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30 Cards in this Set
- Front
- Back
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name two functions of a hydraulic system power unti |
move fluid, provide power/energy |
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the two most common prime movers used in a hydraulic system are a __ and __ |
electric motor and engine |
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list two primary parts of a basic pump |
piston , chamber |
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a __ pump design uses the up and down linear motion of a piston in a cylinder to move fluid through the unit
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reciprocal plunger |
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list two factors that must be considered when selecting a pump for use in a hydraulic system |
environment, operating pressure |
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the __ pump is the oldest of the pump designs used in current hydraulic system circuts |
piston |
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the __ vane pump achieves a pumping action because the centers of the pump rotor and the cam ring are off center |
unballanced |
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the individual piston volumes in the inline axial piston pump are determined by their position on an angular device called a __ plate |
swash |
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the hydraulic pump that is usually considered to have the highest continuous pressure capability uses the __ piston design |
radial |
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in a centrifugal pump the primary element of the pumping mechanism is called a |
impeller |
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name two categories of data typically found in information sheets provided by pump manufacturers |
part design, max and min operating pressure |
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the pressure at which a fluid begins to baporize is known as __ pressure |
vapor |
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a __ is used on reservoirs to allow the tank to take in or release air as the fluid level changes during system operation |
vent |
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what is the purpose of baffles |
disperse the flow around the entire reservoir, regulate temperature and particles |
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in general, the reservoir for a stationary industrial system should have a storage cap __ times the flow rate of the pump |
3 |
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what reservoir configuration is suitable for use with a pump that requires a positibve pressure on the inlet line |
l or overhead |
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energy that is lost because of high flow resistance produces __ which can cuase system operating problems |
heat |
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__ is a short duration, high pressure in a system that results from surges caused by control valve shifting or unexpected load changes during opperation |
shock pressure |
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flexible hydraulic hose is desirable in system involving movable machine members or where sever __ is a problem |
vibration |
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the size of hydraulic system tubing is indicated by the actual __ diameter of the tuble |
outside |
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a __ is a machined or fabricated element that provides a common hydraulic fluid supply to several system components. it may consist of something as simple as a pipe with fitings |
manifold |
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a hydraulic fitting can be attached by threads, crimping, or __ like was demonstrated in the industrial maintenance lab |
swaging |
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a __ standard pipe thread should be used when assembling pipe to prevent leakage when the joint is placed under high system pressure |
dry seal |
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describe 2 general methods used for securing an adapter fitting when attaching hydraulic conductors to fittings and major system components |
flared |
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name two situations tha may result if conductors and fitting are not carefully selected for a given hydraulic system |
leakage, cost, replacement of parts |
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excessive fluid velocity in a working line may produce __ flow, which can result in reduced system efficiency |
turbulent |
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it is typically recommended that the average fluid velocity in a hydraulic system working line should not exceed __ feet per second |
20 |
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name two factors that are important to consider when selecting hose for an installation |
chemical resistance, operating temp |
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true or false- low and high pressure hoses may be clamped together, although this is not an ideal configuration |
false |
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the oppposite of turbulent fluid flow in a pipe is called __ flow |
laminar |
