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How chemical pumps work

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How chemical pumps work

  1. 1. How chemical pumps workDiscovering what a gear pump isThey are in short, positive displacement pumps pumping fluid by using gears. The gearscome in and out of mesh, creating a pumping non-pulsating action.Gear pumps are able to pump at high pressures and excel at pumping high viscosity liquidsefficiently.Delving into the workings of a gear pump?If we take a look at the intake side of a gear pump we’ll see the gears becoming unmeshed.This unmeshing produces a suction action which in turn forces the fluid into the volumepockets.The fluid is then transported to the discharge side of the pump.Fluid is trapped with an external gear pump. The liquid is transported to the pump’sdischarge side which can be found between the interior pump casing and gear teeth. For aninternal pump the fluid is trapped and carried between the external and internal gears teeth tothe discharge side.The meshing of gears on the discharge side of the pump forces the fluid out under pressure.Gear pumps, what types are there?There are basically two types of gear pumps – internal and external. They actually sharemuch in common. Firstly they both have an idler gear which is driven by the driving gear.Secondly, they also work by gears coming in and out mesh. This creates the pumping action.The difference between the two types is relatively simple. It’s to do with the placement of thegears and where the liquid is trapped.The internal gear pump has an external gear with a smaller internal gear inside of it. Sincethe internal gear is smaller when the gears come out of mesh on the intake side it creates
  2. 2. pockets, between the external and internal gears’ teeth, which is where the fluid istransported.Internal gear pumps are ideal for pumping high viscosity fluids, but pumping large solids candamage the pump. Internal gear pumps are ideal for pumping high viscosity fluids. Thedownside of them is that they pumping large solids damages the pump.Rotating against each other are external gears which are identical. It’s these which create thepump action. The fluid travels from the intake to the discharge side of the pump between thegears’ teeth and pump casing. External gear pumps used more for application that call forhigh pressure.Michael Smith Engineers are experienced in chemical pumps

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