Page 199 - Know and Understand Centrifugal Pumps
P. 199

Know and Understand Centrifugal Pumps



























        Fiaure 13-1






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        Fiqure 13-2


        History

          The mechanical seal was developed at the beginning of the last century.
          Its development coincided with the invention of the steam turbine, the
          dynamo and the electric motor.
          In  1919,  there  was  a  patent  on  a  mechanical  seal  showing  spring



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