11.11 Filters Flashcards
why are filters used in hydraulic systems?
to clean the hydraulic fluid of contaminents. if contaminents were not used, systems could fail or malfunction
where can filter be located?
within the resevoir, i the pressure line, in retun lines or anywhere the manufacture decides it is needed
where could contamiation of the hydraulic system enter?
- wear of components,
- injestion through external seals,
- during servcing,
- maintenance,
- when the syetem is opened for replacement or repair of components
what size is filter grading in?
microns
what materials can filters come in?
- wire mesh
- stainless steel
- micro glass
- cellulose paper
what is a wire mesh filter most commonly used for?
surface cleaning
out of all the filter types, what filter has the best filtration quality?
micro glass
what are cellulose paper fliters manufacted from?
resin impregnated cellulose filter media
what are the main components of a filter assembly?
- the filter head assembly
- the filter bowl
- the filter element
- a filter bypass valve
what is the filter bowl?
the housing that holds the element to the filter heads. you may fid a frain plug on the filter bowl
why is a filter bypass valve present in a filter module?
so that oil will still flow if the filter is clogged
what is present on a filter module to indicate that the filter is clogged?
a filter differential pressure indicator
what visual sign is present when the bypass valve opens ?
a red button fitted on the filter module pops into view
how many types of filter differential pressure indicators are there and what are they?
- physical filter differential pressure indicators
- electrical switches
-continuous reading visual indicators - visual indicators with memory
how are visual indicators with memory presented?
magnetic or mechanically latched buttons or pins that extend when the differential pressure exceeds that for a servicable element
