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Hydraulic and Pneumatic

Double and Single Acting Hydraulic Cylinder Applications

Life is easier and less complicated, thanks to hydraulics. The power of pressurized fluid makes it possible to lift and carry heavy loads and dig deep into the earth. When you choose hydraulic cylinders for your company, you have two main choices. You can go with double acting or single acting hydraulic cylinder applications. Which is the right choice? Let’s look at the issue a little closer and see. Single Action Hydraulic machines take fluid power and change it into mechanical power. Single action cylinders are the most common today. A piston, rod, and seal work together to form the stroke. Fluid enters and exits through the same port. A spring or flywheel mechanism holds the piston up. A control valve sends fluid to the cylinder, and it enters through the port (blind end). As fluid enters the barrel, pressure builds up, and it forces the piston down, moving the rod out (forward stroke). When a control valve directs fluid to leave the port, pressure subsides, and the piston returns to its original position from spring pressure (contraction stroke). The cycle repeats itself over and over in a single acting hydraulic cylinder. Double Action Double action cylinders have fluid ports on each side of the piston. As fluid enters one side, pressure pushes the piston away and this forces fluid out of the other port. After fluid flow reverses, the opposite action occurs. This process produces linear motion in two directions. You receive both push and pull power and excavation equipment commonly uses double action cylinders. Why Choose a Single Acting Hydraulic Cylinder? A single action cylinder only needs one hydraulic hose. They are cheaper than most double action cylinders and used for many applications. Because they work with gravity or spring return action, you have few parts to wear out, and this offers low maintenance and...

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Understanding the Telescoping Hydraulic Cylinder

In single stage hydraulic cylinders, the length of the cylinder is the sum of the stroke, the thickness of the piston, the thickness of the bottom and head, and the length of the connections. Sometimes the length that is necessary to complete a job will not fit into a machine. In this case, a telescoping hydraulic cylinder is used. In these cylinders the piston rod is used as a piston barrel and more piston rods are used, allowing the cylinder to extend to the required length. Keep reading to learn about the many advantages of the telescoping hydraulic cylinder. Basics of the Telescoping Hydraulic Cylinder Telescopic hydraulic cylinders are only a fraction of their total length when they are compacted. They consist of steel tubes, each of which gets progressively smaller to fit within the next. The largest tube or sleeve is referred to as the barrel and each of the smaller tubes are stages. Usually no more than six stages are used in order to maintain stability. During use a telescopic cylinder it extends like a telescope to its full length, thereby maximizing equipment functionality. There are two main types of telescopic hydraulic cylinders: single-acting and double-acting (although special designs do exist). Single-acting telescopic cylinders extend through the use of hydraulic pressure and compress through external forces such as gravity. Double-acting telescopic cylinders use hydraulic pressure to extend and contract themselves. Applications for Telescopic Hydraulic Cylinders The most commonly known application for telescopic hydraulic cylinders is dump trucks, where long output travel at varying angles in a challenge. Other applications include: Excavators Cranes Forklift mast cylinders Oil drilling rigs Roll off trucks Essentially, a telescoping cylinder is useful in any application in which something has to be pushed or raised at varying angles. Benefits of Telescopic Hydraulic Cylinders The main advantage the telescoping hydraulic cylinder has over other types of cylinders is that they are able to provide an exceptionally long stroke in a compact length. The collapsed length of these cylinders is typically 60% to 80% smaller than their extended length, therefore making them ideal for application in which mounting space is limited and a long stroke is...

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