| 摘要 |
PROBLEM TO BE SOLVED: To provide a pilot hydraulic piping that reduces pulsation due to a pump and can secure sufficient durability without over-engineering.SOLUTION: A pilot hydraulic piping 1 disposed between a pump device 8 and a manipulation lever 9 is specified to a use pressure of 6 MPa to 8 MPa, to have an inner diameter of 6 mm to 12 mm, a breakage pressure of 6 to 9 times as large as the specified use pressure. A rubber hose part 2 having an embedded fiber-reinforced layer comprising braided fibers is disposed in at least a part thereof, and an expansion amount in the rubber hose part 2 is set to 5.0 ml/m to 11.0 ml/m at the specified use pressure. |
