OBERDORFER . 820B-07

This close coupled centrifugal pump uses a mechanical type shaft seal with a Nitrile rubber element. It is suitable for water, oils, and some mild solvents. It is limited to 212o F. fluoroelastomer seals and polytetrafluoroethylene (PTFE) seals are available for severe solvents, difficult chemicals, and elevated temperatures. The impeller is attached directly to the motor shaft. This pump can handle small impurities in the liquid. The flow of a centrifugal pump can be conveniently controlled by a throttling valve in the discharge line without the need for a relief valve. In centrifugal pumps, the horsepower demand will decrease as the pressure increases. Maximum horsepower occurs with a wide open discharge. FEATURES Bronze Construction Stainless Steel Shaft Carbon Face Mechanical Pump Seals Nitrile STD Fluoroelastomer (S10) or Polytetrafluoroethylene (PTFE)(S11) Pump Seals Available for Solvent Transfer Field convertible to pedestal drive model Will Handle Contaminated Liquids Extremely Quiet Pump-heads only easily field mounted to standard footless C flange motors Keyless impeller option (820B-07) O-Ring housing seal eliminates gasket problems DRIVE This close-coupled pump uses a standard NEMA 56C motor(not included) with no base. Single phase motors are non-reversible and are wired for the proper pump rotation which is counter-clockwise looking at inlet end of pump. See the dimensional drawing. Three phase motors must be checked out for proper rotation when pump is installed. Interchanging of any 2 wires in a 3-phase system will reverse motor rotation. LIQUIDS TEMPERATURES The special pump alloys used provide corrosion resistance to many liquids including water, water solutions, and a wide range of commercial chemicals. Questions as to the chemical compatibility of special liquids should be referred to the factory. Viscous liquids with a maximum viscosity of 2000 Saybolt Seconds Universal can be pumped. However, when pumping viscous liquids as compared with