A hydraulic filter is a component used by hydraulic systems to continuously remove contaminants in the hydraulic oil. This process will purify the hydraulic fluid and protect the system from damages created by the particle contents. Hydraulic filter type for a specific application is selected on the basis of its fluid compatibility, application type pressure drop, operating pressure, size, design, etc
Return-line hydraulic filters, sometimes called spin-on filters, are used to clean hydraulic oil or fluid in pressurized hydraulic systems. In-line hydraulic filters are installed on the low-pressure, return line side of a hydraulic system to clean fluid before it returns to the reservoir.