FUNDAMENTAL OF HYDRAULIC.pdf

FUNDAMENTAL OF HYDRAULIC

Pressure & Flow The Roles of Pressure & Flow  Pressure pushes, or exert force  Flow makes things move

What is Pressure ?

Pressure in Confined Fluids

Pascal’s Law

Pressure & Force Relationship

F P= A

P = Pressure F = Force A = Area

Hydraulic Lever Mechanical Lever

Energy Transfer in the Hydraulic lever

(A)

(B)

(C)

(D)

Flow Makes it Moves What is Flow

Velocity & Flow Rate

Velocity

Flow Rate

Flow Rate and Speed

Pressure and Force The Formation of Pressure

The Path of Least Resistance

Trouble in Equipment Using Oil Pressure

The Role of Gravity Natural Pressure

The Weight of a Fluid

What Causes Pressure

Loads Create Pressure

Pressure in Parallel Connection

Hydraulic Power in the Working Cylinder

Flow Increasing Flow Rate Brings Increased Speed Flow

Flow Closing Relief Valve Will Not Increased Speed

Hydraulic Systems and Energy

Hydraulics and Work

The Three Elements of Work

Hydraulic System Components

The Hydraulic Jack

Hydraulic Cylinder Operation

(3)

(4)

(5)

(6)

(7)

(8)

Pump Classification

What is a pump

 

Positif Pump Non Positif Pump

Types of Hydraulic Pumps

Piston Pumps:

Hydraulic Pump Displacement Fixed Displacement Pump Constant

E   n   g i   n e  Displacement O u  t    p u  t   Fixed flow

    w     o       l      F

Pressure

Set pressure

Hydraulic Output

Variable Displacement Pump Construction

E   n   g i   n e  O  u t    p u  V   a r   t   i   a b   l   e   F   l   o w  

    w     o       l      F

Pressure

Set pressure

Hydraulic Output

Actuator Classification What are Actuators?

(A)

(B)

Hydraulic Cylinder (A)

(B)

  r   o    t   o    M   c    i    l   u   a   r    d   y    H

Types of Hydraulic Motor

Displace ment and Torque

Valve Classification Pressure Control Valves

Directional Control Valve Volume Control Valves

  s   e   v    l   a    V    l   o   r    t   n   o    C   e   r   u   s   s   e   r    P

Directional Control Valves

Check Valves

Spool Directional Valve

Volume Control Valves

Volume Control valve Proportional Flow Divider

Circuit Diagram (Netral)

Circuit Diagram (Extend)

Line Classification

Advantages of Hydraulic System a. Flexibility

b. Force Multiplication

c. Smoothness d. Simplicity e. Compactness f. Economy g. Safety

Disadvantages of Hydraulic System Need for Good Maintenance