How to choose filter element in hydraulic industry?

One. Filter element is an indispensable consumption in hydraulic system.

Solid particle pollutant does great harm to hydraulic lubrication system. Each hydraulic and lubrication system has its own minimum requirements for the amount of contaminants in the oil-system target cleanliness. When the content of solid particles is lower than that of the system, the system can work well; When the content of solid particles is higher than the systematic target, the performance, reliability and service life of the system will be affected.

Because internal production hydraulic system will inevitably add a lot of solid particle pollution during operation, and because of outside invasion, hydraulic system must constantly remove solid particle contaminants so as to ensure the realization of target cleanliness.

The filter element is made of porous material. The solid particles in the system medium are trapped by surface interception and the adsorption of curved holes so as to achieve the purpose of purifying the medium. At the same time, the trapped solid particles may block the media channel of the filter element and make the pressure increase. When pressure reaches to extremity, the filter element cannot continue to work and needs to be replaced. Thus, the filter element is a consumable part of the system.

Two. Steps to select alternative filter elements

1. Check the current situation of medium cleanliness

The target cleanliness of the hydraulic and lubricating systems is given by the manufacturer of the equipment., users can know it from raw technical data of the equipment. When using the original filter element to maintain the cleanliness of the system, users can check whether original filter element can meet the system target cleanliness requirements by detection of contamination of system media. If the system cleanliness is qualified, the reasons need to be analyzed.

2. Provide detailed information of the original filter element

To use a satisfactory alternative filter element, users must provide details of the original filter element and new or old original filter elements. In this way, it can help the manufacturer of alternative filter element to fully understand and master the performance parameters and dimension parameters of the original filter element, so as to obtain a satisfactory alternative filter element.

The quality, size, and structure can be easily judged by observation and trial assembly, but filtration accuracy, absorption capacity, initial pressure and other performance parameters can only be known after passing the corresponding inspection standards. Thus the users must ask the manufacturer of the replacement filter element to show the corresponding experimental results. Qualified users can also test the performance of the filter element by themselves or through a third party. Of course, users can also check the cleanliness of the system after the use of the alternative filter element to judge the quality of the alternative filter element.

A. Collecting data

Samples, original production drawing, Name of manufacturer (company), original product model, working principle for whole system, etc.

B. Know about the filter element

Installation, connection, sealing of product;

Where the product is used in the system;

Technical parameters(flow rate, working pressure, working temperature, working medium).

C. On-site mapping (differential pressure, filtration rate, etc.)

Basic principles: try to bring samples (new or old) back to the company and make maps

Necessary basic factors: A. See basic structure clearly and make a general layout structure; B. Carefully measure and indicate dimensions including overall length, outside diameter, thread connection dimensions, sealing element dimensions, key surface roughness and fitting requirements)

Filter material: properties, accuracy, thickness of stressed skeleton, etc.

Mesh filter: material, pore size, flow direction of the filter medium, etc.

Proofread (A. If there is a lover at the surveying and mapping site, proofread each other; B. Proofread key points: assembly size, external connection, sealing, thread, key materials, structural form, product model)


Post time: Dec-14-2019