Mechanical Systems 2 Flashcards
Name the 4 basic components of a hydraulic system
Selector valve
Actuator
Pump
Reservoir
What colour is vegetable based fluid
Blue
What colour is skydrol
Purple
What sources of power are used to drive a hydraulic pump
Engine
Electric
Air
Maybe RAT (ram air turbine)
What is pressure
Force/area
State pascals law
An increase in pressure on a confined liquid is transmitted equally and undiminished to all parts of the container
If a mineral based fluid is in a system, what solvents should be used to flush the system
Naptha, varsol, or Stoddard solvent
What is viscosity
Internal resistance to flow
What does the term “chemically stable” mean
Liquids ability to resist oxidation and deterioration for long periods
Which component will provide the initial pressurized fluid until the unloading valve can stop fluid return to the reservoir and supply the system
Accumulator
Explain the operation of a reversible hydraulic pump
Uses electric DC motor to oppose both ways
What is meant by the term cavitation
Vacuum bubbles in the fluid
What is a scupper
Catches fluid which may be spilled during replenishment
What’s the difference between constant displacement and variable displacement pumps
Constant: does not chamge the amount of fluid pumped
Variable: can change angle and change how much fluid is pumped when required from downstream pressure
What is the most common displacement pump
Gear pump
