Hyds Flashcards
What is hydraulic actuation?
Transmission of force through the medium of liquid.
Advantages of using hydraulics compared to mechanical methods
Greater transmission of power.
Reduce pilot fatigue.
Less strength required.
Easier routing of parts.
Variations of speed.
Smooth and steady movements.
Units of pressure
Force per unit area
What is pascals law?
If a force is applied to a liquid in a confined space, pressure will be transmitted equally, without reduction, throughout the liquid and will react at right angles to all confining spaces.
What are the principles of hydraulic actuation?
It is the conversion of hydraulic energy into an output of force or torque.
What is in a basic hydraulic system?
Reservoir, hand pump, 4/2 way dcv, Jack
Purpose of a reservoir?
Store fluids to allow for small leaks.
Provide flow to the pump.
Accept return fluid.
Allow for Jack ram displacement.
What are hydraulic pipes made from?
Aluminium alloy
Steel
Titanium
How do you install rigid tubing?
They may be joined to either the end of an item, another section of rigid pipe or to a flexible hose.
Purpose and construction of flexible hoses?
Used to connect stationary parts with moving parts.
Constructed of 2 components:
Fluid resistant inner tube and the reinforcing braid.
What’s does the manufacturer put on flexible hoses so that you know it’s correctly installed?
Lay lines
Reasons why you can’t use one seal for everything?
System pressure
Type of fluid
Metal finish and clearance
Type of motion
Types of seal
V ring
U ring
Square section packing
Bonded seal
Properties of hydraulic fluid
Viscosity, chemical stability and flash point.
Types of hydraulic oil
Mineral and synthetic
Two types of hydraulic oil contamination
Abrasive and non-abrasive
When should hydraulic systems be sampled?
Routine sampling, unscheduled maintenance and suspicion of contamination.
Synchronised circuit components
Flow divider
Two way restrictor
Blow back valve
Emergency selector
Sequenced circuit components
Nrv
Dcv
Differential area jacks
Mechanical sequence valves
Prv special
Electrically operated sequence valves
Pilot operated check valve
One way restrictor
Pressure relief valve
Thermal relief valve
What are the different techniques for fault finding
Easter egging
Automated test equipment
Built in test equipment
Proceduralization
Decision tree
Heuristic
Hypothesis
Cautions when fault finding
Tunnel vision and test induced failure
Sources of information for connecting ground power
Topic 1
Topic 5a2
Topic 5b1
Mam-p and d
Aesos
Aeros
What do you check on the rig before using it?
Labels
Cables
Case
Face
Where can information about gas replenishing be found?
Topic 1
5a2
5b1
