Hydraulic pumps – different types and purposes explained!

Hydraulic pumpsHydraulic pumps are pumps that we use in hydraulic drive systems. They can either be hydro-static or hydrodynamic. These are some of the most commonly used hydraulic pumps nowadays:
External Gear Pump

External gear pumps are types of hydraulic pumps usually used in mobile and industrial hydraulic applications. This means machine tools, oil pumps in engines and fluid power transfer units. In this type of hydraulic pumps only one of the gear wheels in connected to the drive. The other wheel just rotates in the opposite direction. In this way, their teeth interlock.
These are the several advantages of an external gear pump:

  • Low cost
  • Low weight
  • Wide range of speeds
  • Wide temperature and viscosity range
  • Relatively high working pressures

Hydraulic pumps – different types and purposes explained!

Internal Gear Pump

These are types of hydraulic pumps that we use in non-mobile hydraulics. For example, vehicles that operate in an enclosed space. These kinds of hydraulic pumps are capable of handling thick fluids and are versatile.

The gear rotor in an inter gear pump is connected to the drive. They create volume, when the internal gear and the gear rotor rotate. The operation has a constant flow and is exceptionally quiet.

These are the several advantages of an internal gear pump:

  • High efficiency
  • Low operating noise
  • Low flow pulsation

Rotary Vane Pump

Rotary Vane PumpThe rotary vane pump is a type of hydraulic pump that finds in use in land and road construction machinery. This pump operates with much lower flow pulsation compared to the previous two. This means that it has a constant flow while maintaining a relatively high speed.

Hydraulic vane pumps operate with much lower flow pulsation, i.e. constant flow. As such, vane pumps produce less noise while maintaining a relatively high speed.

These are the several advantages of a rotary vane pump:

  • Wide viscosity range
  • Wide range of speeds
  • Very low noise levels
  • Low flow pulsation

Swash Plate Piston Pump

Swash Plate Piston PumpSwash pate piston pumps are very specific types of hydraulic pumps. These hydraulic pumps have a rotating cylinder that contains pistons. A spring pushes the pistons against a stationary swash plate, thus the name. During half a revolution the pistons such in fluid and push fluid out during the other half. A swash plate piston pump can be of fixed or a variable displacement.

Hydraulic pumps and their working principles!

Radial Piston Pump

Radial piston pumps are types of hydraulic pumps that we usually use in applications that involve high pressures. Such are the machines that process plastic and machine tools that clamp hydraulics. These pumps are the only ones that can work satisfactorily at very high pressures, even when the operation is continuous.

Hand pump

Hand pumps as the name suggests are manually operated pumps. These pumps use human power to move fluids from one place to another. We use them for a varety of marine, industrial and leisure activities. There are, of course, many different types of hand pumps. However, most of them use the same basic working method.

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