Overpresurization in Hydraulic Pumps: Causes and Effects – MindofAll

Overpresurization in Hydraulic Pumps: Causes and Effects

Hydraulic Pumps provide an important service to the machines that they power. They add pressure to a machine’s working fluid, which increases the force that can be applied by that fluid.

This increased force can improve efficiency and allow for greater speeds, more power, and more precise movements than otherwise possible with just gravity pulling on the working fluid as it flows through pipes.

Overpresurisation—when a hydraulic pump is working too hard or has too much pressure running through it, any mechanic should keep in mind when checking out any piece of machinery with hydraulics in it.

This guide covers what overpressurisation means for different types of hydraulic pumps, how it happens and why it occurs so often. From there, we’ll go into some ways to prevent overpressurisation from happening in the future!

Hydraulic Pumps

Pressure relief valves

When a hydraulic system operates at or above its normal operating pressure, the pressure relief valve will open to relieve the excess pressure. Typically, there are two types of relief valves: single-acting and double-acting.

Single-acting relief valves are spring-loaded to shut off after a specific amount of time once tripped.

This means that if you just have one single-acting relief valve for your entire system, it will only open when there is too much pressure in your Hydraulic Power Units and then close again when the excess pressure has been released.

Packing gland leaking

  • Causes

There are several possible causes of packing gland leakage. The most common reason is a manufacturing defect or assembly error. If you have a new pump, check the packing gland for damage before installation to ensure it was not damaged during shipment. Other possible causes include:

  • Improper maintenance – If you fail to perform regular maintenance on your hydraulic system, it may break down prematurely due to wear and tear or simple neglect.
  • It’s important that you keep up with all preventative maintenance tasks as they’re scheduled so that any issues can be addressed before they become serious problems.
  • Use in harsh environments – Hydraulic pumps should only be used in an environment where there is no risk of overheating or freezing temperatures.
  • Using these pumps outside their intended range could cause serious damage due to overheating or freezing, which will lead to premature failure down the road.
  • It’s also important not use these pumps in corrosive environments because this type of fluid can eat away at various components over time, causing additional problems within the system such as leaks around seals etc.

Excessive pressure at pump outlet

Leaking packing gland in the stuffing box of a pump. This is where the piston rod moves through a stuffing box, and oil is pumped into it to lubricate the seal on its outer surface.

When this occurs, there is no longer any sealing action between the inner surface of the packing and shaft sleeve, causing leakage. The remedy is to replace or repair worn parts, such as shaft sleeves and new packing rings if necessary.


In conclusion, we can say that overpressurisation is a serious condition that must be addressed as soon as possible. The best way to avoid it is to regularly inspect your hydraulic pump and replace worn parts when necessary.

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