Type of hydraulic filter
The following are the most common filters in the hydraulic system circuits. When selecting replacement filters, the location of each filter in the system and the pressure at that location are important considerations.
Low pressure filter
These can be found in most hydraulic systems, usually between the oil tank and the pump, and in line during the return stroke of the hydraulic oil tank. Low pressure hydraulic filters are normally rated at 24 bar/350 psi. The main purpose of the filter is to prevent large pollutants from entering the pump.
Medium pressure filter
Medium pressure filters are usually designed as in-line components, which can be either spin on or cartridge type. They are usually rated at 20 – 138 bar/90 – 2000 psi. Typically, these filters are used to collect debris generated during plant operation.
High pressure filter
High pressure cartridge filters are usually located between the pump and motor, cylinders and valves and are designed to provide maximum protection. They help protect these critical components from catastrophic (and expensive) failures. High pressure filters are typically rated between 130 bar/1885 psi and 450 bar/6500 psi (or higher).
