Air in a closed hydraulic system can cause several problems, including reduced efficiency, noise, and even component damage. Fortunately, there are several methods to remove this air.
1. Venting
The most common method is venting. This involves opening a vent valve at the highest point of the system, allowing air to escape while the system is running. Venting should be done until only hydraulic fluid is seen exiting the vent.
2. Bleeding
Bleeding is another effective method. This involves opening bleed valves at specific points in the system, allowing air to escape while the system is running. Bleeding is often done at actuators, cylinders, and other components.
3. Vacuum De-aeration
For more complex systems, vacuum de-aeration can be used. This method involves creating a vacuum in the system, which draws out air bubbles. This method is often used during initial system filling.
4. Using a Hydraulic Filter
Hydraulic filters can also help remove air from the system. These filters have a specific design that traps air bubbles within the filter element.
5. Using a Hydraulic Fluid Conditioner
Hydraulic fluid conditioners can also help remove air from the system. These conditioners are added to the hydraulic fluid and help reduce the size of air bubbles, making them easier to remove by other methods.
By using one or more of these methods, you can effectively remove air from your closed hydraulic system and ensure its optimal performance.
