intro duc ti

8/2/2019 Intro Duc Ti

1/13

Introduction to Hydraulics

ClassAct SRS enabled.

In this presentation you will: identify the fundamental parts of a hydraulic system and safety

issues relating to hydraulics


2/13


Next >

In this presentation you will see whathydraulic systems are.

You will explore some of the safety

issues associated with hydraulicsystems and the fluids used inthem.


3/13


Components of Hydraulic Systems

All industrial hydraulic systems will have:

A fluid, usually oil.

A tank, or reservoir, to hold a

supply of the fluid.

A pump to cause the fluid to flow.

An electric motor, or engine,to drive the pump.

Hoses or tubing to carry the fluid.

Valves to control fluid flow,direction and pressure.

One or more actuators, usually cylinders or hydraulic motors,to do the work where mechanical movement occurs. Next >


4/13


1

Two engineers are discussing the components required to make anindustrial hydraulic system. Engineer A says a reservoir is needed tohold a supply of fluid. Engineer B says a motor driven pump is neededto cause the fluid to flow. Who is correct?

Question

A) Only engineer A

B) Only engineer B

C) Both engineer A and B

D) Neither engineer A or B


5/13


Compression of Fluids

Two cylinders are shown. Onecylinder contains a gas and theother contains a liquid.

If a downward force is applied tothe piston in the gas cylinder, thepiston will move down andcompress the gas.

Hydraulic cylinders use liquid,which is incompressible.

Closed cylindercontaining air

(gas)

Closed cylindercontaining

hydraulic fluid

(liquid) Next >

If a downward force is applied to

the piston in the liquid cylinder, thepiston will not move.


6/13


Hydraulic Fluids

The primary purpose of hydraulic fluid is to transmit force from one place toanother.

However, hydraulic fluids are alsorequired to:

Lubricate contact surfaces within thesystem.

Provide sealing of components, wheretight clearances are involved.

Protect system components against rust, oxidation and corrosion.

Remove heat generated within the system.

Next >

Prevent foaming when subjected to turbulence.


7/13


When selecting a hydraulic fluid for an application, consideration must begiven to the pressure, temperature and materials of the system.

Improper selection can lead to:

Premature failure ofcomponents.

Inadequate systemperformance.

The potential for fire.

Environmental pollution in theevent of loss of containment.

Next >


8/13


The main types of hydraulic fluid are:

Petroleum based fluids:Most common type of fluid.

Synthetic fire resistant fluids:Used where fire hazards or environmentalpollution are a concern.

Water based fire resistant fluids:Used where fire hazards or environmentalpollution are a concern.

Next >


9/13


Hydraulic Fluid Safety

Generally, hydraulic fluid:

Can cause skin and eye irritation.

Can cause medical problems. Ifingested; seek medical attentionimmediately.

Must be disposed of according toEnvironmental regulations.

May be corrosive.

May cause medical problems,if repeatedly inhaled.

Next >


10/13


2

Which of the following is NOT a function of hydraulic fluid?

Question

A) To cool system components

B) To lubricate system components

C) To protect against corrosion

D) To expand and seal components


11/13


Hydraulic Systems Safety

Here are some general safety procedures for working on hydraulic systems:

Always wear eye protection and appropriate clothing.

Never service the system while the pump is running (unless bleeding

the system).

Ensure that all line connections are tight and the lines are not damaged.Escaping oil under pressure is a fire hazard and can penetrate the skincausing serious injury.

Before disconnecting oil lines, relieve all hydraulic pressure anddischarge the accumulator.

Do not remove cylinders until the working units are resting on the floor orground, on safety stands or on blocks.

Next >


12/13


3

Which of the following tasks can be worked on, while the hydraulicpump is running?

Question

A) Removing cylinders

B) Bleeding the system

C) Disconnecting lines

D) Servicing the system


13/13


Summary

You should now be aware of:

The fundamental parts ofhydraulic systems

Hydraulic fluid

How to work safely with

hydraulic systems

End >

intro duc ti

Documents