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GB/T 20079-2006: Hydraulic fluid power -- Filters -- General specification Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 20079-2006: Hydraulic fluid power -- Filters -- General specification---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20079-2006GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.100.30 J 20 Hydraulic fluid power - Filters - General specification Issued on: JANUARY 23, 2006 Implemented on: AUGUST 01, 2006 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Classification... 6 5 Technical requirements... 7 6 Test requirements... 10 7 Inspection requirements... 11 8 Marking, packaging and storage... 13 9 Notes (reference to this Standard)... 14 Hydraulic fluid power - Filters - General specification1 ScopeThis Standard specifies the general technical requirements for hydraulic filters (hereinafter referred to as filters), as well as the requirements for testing, inspection, marking, packaging and storage. This Standard applies to filters that use hydraulic oil as the working medium.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB/T 193-2003, General purpose metric screw threads - General plan GB/T 2346, Fluid power systems and components - Nominal pressures (GB/T 2346-2003, ISO 2944.2000, MOD) GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads (eqv ISO 228-1.1994) GB/T 17446, Fluid power systems and components - Vocabulary (GB/T 17446- 1998, idt ISO 5598.1985) GB/T 17486, Hydraulic fluid power - Filters - Evaluation of differential pressure versus flow characteristics (GB/T 17486-1998, idt ISO 3968.1981) GB/T 18853, Hydraulic fluid power filters - Multi-pass method for evaluating filtration performance of a filter element (GB/T 18853-2002, ISO 16889.1999, MOD) GB/T 18854, Hydraulic fluid power - Calibration of automatic particle counters for liquids (GB/T 18854-2002, ISO 111171.1999, MOD) ISO 6162-1, Hydraulic fluid power - Flange connections with split or one-piece flange clamps and metric or inch screws - Part 1.Flange connectors, ports and mounting surfaces for use at pressure of 3.5 MPa (35 bar) to 35 MPa (350 bar), DN 13 to DN 127 ISO 6162-2, Hydraulic fluid power - Flange connections with split or one-piece flange clamps and metric or inch screws - Part 2.Flange connectors, ports and mounting surfaces for use at pressure of 42 MPa (420 bar), DN 13 to DN 763 Terms and definitionsFor the purpose of this Standard, the following terms and definitions, as well as those given in GB/T 17446, apply. 3.1 filtration ratio The ratio of the number of pollutant particles larger than a given size x (c) per unit volume of oil upstream and downstream of the filter, represented by βx (c). That is. βx(c)=Nu/Nd Where. Nu – the number of particles larger than x microns contained in a unit volume of oil upstream of the filter. Nd – the number of particles larger than x microns contained in the unit volume of oil downstream of the filter. Note 1.βx(c) represents the filter's ability to filter particles larger than size x. Note 2.The subscript “(c)” in βx(c) indicates that βx is measured and calculated using an automatic particle counter calibrated in accordance with GB/T 18854. Without this subscript, βx is measured and calculated using a particle counter calibrated by other methods. 3.2 filtration rating The minimum particle size x(c) that the filter can effectively capture (when βx(c) ≥ 100), measured in microns, expressed in μm. 3.3 dirt capacity (retention capacity) The total amount of pollutants retained by the filter element when the pressure drop reaches the specified limit pressure drop, measured in grams, expressed in g. 3.4 c) Pressure line filter. filter installed on the pressure line.5 Technical requirements5.1 Basic technical parameters 5.1.1 Filtration rating The filtration rating of the filter shall comply with the requirements of the product technical documents. The filtration rating (μm (c)) should be selected from 3, 5, 10, 15, 20, 25, and 40.When the filtration rating is greater than 40 μm (c), it shall be determined by the manufacturer. 5.1.2 Rated flow The filter rated flow (L/min) should be selected from the following grades. 16, 25, 40, 63, 100, 160, 250, 400, 630, 800, 1 000. When the rated flow is greater than 1 000 L/min, it shall be determined by the manufacturer. 5.1.3 Nominal pressure The nominal pressure of the pressure line filter shall be selected according to the provisions of GB/T 2346. 5.1.4 Dirt capacity The dirt capacity of the filter at rated flow shall be specified in the product technical documentation. 5.1.5 Indicating pressure drop For filters equipped with a transmitter, the indicating pressure drop shall be indicated in the product technical documentation. 5.1.6 Bypass valve 5.1.6.1 Bypass valve cracking pressure drop For filters equipped with a bypass valve, the cracking pressure drop shall be indicated in the product technical documentation. 5.1.6.2 Bypass valve sealing performance 5.5.4 When the filter is equipped with a bypass valve, the design structure shall prevent the deposited pollutants from passing directly through the bypass valve. 