Both pneumatics and hydraulics are widely used across many modern day production facilities. Both are advanced technologies that allow for automation, increased productivity, greater control, and higher accuracy.
In order to establish which system is more appropriate, it is important to understand the differences between the two applications. There are also other relevant factors, such as the project budget, the cleanliness of the surrounding environment, and the availability of components.
Pneumatics v Hydraulics
Both pneumatics and hydraulics rely on the use of pressure to transmit energy.
Pneumatic systems operate using compressed air or nitrogen. These gases are readily compressible, and produce a controlled force, regardless of load resistance. Pneumatics is generally used for lower forces, but faster motion, meaning increased production.
A hydraulic system operates using an oil or a liquid to transmit energy, as opposed to a gas. These liquids are relatively incompressible. This means that the force is slow, but is suitable for heavier loads. Hydraulics are used when a certain amount of stiffness in position is required.
A hydraulic system is generally more complicated and costly to install. It is often used in heavyweight construction, aerospace manufacture, ship building, and marine technology.
Pneumatic systems are cleaner, as there is no use of oil. They are appropriate where sanitary conditions are necessary. Simple designs and a quick set up make them versatile and adaptable within production processes.
Pneumatic Conveying
Pneumatic conveying systems are expertly designed from concept, by specialists such as www.aptech.uk.com/pneumatic-conveying-systems/.
Pneumatic conveying can be operated via a vacuum or via a pressure system. Both can be configured to exacting standards and specifications, meaning that there is always a system that will ensure enhanced productivity. Pneumatic systems are safe, clean, simple to install, and easy to operate.
How hydraulic power developed and where it is used
Hydraulics rests on a principle set out by Blaise Pascal in 1648: pressure applied to a confined fluid is transmitted equally throughout it. A hydraulic press shows this clearly. A small force on a small piston creates pressure that is passed to a larger cylinder, producing an enormous force, which is why presses are so important in steel manufacturing.
In the 19th century, innovators such as Joseph Bramah and William Armstrong perfected equipment for delivering hydraulic power, and several cities built networks to run capstans, lifts and cranes. One of the best known served large parts of London’s West End, the City and the docks.
Today hydraulics are found in cars and petrol station fuel pumps as well as factories, and newer developments include electric flow amplifiers, load sensing valves and hybrid actuation for renewable energy. Manufacturers value hydraulic systems because they can be adjusted for new designs and added to existing lines with little disruption.
Everyday examples of fluid power at work
Pneumatics and hydraulics together make up what is known as fluid power, one of the most direct and safe ways to move or lift objects. Hydraulics uses a liquid to create movement and force, while pneumatics uses gases and vacuums.
That difference shapes where each is used. Pneumatics suits lighter and more fragile items, such as moving pills through medicine production or sending pods carrying cash and receipts around a shop. Hydraulics is chosen for strength and speed, and its examples are easy to spot, from construction vehicles to rollercoasters and fairground rides, which could not work without it.
Both forms of fluid power look set to remain central to manufacturing, construction and leisure for a long time to come.
Where hydraulic technology is heading
Hydraulics remains central to manufacturing, but the technology is changing. One clear trend is closer integration with electronics, with smart hydraulic components and digital controllers working together to deliver more efficient systems and improved safety.
Links to the Internet of Things are growing too. Intelligent sensors let manufacturers fine-tune processes, and control systems can predict when a component is due for replacement, cutting downtime and maintenance costs. Designs are also becoming more compact, using smaller motors to reduce power consumption, and 3D printing has already proved useful for producing custom parts such as servo valves.
Environmental pressure is shaping the sector as well. Demand for environmentally friendly hydraulic fluids is likely to rise as regulations tighten, and energy-efficient drive systems are especially useful in pressure supply stations. Both hydraulics and pneumatics will continue to be used in vehicle assembly, machine tools and process industries, with efficiency and reliability driving the choice between them.
