GB/T 20080-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20080-2017 | English | 135 |
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General specification for hydraulic filters element
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| GB/T 20080-2006 | English | 359 |
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Hydraulic fluid power -- Filters element -- General specification
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 20080-2017
GB/T 20080-2017: General specification for hydraulic filters element---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/GBT20080-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.100.60
J 20
Replacing GB/T 20080-2006
General specification for hydraulic filters element
Issued on: MAY 12, 2017
Implemented on: DECEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification... 6
5 Technical requirements... 7
6 Test requirements... 9
7 Inspection requirements... 10
8 Marks, packaging, storage... 11
9 Notes (reference to this Standard)... 12
General specification for hydraulic filters element
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 βx (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
5.1 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.
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.
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.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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