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The pipes of the circuit carry hydraulic oil from the hydraulic pump to the hydraulic devices. The pipes that carry pressurized oil are as important as arteries and veins are to the human body. |
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 Pipes and rubber hoses that can withstand the maximum hydraulic pressures in the relative circuit are used. |
| (1) Composition of the Hydraulic Hoses | |
| Tube Rubber | This prevents leakage of the fluid during use. |
| Wire-reinforced Layer | This prevents expansion and bursting of the inner surface rubber due to pressure. |
| Inter-layer Rubber | This prevents friction between the wires and strengthens the adhensiveness of the wire layer. |
| String Braid | This prevents damage to the wire layer from outside, and also prevents rusting. |
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| (2) Joints |
| There are flare joints and flareless joints. |
| Flare Joints The tip of pipe is expanded in a lap shape, creating a flare. Then the tapered end of the joint is inserted into the flare and tightened. |
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| Flareless Joint The sleeve that is installed on the pipe is pulled into the other pipe and tightened shut. |
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