GB/T 20080-2017General specification for hydraulic filter elements (English PDF)
液压滤芯技术条件
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Level / Type
National · Recommended
Issue date
May 12, 2017
Implementation date
December 1, 2017
Scope
GB/T 20080-2017 is the English-translated version of 液压滤芯技术条件.
GB/T 20080-2017 gives the general technical conditions for hydraulic filter elements together with the test, inspection, marking, packaging and storage requirements, and applies to filter elements working with hydraulic oil.
Elements are grouped by where they are installed - suction, return, pressure line or combined - and by filter material, from glass fibre and plant fibre paper to metal wire mesh, chemical fibre, metal fibre felt, sintered powder and polymer materials.
The performance clauses cover filtration ratio, with the particle size chosen from 4, 6, 10, 14, 20 and 25 µm(c), dirt holding capacity, structural integrity, compatibility with the working medium and pressure drop against flow.
Tests refer to GB/T 18853, GB/T 14041.1 to GB/T 14041.4, GB/T 17486 and GB/T 17488. It replaces GB/T 20080-2006, was issued on 12 May 2017 and has applied since 1 December 2017.
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Document preview — GB/T 20080-2017
National Standard of the People's Republic of China
- ICS
- 23.100.60
- Classification
- J 20
- Replacing
- GB/T 20080-2006
Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Terms and definitions6
- 4 Classification6
- 5 Technical requirements7
- 6 Test requirements9
- 7 Inspection requirements10
- 8 Marks, packaging, storage11
- 9 Notes (reference to this Standard)12
1 Scope
This Standard specifies the general technical conditions for hydraulic filter elements (hereinafter referred to as filter elements), as well as the requirements for testing, inspection, marking, packaging and storage.
This Standard applies to filter elements that use hydraulic oil as the working medium.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1184-1996, Geometrical tolerancing -- Geometrical tolerance for features without individual tolerance indications
GB/T 1800.2-2009, Geometrical product specifications (GPS) -- Limits and fits -- Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts
GB/T 14041.1, Hydraulic fluid power -- Filter elements -- Part 1: Verification of fabrication integrity and determination of the first bubble point
GB/T 14041.2, Hydraulic fluid power -- Filter elements -- Part 2: Verification of material compatibility with fluids
GB/T 14041.3, Hydraulic fluid power -- Filter elements -- Part 3: Verification of collapse/burst pressure rating
GB/T 14041.4, Hydraulic fluid power -- Filter elements -- Part 4: Method for rated end load test
GB/T 17446, Fluid power systems and components -- Vocabulary
GB/T 17486, Hydraulic fluid power -- Filters -- Evaluation of differential pressure versus flow characteristics
GB/T 17488, Hydraulic fluid power -- Filter elements -- Determination of resistance to flow fatigue using particulate contaminant
GB/T 18853, Hydraulic fluid power filters -- Multi-pass method for evaluating filtration performance of a filter element
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 17446 as well as the followings apply.
3.1 Filter element rated flow
The flow rate that a clean filter element can pass under the specified oil kinematic viscosity (generally 32 mm²/s) and specified pressure drop.
3.2 Filter element pressure drop
When oil passes through the filter element, a pressure difference between the upstream and downstream of the filter element.
3.3 Filter element characteristics of pressure drop versus flow
Characteristic curve of filter element pressure drop versus flow rate.
3.4 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 element is expressed as betax (c). It is calculated using the following formula:
Where, Nu - The number of particles larger than x (c) microns contained in the unit volume of oil upstream of the filter element;
Nd - The number of particles larger than x (c) microns contained in the unit volume of oil downstream of the filter element.
4 Classification
4.1 Classification by installation location
a) Suction filter. a filter element installed in the oil suction port or oil suction filter in the oil tank;
b) Return filter. a filter element installed in the oil return port or oil return filter in the oil tank;
c) Pressure line filter. a filter element installed in the pressure line filter;
d) Other filter elements. filter elements with comprehensive performance, such as suction and return filter elements.
4.2 Classification by filter material used
a) Glass fiber filter element. the filter material is glass fiber filter material;
b) Paper filter element. the filter material is plant fiber filter paper;
c) Metal mesh filter element. the filter material is metal wire mesh;
d) Other filter elements. including chemical fiber filter element, metal fiber felt filter element, sintered powder filter element, polymer material filter element, etc.
5 Technical requirements
5.2.2 The surface of the metal parts of the filter element shall be rust-proof. The surface plating (coating) layer shall be complete, dense and beautiful.
5.2.3 The end caps shall be free of burrs, flash and weld nodules. The welds shall be firm and smooth. The end caps shall not be permanently deformed, cracked or damaged during installation and use.
5.2.4 The frame shall be free of burrs, flash and weld nodules. The rough surface shall face away from the filter material.
