noise evident. Power Required: Power demand increases with speed and pressure. Discharge Line: Positive displacement relief valve necessary to shut off. Bearing Lubrication Required: Carbon bearings - No Bronze bearings - No Temperature: Carbon bearings: - 40 to 300 degrees F (-40 degrees C to 150 degrees C) Bronze bearings: -40 to 400 degrees F (-40 degrees C to 208 degrees C) Seal Arrangement: Packing, Lip, Mechanical Types: Close Coupled & Pedestal   Stainless Steel/Alloy C Flow: 0-23 GPM (0 - 87 LPM) Pressure: 0-100 PSI (0 - 6.9 BAR) Performance: Positive displacement. Little flow decrease with pump pressure increase. Flow increases with speed increase. Suction Lift (water): 0-20 ft. below pump level (0 - 6.1 meters) Liquid Cleanliness and Viscosity: Close tolerances require clean liquids. Viscous liquids require lower pump speeds. Liquid Compatibility: Chemicals and compatible liquids. Noise: Metal to metal gear noise very evident. Metal to plastic gear noise quieter. Plastic to plastic gear noise most quiet. Power Required: Power demand increases with speed and pressure. Discharge Line: Positive displacement relief valve necessary to shut off. Bearing Lubrication Required: No Temperature: -40 degress F. to 400 degrees F. (-40 degrees C to 208 degrees C) Seal Arrangement: Mechanical or packing Types: Close coupled & Pedestal   Cast Iron Flow: 0-35 GPM (0-132.5 LPM) Pressure: 0-500 PSI (0 - 34.5 BAR) Performance: Positive displacement. Little flow decrease with pump pressure increase. Flow increases with speed increase. Suction Lift (water): 0-20 ft. below pump level (0 - 6.1 meters) Liquid Cleanliness and Viscosity: Close tolerances require clean liquids. Viscous liquids require lower pump speeds. Liquid Compatibility: Petroleum products, solvents and oils, non-corrosive liquids, liquid propane. Noise: Helical gear design quiet. Power Required: Power demand increases with speed and pressure. Discharge Line: Positive displacement relief valve necessary to shut off. Bearing Lubrication Required: Carbon bearings - No Temperature: -40 degrees F. to 250 degrees F. (-40 degrees C to 122 degrees C) Seal Arrangement: Mechanical or packing Type: Close coupled & Pedestal PPS Plastic (Polyphenelene Sulphide) Flow: 0-8 GPM (0-30.3 LPM) Pressure: 0-100 PSI (0 - 6.9 BAR) Performance: Positive displacement. Little flow decrease with pump pressure increase. Flow increases with speed increase. Suction Lift (water): 0-20 ft. below pump level (0 - 6.1 meters) Liquid Cleanliness and Viscosity: Close tolerances require clean liquids. Viscous liquids require pump speeds. Liquid Compatibility: Most corrosive liquids and chemicals. Noise: Plastic gear noise most quiet. Power Required: Power demand increases with speed and pressure. Discharge Line: Positive displacement relief valve necessary to shut off. Bearing Lubrication Required: Carbon bearings - No Temperature: -20 degrees F. to 180 degrees F. (-29 degrees C - 82 degrees C) Seal Arrangement: Mechanical, lip, or packing Types: Close coupled & Pedestal