How to choose dust removal accessories instead of filter elements

1、 The inevitable solid particle pollutants replaced by the filter element do great harm to the hydraulic and lubrication system. Each hydraulic and lubrication system has its own low requirements for the content of pollutants in the oil, that is, the target cleanliness of the system. When the content of solid particle pollutants is lower than the target cleanliness of the system, the system can operate normally and well. When the content of solid particle pollutants is higher than the target cleanliness of the system, the working performance, working reliability and working life of the system will be affected. Due to the invasion of the outside and the generation of the inside, many solid particle pollutants are inevitably added in the operation of the hydraulic system. Therefore, the hydraulic system must continuously remove solid particle pollutants in order to ensure the realization of the target cleanliness of the system. The filter element in the filter is to complete the function of removing particulate pollutants. The filter element is a filter element made of porous filter material. It intercepts the solid particles in the system medium through surface interception and curved pore adsorption, so as to achieve the purpose of purifying the medium. At the same time, the intercepted solid particles block the medium channel of the filter element, increasing the pressure difference at both ends of the filter element. When the pressure difference between the two ends of the filter element reaches its limit, the filter element cannot continue to work and needs to be replaced. It can be seen that the filter element is a consumable part in the system. At present, many large metallurgical equipment in China are imported, and the original filter element generally adopts expensive foreign products. After the original filter element is used up, most users want to use domestic alternative filter elements with low price and convenient supply. In addition, the filter element used in domestic metallurgical equipment designed and produced many years ago may also need to use alternative filter elements produced by non original manufacturers. Therefore, the use of filter element instead of products is inevitable.

2、 Steps for selecting alternative filter elements

1. The target cleanliness of the hydraulic and lubrication system is given by the manufacturer of the equipment. Users can know as long as they check the original technical data of the equipment. When using the original filter element to maintain the cleanliness of the system, the user can check the use of the original filter element through the detection of the system medium pollution; Whether the core can meet the requirements of the target cleanliness of the system. If the cleanliness of the system is qualified, it is necessary to analyze the reasons. If the performance parameters of the original filter element are too poor to reach the target cleanliness of the system, it is necessary to discuss with the manufacturer of the alternative filter element to improve the performance parameters of the alternative filter element. In short, the use of alternative filter elements must ensure the realization of the target cleanliness of the system.

2. Provide details of the original filter element · if the user wants to use a satisfactory and qualified alternative filter element, he must provide details of the original filter element and provide a new or old original filter element. In this way, the manufacturer of alternative filter element can fully understand and master the performance parameters and size parameters of the original filter element, so as to obtain a satisfactory alternative filter element. Table 1 lists the technical data related to the filter element. The quality and structural size can be easily judged by observation and trial assembly, and the performance parameters of the filter element, such as filtration accuracy, pollutant carrying capacity and initial differential pressure, can only be known after being tested by corresponding inspection standards. Therefore, the user must ask the alternative filter element manufacturer to show the corresponding experimental results. Conditional users can also test the performance of the filter element by themselves or through a third party. Of course, users can also judge the quality of the alternative filter element by detecting the cleanliness of the system after the alternative filter element is used.

1. Collect data 1.1 samples and samples of relevant products;

1.2 original production drawing, manufacturer (company) name, product prototype number and other data of the product;

1.3 working principle of the whole system.

2. Learn about the filter element

2.1 installation position, connection form and sealing mode of the product;

2.2 the use position of the product in the system;

2.3 technical parameters of the system where the product is located flow working pressure working temperature working medium

3. On site mapping, differential pressure, filtering accuracy, etc

3.1 basic principle: try to bring samples (new or old) back to the company for surveying and mapping;

3.2 basic elements that must be clear

3.2.1 see the basic structure clearly and draw the general structure drawing;

3.2.2 carefully measure and mark the assembly size and other key dimensions, including: total length, outer diameter, threaded connection size, seal size, key surface roughness and matching requirements, and relevant dimensions of bypass valve (understand the opening pressure);

3.3 filter material conditions include: filter material properties and accuracy (material, brand, etc.); Folding height and number of filter materials (corrugated type); Structural form of filter material (corrugated type, mesh enclosure type, sealing connection size, stress skeleton thickness (whether there is support), skeleton aperture and hole spacing whether there is support mesh); Filter material of filter screen: material (carbon steel, copper, stainless steel, etc.), mesh wire diameter, pore diameter (or mesh number); Flow direction of medium on filter material

3.4 if two persons are on the surveying and mapping site, they shall check each other; Key points of proofreading:

a. Assembly dimensions: external connection, seal and thread;

b. Technical requirements (key);

c. Key materials: filter materials;

d. Structural form

e. The product model and user name shall be indicated in the general drawing to avoid mistakes.

Equipment name hydraulic system working pressure working temperature using medium target cleanliness existing cleanliness filter manufacturer filter model filter element manufacturer filter element model nominal filtration accuracy absolute filtration accuracy flow pollutant carrying capacity initial pressure difference inner diameter outer diameter height discount number filtration area filter material type end cover size skeleton size support ring size seal Ring size sealing ring material filter element remarks whether there is original filter element whether there is new filter element whether there is old filter element whether there is

3、 Inspection of alternative filter element after providing detailed information about the original filter element, the user should conduct a comprehensive inspection of the alternative filter element to confirm whether the alternative filter element meets the requirements. Generally speaking, the filter element complies with seven international standards. Iso2941 filter element rupture resistance test iso2942 filter element structural integrity test iso2943 filter material and liquid phase objectivity test iso3723 filter element rated axial load test iso3724 flow fatigue characteristic curve iso3968 flow characteristic curve iso4572 has passed the test for many times

4、 If the filter element meets the seven international standards, then we can safely choose our domestic filter element with excellent quality, reasonable price and production cycle meeting the requirements, then place the order... Ordering unit ordering quantity ordering person medium model system pressure filter element through the position of flow filter element in the system, oil suction pipeline, oil pressure pipeline Filter accuracy of pressure filter material at the filter element of oil return pipeline.