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Best Hydraulic Machines

Best Hydraulic Machines – Uses, Working Principles, Types & Applications

Hydraulic Machines, in principle, are based on the application of Pascal’s law, which says that the pressure exerted on a fluid is transmitted inside it in all directions with the same force. What is a hydraulic unit? Hydraulic means powered by pressure or movement of a fluid, such as water. 

In this article, we have collected for you the principle of operation and the main schemes of the most commonly used hydrostatic machines. A hydraulic press is used to obtain large compressive forces, which are necessary, for example, for deforming metals during pressure treatment (pressing, forging, stamping), when testing various materials, compacting loose materials, etc.

Scheme and Principle of Operation

The simplest scheme of a hydraulic machine, such as a hydraulic press, consists of two cylinders, A and B (small and large diameter), connected to each other by a tube C. Such a scheme is similar to the operation of communicating vessels.

In the small cylinder, there is a small piston of the hydraulic machine D, connected to the OKM lever, which has a fixed hinge support at point O, and in the large cylinder, there is a large piston of the hydraulic machine (plunger) E, which is integral with the platform F, on which the pressed body G is located.

The lever is operated manually or using a special motor. In this case, piston D begins to move down and exert pressure on the liquid underneath, which is transmitted to piston E and forces it, together with the table, to move until body G comes into contact with the stationary plate H.

With further lifting of the table, the process of pressing (compressing) the body G begins.

If this device is not used for pressing but only for lifting a load, i.e., represents the so-called hydraulic lift, then the fixed plate H, in this case, turns out to be superfluous and is excluded from the design.

Together with the parts indicated in the diagram, the hydraulic press is equipped with suction and discharge valves that regulate the operation of the press and a valve that protects it from rupture when the pressure increases excessively (the valves are not shown in the diagram).

The operation of a hydraulic press is explained by Pascal’s law. This talks about the hydrostatic paradox, where a cup of water added to a barrel causes it to burst.

Diverse Uses of Hydraulic Machines in Various Areas 

Hydraulic Machines

Hydraulics is now employed in almost every sector to move machines and equipment to complete various tasks. The Best Hydraulic Machines are used for the following purposes:

  • Cranes in construction, tractors in agriculture, forklifts in industry, and brakes in transportation are a few examples.


  • Hydraulic Machines employ hydraulic fluid pressure to power movement or as a fundamental energy source.


  • Hydraulic machinery includes dump trucks, aluminum or plastic extruders, cranes, jackhammers, and hose crimpers.


  • Hydraulic machinery also does metal stamping, injection molding, and hose crimping.


  • In amusement parks, spinning motors such as the Ferris wheel provide hours of entertainment. They employ hydraulic technology to power rides and then provide motion to them.


  • Hydraulics is a principle seen in almost every vehicle on the road. Brake fluid plays a vital role in how a vehicle’s brakes work. Pushing the brake pedal moves a rod and piston within the master cylinder, which has the intended effect of slowing or halting the vehicle.


  • Without a hydraulic system, lifting a large motor vehicle for repair and maintenance would be extremely difficult. Using hydraulic fluid, the mechanism assists in lifting any large weight to the required height.

Types of Hydraulic Machines and Their Applications

Types of Hydraulic Machines

Best Hydraulic Machines are divided mainly into two main classes:

  • Hydraulic Turbines


  • Hydraulic Pumps


Hydraulic turbine- Hydraulic motors are used to convert the hydraulic energy of the fluid flow into mechanical energy received on the motor shaft and used later for various purposes, mainly for driving working machines.

The most common representative of this group is the hydraulic turbine. Hydraulic turbines are usually installed in hydroelectric power stations, where they drive electric generators.

The energy of the water is converted in the turbine into mechanical energy on the shaft. The shaft drives the rotor of the electric generator, and mechanical energy is converted into electrical energy.

Hydraulic Pump- 
In pumps used to lift and move fluid through pipelines, the reverse process occurs. The mechanical energy supplied to the pumps from the motors that drive the pumps is converted into hydraulic energy in the fluid.

Pumps are the most common type of hydraulic machines that are used in all sectors of industry and agriculture. Pumps are used in water supply, heating, ventilation, boiler operation, and in many other areas of technology.

Hydraulic machines are very widely used at present in the oil industry. Pumps are used in the transportation of oil and oil products through pipelines, in the drilling of oil wells to supply them with flushing solutions, etc.

Also Read:- A Comprehensive Guide to Hydraulic Machine

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