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A hydraulic system circulates the same fluid repeatedly from a fixed reservoir that is part of the prime mover. The fluid is an almost non-compressible liquid so that the actuators it drives can be controlled to very accurate positions, speeds or forces. Most hydraulic systems use mineral oil for the operating media but other fluids such as water, ethylene glycol or synthetic types are not uncommon. Hydraulic systems usually have a dedicated power unit for each machine. They usually have a central power unit with pipes running to and from the presses out in the plant. Because these presses require no flow during their long closing times, a single large pump can operate several of them. These hydraulic systems operate more like a compressed-air installation because the power source is in one location.
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Scope and Importance:
Advantage of hydraulic-powered machine has over pneumatic ones are that they operate at higher pressure -- typically 1500 to 2500 psi. Higher pressures generate high force from smaller actuators, which means less clutter at the work area. The main disadvantage of hydraulics is increased first cost because a power unit is part of the machine. If the machine life is longer than two years, the higher initial cost is often offset by lower operating cost due to the much higher efficiency of hydraulics. Another problem area often cited for hydraulics is housekeeping. Leaks caused by poor plumbing practices and lack of pipe supports can be profuse. Another disadvantage could be that hydraulic systems are usually more complex and require maintenance personnel with higher skills. Many companies do not have fluid power engineers or maintenance personnel to handle hydraulic problems.
Hydraulic systems can be found today in a wide variety of applications ranging from small assembly processes to integrated steel and paper mill applications. Hydraulics enable the operator to accomplish significant work (lifting heavy loads, turning a shaft, drilling precision holes etc.) with a minimum investment in mechanical linkage through the application of Pascal’s law. Tech Navio's analysts forecast the Global Hydraulic Pump market to grow at a CAGR of 5.07 percent over the period 2015-2019.
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This page was last updated on 15th Sep, 2015
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