hydraulics Flashcards
what are the two categories of hydraulic oil
petreleum based
synthetic based
what are the hydraulic O-rings made from, what temperature do they retain their elastic properties and what happens if that burn
they are made up of flurocarbon elastomers
they retain at 300’c
they give off toxic gases including hydrogen fluoride when burned
advantages of hydraulics over electric systems
.RELIABLE .SIMPLE AND EASY TO UNDERSTAND .EASILY REVERSED .INFINITE SPEED RANGE .NO SPARK RISK .HIGH TORQUE AT LOW SPPEDS .ABILITY TO WITHSTAND OVERLOAD .1/12 SIZE OF EQUILAVENT ELECTRIC MOTOR
disadvantage of hydraulics over electric systems
.fire risk on mineral oil systems
.noise
.risk of connection
.less efficient (85-95)
what type of oil is used on, stating number and colour?
submarines
type23& 45
T22, T42 and cvs
on a submarine they use ox 30 which is red in colour
on T42, T22 & CVS they use OX33 which is yellow/orange in colour
on type 23&t45 it used OX40 which is green in colour
when working with fluorocarbon elastomers you must wear what ppe
pvc gauntlets
rubber boots
pvc coveralls
full face visor
what is to be taken before welding or burning in the vicinity
safety precautions
what are the following oil additives
anti foam
anti oxidants
anti corrosion
demulsibilty
what are the requirements for hydraulic fluid
must flow easily
must be incompressible
give up heat readily
good lubrication properties
what are the most causes of contamination in hydraulic oil
.airborne particles and moisture .construction dirt .dirt in new fluid .dirt produced by wearing in new systems .dirt from human sources
what are the methods for reducing contamination
.good design .filtration and filter maintenance .operation of filter and clogging indicator .good working practises .guardian filter pack .caps on open ended pipes .clean working area
types of pump:
external gear type pump internal gear type pump the vane pump lobe pump piston type pumps(single) piston type pump(multi)
what does the swash plate control?
it controls the direction and flow of pressure