5.2.5 The seals shall not have obvious damage to ensure no oil leakage during installation and use.
5.2.6 The cleanliness level of the production environment shall meet the product production process requirements. The filter element shall be packaged in a plastic bag. It shall be kept clean and dry during transportation and storage.
5.2.7 Defects in filter materials can be repaired with resin or other materials that do not affect the appearance quality. The repair area shall not exceed 5% of the filter area.
5.2.8 The folds of cylindrical pleated filter elements shall be parallel to the central axis. The wave spacing shall be uniform. The number of folds shall comply with the requirements of the product drawings and special technical documents. The allowable deviation of the number of folds is ±4%.
5.2.9 The height dimension deviation of the filter element shall comply with the requirements of the shaft limit deviation js16 in GB/T 1800.2-2009.
5.2.10 The verticality deviation of the center line of the filter element to the end face shall comply with the L-level requirements in GB/T 1184-1996.
5.1 Performance parameters
5.1.1 Filtration ratio
The filtration ratio of the filter element shall comply with the requirements of the product technical documents. The particle size [µm(c)] corresponding to the filtration ratio shall be selected from 4, 6, 10, 14, 20, and 25.
5.1.2 Dirt holding capacity
At the filter element rated flow, the dirt holding capacity shall comply with the provisions of the product technical documents.
5.1.3 Structural integrity
The initial bubbling point of the filter element shall comply with the requirements of the product technical documentation.
5.1.4 Material and liquid compatibility
The filter element material shall comply with the relevant material standards or technical documents and be compatible with the working medium.
5.1.5 Pressure drop and flow characteristics
The filter element characteristics of pressure drop versus flow shall comply with the requirements of the product technical documents.
6 Test requirements
6.1 Filter element filtration ratio test
It shall be carried out in accordance with the provisions of GB/T 18853.
6.2 Filter element dirt holding capacity test
It shall be carried out in accordance with the provisions of GB/T 18853.
6.3 Filter element structural integrity test
It shall be carried out in accordance with the provisions of GB/T 14041.1.
6.4 Compatibility test between filter element material and liquid
It shall be carried out in accordance with the provisions of GB/T 14041.2.
6.5 Filter element pressure drop flow characteristics test
It shall be carried out in accordance with the provisions of GB/T 17486.
6.6 Filter element structural strength test
It shall be carried out in accordance with the provisions of GB/T 14041.3 and GB/T 14041.4.
6.7 Filter element flow fatigue characteristics test
It shall be carried out in accordance with the provisions of GB/T 17488.
6.8 Clean filter element pressure drop test
6.8.1 The test device shall comply with the requirements of GB/T 17486.
6.8.2 Select a suitable filter housing. Adjust the test flow rate. Pass the filter housing at the rated flow rate of the filter element. Record the corresponding pressure drop.
6.8.3 Install the clean filter element in the filter housing. Adjust the test flow rate. Pass the filter at the rated flow rate of the filter element. Record the corresponding pressure drop.
6.8.4 The difference between the filter pressure drop with clean filter element installed and the filter housing pressure drop is the clean filter element pressure drop. Its value shall meet the requirements of 5.1.8.
6.9 Filter element limit pressure drop test
6.9.1 The test device shall comply with the requirements of GB/T 18853.
6.9.2 Carry out filter performance test in accordance with GB/T 18853. When the filter element limit pressure drop is reached, the filtering performance and structural strength of the tested filter element shall be ensured.
7 Inspection requirements
7.1 Exit-factory inspection
7.1.1 The inspection items, methods and technical requirements shall be as specified in Table 2.
7.1.2 The random inspection items and mandatory inspection items shall be as specified in the product technical documents. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1184-1996Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications
- GB/T 1800.2-2009Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
- GB/T 14041.4Hydraulic fluid power -- Filter elements -- Part 4: Method for rated end load test
- GB/T 18853Hydraulic fluid power filters -- Multi-pass method for evaluating filtration performance of a filter element
GB/T 14041.1 · GB/T 14041.2 · GB/T 14041.3 · GB/T 17446 · GB/T 17486 · GB/T 17488
Similar standards
GB/T 20080-2006|GB/T 18853-2015|GB/T 14041.1-2007|GB/T 17486-2006|GB/T 17488-2008|GB/T 17446-2012
Editions of GB/T 20080
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 20080-2017 | General specification for hydraulic filter elements | first revision | Current |
| GB/T 20080-2006 | General specification for hydraulic filter elements | first issue | Superseded |
This page sells the current edition, GB/T 20080-2017. Earlier editions are listed for reference only.
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Related Standards
GB/T 1184-1996 — Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications
GB/T 14041.4-2019 — Hydraulic fluid power -- Filter elements -- Part 4: Method for rated end load test
GB/T 18853-2015 — Hydraulic fluid power filters -- Multi-pass method for evaluating filtration performance of a filter element
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