Hydraulic Filters – Construction and Specification

Textbook on ‘Hydraulic Filters Construction Installation Locations and Specifications

By Joji Parambath

The textbook presents information on the construction, installation locations, and specifications of hydraulic filters, in detail.

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Hydraulic filters need to be the integral parts of every hydraulic system to ensure the proper operation of the pumps, valves, and actuators in the system. As the requirements of hydraulic systems are demanding, the prescribed cleanliness levels of their fluid media must be achieved under all operating conditions. For this reason, it is essential to understand the different types of hydraulic filters and their performance ratings.

Filters are necessary devices for removing particulate contamination from hydraulic systems. A filter consists of (1) Filter head, (2) Filter bowl, and (3) Filter element. A filter element (or cartridge) is usually made up of steel wire screen, cellulose media, or synthetic glass fibre media. It consists of millions of tiny pores of micron sizes. A filter housing encloses the filter element. It also confines the system fluid within the unit. A filter head holds the filter element and its housing.

Performance Ratings of Hydraulic Filters

The degree of cleanness achieved by the fluid used in a hydraulic system can be linked to the performance of the filter elements used in the system. These elements are rated based on their ability to separate the contaminants of particular sizes from the system fluid, under the specific test conditions. Filter manufacturers publish various filter performance data. The basic parameters specified by the filter manufacturers are the mesh number, Beta (ß) Ratio, filter efficiency, and/or the micron ratings. Besides, there exists an industry-standard called the ‘multi-pass test’ to measure the performance ratings of filters effectively.

The details of cartridge filters, spin-on filters, in-tank filters, in-line filters, duplex filters, off-line filters, and many accessories, such as clogging indicators, bypass valves, and magnets, are systematically explained in the book. The details of the performance ratings and specifications of hydraulic filters are also presented in the book, in detail.

Joji Parambath


Fluidsys Training Centre Pvt Ltd

Bangalore, India


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