# Working Principle of HYDRAULIC JACK or HYDRAULIC PRESS

HYDRAULIC JACK or HYDRAULIC PRESS

The hydraulic jack is a device used for lifting heavy loads by the application of much smaller force. It is based on Pascal’s law, which states that intensity of pressure is transmitted equally in all directions through a mass of fluid at rest.

WORKING PRINCIPLE: The working principle of a hydraulic jack may be explained with the help of Fig. 23. Consider a ram and plunger, operating in two cylinders of different diameters, which are interconnected at the bottom, through a chamber, which is filled with some liquid.

Fig. Hydraulic jack Fig. Plunger

Let

W= Weight to be lifted,

F = Force applied on the plunger,

A = Area of ram, and

a = Area of plunger.

Pressure intensity produced by the force F, p = F/Area of plunger = F/a

As per Pascal’s law, the above intensity p will be equally transmitted in all directions.

Therefore, The pressure intensity on ram = p = F/a = W/A or W= F(A/a)

Above Equation indicates that by applying a small force F on the plunger, a large force W may be developed by the ram.

Mechanical advantage of press = A/a

If the force in the plunger is applied by a lever which has a mechanical advantage (L/l) then total mechanical advantage of machine = (L/l)(A/a)

The ratio (L/l) is known as leverage of press.

Hydraulic jack may be employed for the following jobs:

• Metal press work (to press sheet metal to any required shape).
• Drawing and pushing rods.
• Bending and straightening any metal piece .
• Packing press.

### 31 Responses to “Working Principle of HYDRAULIC JACK or HYDRAULIC PRESS”

1. #### Somshankar

difficult to understand

2. #### HFO POWER PLANT

What should be the properties of fluids used in hydraulic hack?

3. #### yasir

eng inf abt thermodynamics

4. #### RAHUL KUMAR MAURYA

You help me to assigment of hydraulic thanks i am student of IERT ALLAHABAD RAHUL MAURYA 78********

Thanks, please dont give the phone no. on any public forum

Its awesome!

7. #### Kathelin liana

Yeah its good and it helped in in my physics project. I am in class VIII and it helped me very much.
THanks a lot.

8. #### Kathelin liana

But only give a bit easier diagram with properly labelled

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11. #### rishi khalate

it makes our way very easy to resolve or perform any cumbersome activity.

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13. #### Mayesh

It really helped for understanding science…and also builds our today”s science

14. #### Indrajeet kumar verma

its help me preparation of sem exam . IERT Allahabad

15. #### A passer by

Makes it incredibly easy to understand and apply the mechanisms and principles. I didn’t even realise you could apply the mechanism of pivot and lever to multiply the mechanical advantage. Thankyou.

One improvement: seperate out and number the diagrams so it’s immediately obvious what goes where (and second diagram is a bit…squashed).

Thanks a lot.

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18. #### Piyush katiyar

giving great ideas for studying science

19. #### Bhavika singh

Helped a lot in my project. Thanks☺

Our Pleasure. Thanks for the comment.

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Thanks

23. #### Sheehan Ghosh

Excelent content allocation.Well planned work Hard work appreciated.

24. #### PRATHEEP R

Thank you very much

25. #### William

Hi,
I like your site. I have a project am building using principle of hydraulic press system where effort and load move at high speed back and forth. I need your help. My questions are as follows:
1. How and what type of valves to I use if I need the fluid in the load and effort cylinders remain constantly full without emptying back to tank considering plunger and load move back and forth fast?
2. How to the valves refill the plunger when need be?
3. To improve load with relative small effort, how can I incorporate electric powering system?

26. #### sebalisa steven

thanks engineer

27. #### Ezeora, Boniface Ugochukwu

Needs Introduction to Hydraulics Technology.

Its awesome