The role of hydraulic filters

The role of hydraulic filters

Hydraulic oil is the most important part of every hydraulic system, and in a hydraulic system, no system can be operated without the proper volume of hydraulic oil. In addition, any change in fluid level, fluid characteristics, etc. can damage the entire system we are using. If hydraulic oil is so important, what if it is contaminated?

The risk of hydraulic oil contamination increases as the amount of hydraulic system usage increases. Leakage, rust, aeration, cavitation, seal damage, etc., will contaminate the hydraulic oil. The problems created by such contaminated hydraulic fluids can be divided into degradation, transients and catastrophic failures. Downgrade is a fault classification that affects the proper functioning of hydraulic systems by slowing down the running speed. Transients are intermittent faults that occur irregularly. Finally, catastrophic failure is the entire end of the hydraulic system. The problem of contaminated hydraulic oil can become more serious.

Hydraulic oil filtration is the only solution to eliminate contaminants from fluids in use. Particle filtration using different types of filters will remove contaminant particles such as metals, fibers, silica, elastomers and rust from hydraulic fluids.

1. What is a hydraulic filter?

A hydraulic filter is a component of the hydraulic system used to continuously remove contaminants from hydraulic oil. This process purifies the hydraulic oil and protects the system from damage caused by particulate matter. Select application-specific hydraulic filter types based on fluid compatibility, application type, pressure drop, operating pressure, size, design, etc.

Hydraulic filters are located in different parts of the hydraulic system and prevent contaminant particles from entering the system. Air filters, suction filters, pressure filters, oil return filters and offline filters are some common hydraulic filters.

Except for offline filters, the basic working principle of hydraulic filters is similar. Usually, the working fluid in the hydraulic system will enter through the inlet of the hydraulic filter and pump out through the outlet of the hydraulic system after filtration. As a result of continuous operation, the deposition of dirt particles at the inlet of the filter element will create a pressure difference at the inlet and outlet of the filter. When this pressure difference is sensed by the bypass relief valve, the valve opens and flows the fluid directly from the inlet to the outlet by giving an indication to replace/clean the filter.

2. Why use hydraulic filters?

Hydraulic filters are mainly used in various hydraulic systems in industry. These filters have many advantages to ensure that the hydraulic system works safely. Some of the advantages of hydraulic oil filters are listed below.

　1. Eliminate the existence of foreign matter in hydraulic oil.

2. Protect the hydraulic system from the harm of particulate pollutants.

3. Improve overall efficiency and productivity.

4. Compatible with most hydraulic systems.

5. Low maintenance cost

6. Extend the service life of the hydraulic system.