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Introduction to
Hydraulic Systems
This is the first lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson identifies the basic components of an
industrial hydraulic system and explains
their functions. Formulas, including
Pascal’s Law, are presented and their use in
determining values in a hydraulic system is
explained.
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Hydraulic Fluids
This is the third lesson in the iKNOW™
Industrial Hydraulic Power Library. The
lesson discusses the types, properties, and
functions of hydraulic fluids and the
components in which they are used.
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Hydraulic Pump
Applications
The fourth lesson in the iKNOW™ Industrial
Hydraulic Power Library, this lesson
discusses the various hydraulic pumps and
their applications. It also describes
symptoms of pump malfunction.
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Positive
Displacement Pumps
This is the fifth lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes various positive
displacement pumps and their components. The
lesson explains some of the causes of system
inefficiencies associated with fixed volume
pumps and describes applications in which
variable volume pumps are used.
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Hydraulic
Accumulators
This is the sixth lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes the common accumulators and
their schematic symbols. It also describes
the application and operation of an
accumulator in a hydraulic system. Safety
considerations for depressurizing and
pre-charging an accumulator are discussed.
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Pressure Control
Principles
This is the seventh lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes the functions of a pressure
relief valve in a hydraulic system and the
conditions necessary for normal operation of
a pressure relief valve. Pressure
characteristics, the relationship of
pressure and flow, and depressurization are
also discussed.
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Pressure Control
Operation
The eighth lesson in the iKNOW™ Industrial
Hydraulic Power Library, this lesson
presents various pressure control valves,
their operation, and components.
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Pressure Control
Valve Applications
This is the ninth lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes the proper operation of
pressure control valves used in various
applications.
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Directional
Control Principles
This is the tenth lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes various directional control
valves. The lesson explains the function of
the ports on a directional control valve and
instructs the process of tracing the various
flow paths through the valve. The lesson
also describes the centering conditions and
piloting arrangements commonly used with
directional control valves.
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Flow Control
Valves
This is the eleventh lesson in the iKNOW™
Industrial Hydraulic Power Library. The
lesson demonstrates how to determine speed
and flow rates and differential pressure. It
describes various valves, their components,
and their uses.
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Actuator
Cylinders
This is the twelfth lesson in the iKNOW™
Industrial Hydraulic Power Library. This
lesson describes the various cylinders used
in hydraulic actuators. It also describes
the operation of a cylinder controlled by
regulating flow or pressure, and the purpose
of a cylinder leak test.
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Hydraulic Motors
This is the final lesson in the iKNOW™
Industrial Hydraulic Power Library. General
knowledge of hydraulic schematics is
required. Review of the lesson, Hydraulic
Schematics, is recommended. This lesson
describes various hydraulic motors and their
functions. It also describes the operation
of various hydrostatic drive circuits and
the function of components and flowpath in a
braking circuit.