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How do you guarantee the external tightness of hydraulic motors?

What are the external sealing conditions for hydraulic motors and how do you deal with them? We'll tell you here!

Like any equipment that uses liquid, hence the term hydraulic, hydraulic motors are subject to the problem of external or internal leakage or loss of leakage. Hydraulic equipment is sensitive, so you need to keep a close eye on these leaks. But how does it work? We'll cover the subject here!

Hydraulic motors in a nutshell

A hydraulic motor is also known as an isothermal motor. Basically, its purpose is to generate mechanical energy by channelling and directing a hydraulic source, often a special liquid. The conversion of pressurised liquid into mechanical force is known as hydrostatic transmission. This is the basis of the engine we are talking about today.

The act of generating power in this way uses fluid pressure. To do this, the engine does not work alone, so to speak. It is the combination of pumps, valves and other reservoirs that enable these fluids to be put under pressure. These fluids are then channelled towards the engine to produce mechanical energy and keep it running. The movement thus created is sent to a load. The mechanical energy generated is then transformed into the rotational movement of the output shaft. Depending on their nature and function, a motor can perform a rotary or linear movement.

This transformation is known as reversible. This is a characteristic of most hydraulic motors.

Despite the specific features of each type of motor, the principle remains the same. As we saw earlier, the aim is still to convert liquid energy into mechanical power to drive the motor. Then it's up to the motor to power the machine for which it generates the work force!

There are generally four types of hydraulic motor. They fall into three main categories:

  • High-speed motors
  • Semi-fast motors
  • Slow motors

Depending on the use or nature of the motor, it will be classified in one of these three categories.

As a general rule, motors can perform rotary or linear actions. This is one way of differentiating them.

Let's now look at our external sealing problem. It's this way!

External sealing in hydraulic motors

In a hydraulic system, it's the pump and motor that accumulate the greatest risk of leakage. It is in these components, such as valves and others, that external leakage can be felt and caused. The main cause is material failure, such as leaking fittings or other leaks. These ruptures and leaks are generally easy to detect because they are accompanied by external leakage. Regular maintenance and observation of machinery can generally prevent leaks, both internal and external.

They must be dealt with quickly once the damage has been detected. A loss of seal has an impact on the productivity of the motor or pump, since it causes a loss of liquid. A loss of seal also has an impact on the overall operation of the engine, since liquids can spill into other parts and damage them, sometimes seriously.

Scrupulous monitoring and regular replacement of worn valves is of vital importance in preventing serious damage. So here we have looked at the problems associated with the external sealing of hydraulic motors. We hope we've been of some help!

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