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The filtration precision is referred to as the filtration degree, that is, theFiltration efficiency。As pointed out in the literature on hydraulic system research, "nominal filtration degree" does not indicate a problem, soAircraft hydraulic systemIs no longer used in.However, for other areas that do not have much research on pollution, such as the automotive triple filtration industryfuel system , nor does it use the old term of nominal filter degree.
Chinese name
Filtering precision
Dimensions
According to the particles passing through the filter
Another term is "absolute filtration degree", which is determined according to the maximum size of particles passing through the filter.It is also eliminated in the fuel filter.Only β - value nominal method is specified for aircraft fuel filter.It is incorrect to continue to use the old method.
Filter precision conversion table
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Filtering precision: actuallyfilterOffilter elementHole diameter;The maximum particle size allowed when the solution containing impurities passes through the filter screen.
Mesh micron inch filtering precision conversion table
Mesh/mesh,Micro/micron,Inch/inch-
12 --------------1680-----------661
16 --------------1190-----------469
20----------------840------------331
25----------------710------------280
30----------------590------------232
35----------------500------------197
40----------------420------------165
45----------------350------------138
50----------------294------------117
60----------------250-------------98
70----------------210-------------83
80----------------177-------------70
100---------------149------------59
120---------------125------------49
140---------------105------------41
170----------------88------------35
200----------------74------------29
230----------------62------------24
300----------------50------------20
325----------------44------------17
400----------------36-----------12
Inches
zero point zero zero zero zero four
zero point zero zero zero one
zero point zero zero zero two
zero point zero zero zero four
zero point zero zero zero six
zero point zero zero zero eight
zero point zero zero one
U. S. Mesh
twelve thousand and five hundred
five thousand
two thousand and five hundred
one thousand two hundred and fifty
eight hundred
six hundred and twenty-five
five hundred
The filter precision mark is micron, which indicates the filter performance.The filtration efficiency (or filtration ratio) is measured and the filtration degree is formed.Usually, the filtration degree of the filter refers to the nominal filtration degree.
Note: the pore size does not indicate the degree of filtration
