Module 2 Flashcards
a method used to filter and remove large or heavy contaminants from hydraulic fluid
Settling
a rating of the percentage of contaminants of a particular size that a strainer or filter can stop from entering a system
Degree of Filtration
a unit for measuring the dimensions of fine particles; one-millionth of a meter
Micron
the relationship between the size of a strainer or filter opening and the size of the contaminant particles
Dirt Capacity
a medium that collects particles on a single surface; usually used with strainers
Surface Medium
a medium that collects particles on a number of surfaces arranged in layers; usually used with filters
Depth Medium
If hydraulic fluid is to function properly, it must be _____.
Clean
Water is _____ than hydraulic fluid.
Heavier
The rating of a filter or strainer that removes almost all of the particles up to a certain size is called its _____ rating.
Nominal
Fine contaminant particles usually are measured in _____.
Microns
When contaminants begin to pass through a filter, the maximum allowable _____ can be exceeded.
Pressure Drop
Name the two types of filter media used in hydraulic systems.
Surface, Depth
Abrasion migration generally takes place as a result of _____.
Vibration
Most strainers used in hydraulic systems have a surface medium made of _____.
Porous Wire Mesh
Inlet strainers should be mounted far enough below the fluid surface of a reservoir to prevent a(n) _____ from forming.
Suction Vortex (Whirlpool)
When in-line strainers are used, a coarse strainer is placed in the _____.
Reservoir
In-line strainer media usually are made of wound ribbon or _____.
Stacked Disks
Filters not only function more effectively than strainers do, they also maintain a low _____.
Pressure Drop
Wound-yarn filters are used with fluids that have _____ contaminant concentrations.
High
Pleating a paper medium increases its filtering _____.
Surface Area
To remove fine metal particles, magnetic plugs usually are mounted in the _____.
Fluid Reservoir
As a safety precaution when working on a hydraulic system, always treat the system as if it were _____.
Pressurized
