محاضرة بعنوان أساسيات الهيدروليك – Basic Hydraulic

محاضرة بعنوان أساسيات الهيدروليك
Basic Hydraulic
Introduction.
The transmission and control of power by means of fluid under pressure is becoming used in all branches of industry. The only two types of this transmission are
1- hydraulics
2- pneumatics
In this course we shall discuss the hydraulic way.
Generally the pneumatic way deals with the use of compressed air as a fluid while hydraulic way deals with compressed liquids (water , oil) as a fluid.
What is hydraulics?
Function of hydraulic systems.
Advantage of hydraulic systems. Over pneumatic and mechanical systems
Disadvantage of hydraulic systems 0ver pneumatic and mechanical systems.
Advantage of pneumatic system over hydraulic and mechanical systems.
Disadvantage of pneumatic system over hydraulic and mechanical systems.
Hydraulic systems fundamentals.
Design point of view of components.
Component of hydraulic system.
Figure of hydraulic system.
1- drive motor.
– A.C. motor.
– D.C. motor.
– mechanical motor.
2- hydraulic fluid.
– hydraulic oil.
– water.
3- hydraulic power (pumps).
– gear pumps.
– vane pumps.
– piston pumps.
4- valves.
– pressure control valves
– direction control valves.
– flow control valves.
5- piping (lines)
– metals.
– rubber.
6- actuators.
– hydraulic motor.
– cylinders.
7- tanks.
– fluid tanks.
– surge tanks.
Valve symbol structure
Valve functions
Valve functions 5/3
Operators
Mechanical actuated valves.
Selection of center conditions.
Parallel and serious connection.
Shuttle valve.
Pressure control valves.
Simple relief valve.
Ball or poppet type.
Guided piston type.
Differential piston/poppet type.
Figure for pilot operated relief valve.
Pressure reduction valves.
Pressure sequence valves.
Unloading valve.
Flow control valves.
HYDRAULIC CYLINDERS
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