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Write short note on Hydraulic press

Mumbai University > Electronics and telecommunication > Sem 7 > Applied Hydraulics

Marks: 08

Years: MAY 2016

1 Answer
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The hydrauloc press is a device used for lifting heavy weights by the application of a much smaller force. It is based on Pascal's law, which states that the intensity of pressure in a static fluid is transmited equally in all directions.

The hydraulic press consists of two cylinder of different diameters. One of the cylinder is of large diameter and contains a ram, while the other cylinder is of smaller diamtere and contains a plunger as shown in fig, The two cylinders are connected by a pipe, The cylinders and pipe contains a liquid through which pressure is transmitted.

When a small force F is applied on the plunger in the downward direction, a pressure is produced on the liquid in contact with the plunger, This pressure is transmitted equally in all direction and acts on the ram in the upward direction as shown in fig. The heavier weight placed on the ram is then lifted up.

Let

W = Weight to be lifted

F = Force applied on the plunger

A = Area of the ram

a = area of plunger and

p = Pressure intensity produced by force F

$\dfrac {\text{Force F}}{\text {Area of plunger}} = \dfrac Fa$

Due to Pascal's law, the above intensity of pressure will be equally transmitted in all directions. Hence the presure intensity at the ram will be = p = F/a

But the pressure intensity on ram is also = $\dfrac {\text {weight}}{\text {Area of ram}} \\ = \dfrac WA$

Equating the pressure intensity on ram

$\dfrac Fa= \dfrac WA \\ W=\dfrac Fa\times A$

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