The term press, which derives from the Catalan word premsa, it has several uses. In this opportunity we are interested in its meaning as the machine used to compact or compress something.
Hydraulic, meanwhile, it is an adjective that is used to qualify what moves or moves through a fluid. Usually the notion is linked to Water.
From these ideas, we can move forward with the definition of hydraulic press. This is the name of a mechanism that has communicating vessels and pistons of water: with a slight force applied to the piston with a smaller area, a greater force is achieved on the piston with a larger area.
The operation of the hydraulic press is based on the so-called Pascal’s law, postulated by the French Blaise pascal at XVII century. According to Pascal, the Pressure that is exerted on a fluid that is contained in a non-deformable container is transmitted with the same intensity at all points of the fluid and in all directions. This means that, from small forces, much larger forces can be achieved.
The hydraulic press, in this frame, has two cylinders filled with Water or oil that are communicated with each other; in each one, pistons of different area that are in contact with the fluid are fitted. By exerting a force on the piston with a smaller area or section, a pressure is created in the water that is transmitted in its entirety to the rest of the fluid and reaches the other piston.
A hydraulic press, in short, allows multiply forces, obtaining large forces from small forces. This class of machines is often used for lift heavy bodies.