Wear resistance is a hydraulic fluid's ability to reduce
the wear rate in frictional boundary contacts.
Anti wear hydraulic fluids contain anti wear
components that can form a protective film on metal
surfaces to prevent abrasion, scuffing, and contact
Antiwear additives enhance lubricant performance and
extend equipment life.
Oxidation stability is a hydraulic oil's resistance to heat-
induced degradation caused by a chemical reaction
Hydraulic oils must contain additives that counteract
the process of oxidation, improve the stability and
extend the life of the fluid.
Without these additives, the quality of the hydraulic
oil will deteriorate quickly.
Compressibility is a measure of the amount of volume
reduction due to pressure.
Although hydraulic oils are basically incompressible, slight
volume reductions can occur under certain pressure
Compressibility increases with pressure and temperature
and has significant effects on high-pressure fluid systems.
It causes servo failure, efficiency loss, and cavitation;
therefore, it is important for a hydraulic oil to have low
Foam results from air or other gases becoming entrained
in the hydraulic fluid. Air enters a hydraulic system through
the reservoir or through air leaks within the system.
A hydraulic fluid under high pressure can contain a large
volume of dissolved or dispersed air bubbles. When this
fluid is depressurized, the air bubbles expand and produce
Proper foam inhibitors modify the surface tension on air
bubbles so they more easily break up.
Directional Control Valve
DIRECTIONAL CONTROL VALVE
To control a direction of hydraulic fluids.
MOTOR & PUMP
To energize the pump.
To distribute the fluid to system.
Metal forming machinery
Foundries & primary metals plants
Presses, including cushions, clutches & brakes
Automated assembly systems
Grinding & honing applications
Plastic injection & blow moulding
R & D test facilities
Plant central systems
Material handling & robotic systems
BASIC CIRCUIT & EXPLANATION
The animations show the
sequences in a basic
hydraulic circuit in simplified
form - the actuation and
spring return of the final
control element (4/2-way
valve), the advance and
return of the drive
component (double acting
cylinder) and the opening
and closing of the pressure