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Published On: Wed, Feb 12th, 2014

Animation – How an axial flow variable displacement piston pump works.

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Hydraulic pumps are of various types axial flow variable displacement piston pump are used in heavy hydraulic construction equipments. Tracked excavator machines commonly use this type of pumps. The advantage of this pump is that, the flow is variable compared to gears pumps in which we have fixed flow.

In this video we have explained all the components of the pump and how each components contribute to its working, you can see how the flow can be varied using the swash plates and how the pistons move inside the rotting cylinder block. Please watch the entire video and learn it and give your opinion about the video.

Major components of a Piston pump:

  1. Casing
  2. Drive shaft
  3. Cylinder block
  4. Swash plate
  5. Swash plate adjusting valve.

animation how an axial flow variable displacement piston pump works working principle swash plate
Casing: It’s the metallic covering or body of the pump

Drive shaft: this is the shaft which is getting the drive

Cylinder block: It’s the part that gets the drive from the drive shaft. Its have many number of drilled holes to which the pump pistons are reciprocating.

Swash plate: it’s the plate or disc on which the pistons are sliding and rotating. The change in angle of the swash plate is creating the flow.

Swash plate adjusting valve: it’s the valve which pressurises to change the swash plate angle.

Working of a piston pump explained:

As you know the piston pump is an axial flow variable displacement pump. It’s called as variable flow pump because; unlike the gear pump, here the flow can be varied. It depends on the angle of the swash plate.

See the piston pump working animation video embedded here from YouTube to get sound knowledge on its working.

The swash plates are stationary and when they are vertical, there is no flow happening, as there will not be any reciprocating motion of the pistons. As the swash plate angle changes as shown in the video the upper pistons created a suction of the oil and the lower pistons creates the delivery. So its a cyclic process. The cylinder is rotating and the piston rotate on the swash plate and at the same time reciprocates depending on the swash plate angle. This reciprocation of the pistons create the suction and the delivery.

If you have any doubt please feel free to drop a comment, we will respond.

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