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Gear Pump Newly designed

  • All  users,  who  are operating  Gear  Pumps

    Many gear pumps are applied for the transferring petro-chemical resin (So called Polymer).

    PS, AS, PE are non-Newtonian liquid, whose  viscosity go down  steep according to high  shear rate. Volumetric efficiency of most gear pumps becomes very low at high  discharge pressure of more than 120  bar. As the results, low discharge capability and  low pumping efficiency of gear pumps cause low volumetric efficiency of gear pump, and  the gear pump causes a bottle-neck of polymer plant’s capacity.

    We have developed that our new  gear pump’s technology is to create the high  efficiency by only replacing bearings in considered with the characteristics of Non-Newtonian liquid. And These gear pumps of M-company (Switzerland) and  S-company (Japan) have performed every good efficiency as shown in the attached graph.

    We  strongly recommend you  considering adopting this improve by  replacement to the newly designed bearings. At  the same time, you  can  expect the energy saving and  reducing polymer temperature.

    Refer to the below mentioned actual modification records and  improved effects.

    1.   Modification records

    1-1 Extraction pumps of M company (Switzerland)

    Volumetric efficiency at 150 bar discharge pressure was  improved from 75~80%  to around 95%

    by the newly  designed bearings.

    1-2 Extraction pump of S company (Japanese)

    S company’s pump of the newly  designed bearings have performed the volumetric efficiency of

    94~97%  at 150~170 Bar discharge pressure.

    1-3 Pumps in extrusion line

    Gear pumps in extrusion line  have performed around 95% volumetric efficiency.


    2.   Improvement efficiency

    2-1 Saving energy

    Extraction pump of 5~7Liter/rev. can  earn the cost of replacement bearings in 3~5  years by only  saving energy at operation condition of 4~5  m3/hour flow rate and  140~150 Bar discharge pressure.

    2-2 Reducing polymer temperature-up

    Reducing leakage flow amount, which are affected friction energy and  heat conduction, contributes the reducing thermal history and  temperature-up.

    2-3 decreasing history of shear stress

    Decreasing leakage amount means sharp decreasing amount of shear stressed polymer.

    2-4  Increasing production amount

    In  case  that flow  rate of  gear pump is  the bottle-neck of  production, the production increases, as volumetric efficiency improves.