5.5.5 The filter surface shall not have defects such as crushing, cracks, corrosion, burrs, etc. The surface coating is not allowed to crack, peel or flake off during normal storage, transportation and use. 5.6 The filter shall be subjected to the specified factory cleanliness index, and all oil ports shall be installed with dust covers when leaving the factory.6 Test requirementsUnless otherwise specified, the working medium and measurement accuracy of the filter test shall comply with the provisions of GB/T 18853. 6.1 Filtration rating test The filtration rating test shall be carried out in accordance with the provisions of GB/T 18853.The indicators shall comply with the requirements of 5.1.1. 6.2 Dirt capacity test The dirt capacity test shall be carried out in accordance with the provisions of GB/T 18853.The indicators shall comply with the requirements of 5.1.4. 6.3 Indicating pressure drop test The test device shall comply with the provisions of GB/T 17486.Install the indicator to be tested; use a special plug to replace the filter element; use the test fluid to slowly pressurize the filter inlet until the indicator works. At this time, the inlet pressure value shall comply with the requirements of 5.1.5. 6.4 Bypass valve cracking pressure drop test 6.4.1 The test device shall comply with the requirements of GB/T 17486.Install the bypass valve in a special test fixture; connect the bypass valve inlet to the test oil pump; connect the bypass valve outlet to the atmosphere; use the test oil pump to pressurize the bypass valve until the pressure reaches 80% of the cracking pressure drop specified in 5.1.6.1; maintain the pressure for 3 minutes. The leakage of the bypass valve shall comply with the requirements of Table 1. 6.4.2 Continue to increase the pressure according to the method in 6.4.1 until the pressure reaches the cracking pressure drop specified in 5.1.6.1.The leakage of the bypass valve shall comply with the requirements in Table 1. 6.5 Bypass valve closing pressure drop test According to the test method in 6.4.2, after the bypass valve is opened, gradually reduce the pressure by 7 kPa each time until it reaches the pressure drop specified in 5.1.6.3. At this time, the leakage of the bypass valve shall comply with the requirements of 80% cracking pressure drop in Table 1. 6.6 Bypass valve pressure drop flow test The test device shall comply with the requirements of GB/T 17486.Replace the filter element with a special plug; start the oil pump; adjust the test flow; when the flow reaches the rated flow of the filter, measure the pressure drop of the bypass valve. Its performance shall comply with the requirements of 5.1.6.4. 6.7 Filter clean pressure drop test The test shall be carried out in accordance with the provisions of GB/T 17486.Its performance shall comply with the requirements of 5.1.8. 6.8 Compatibility test Immerse the filter in oil at 135 °C for 72 hours. After inspection, its performance shall comply with the requirements of 5.2.2. 6.9 Filter low-pressure sealing property test Fill the filter cavity with test oil; block the filter outlet; pressurize the inlet to 15 kPa and maintain for 3 minutes. Its performance shall comply with the requirements of 5.3.1. 6.10 Filter high-pressure sealing property test Pressurize the filter inlet according to the test method in 6.9 until it reaches 1.5 times the nominal pressure; maintain it for 2 minutes. Its performance shall comply with the requirements of 5.3.2. 6.11 Filter burst pressure test Pressurize the filter inlet according to the test method in 6.9 until it reaches 3 times the nominal pressure; maintain it for 1 minute. Its performance shall comply with the requirements of 5.3.3. 6.12 Filter pressure flow characteristics test The filter pressure flow characteristics test shall be carried out in accordance with the provisions of GB/T 17486.7 Inspection requirements7.1 The inspection of filters is divided into ex-factory inspection and type inspection. and technical requirements shall be carried out as specified in Table 3.In any of the following cases, type inspection shall be carried out. a) Trial production and evaluation of new products or old products transferred to other factories for production; b) When there are major changes in structure, materials, or processes that affect product performance; c) When there is a significant difference between the ex-factory inspection result and the last type inspection result; d) When the national quality supervision agency proposes a requirement for type inspection.8 Marking, packaging and storage8.1 Eye-catching inlet and outlet markings shall be made near the inlet and outlet of the filter. 8.2 Permanent markings shall be set on the filter housing, including. -- Product model; -- Nominal pressure; -- Rated flow; -- Filtration rating; -- Name of the manufacturer; -- Factory serial number and other relevant data. 8.3 Each product shall be accompanied by a product certificate signed by the quality inspector. 8.4 The factory packaging of the product shall ensure that the product will not be damaged during normal transportation. 8.5 Packing documents include. packing list, certificate of quality, and product instruction manual. 8.6 The following information shall be marked on the outer surface of the product packaging box. -- Manufacturer’s name and address; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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