Inflexible or rigid pipes or tubes are used in many hydraulic systems to transfer energy-generating liquid between different components to form a complete hydraulic circuit. Pipes and tubes can be rigid to bridge small amounts of space in a controlled manner. For example, in a hydraulic circuit contained within a small casing, there is no extra room for piping. Therefore, connections must be rigid and contained within the casing. Some hydraulic circuits have much more liberal spacing accommodations or even require connection flexibility to facilitate faster replacement or range of motion operations. For instance, many construction machines have external, flexible hydraulic hose connections so the tools are free to move.
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