R170W-7 R215W-7 Excavator Parts Travel Motor Valve Relief Valve XJDD-00622 410127-00356A 31NG-00257
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... the pressure in the hydraulic system. It balances the hydraulic flow entering and leaving the hydraulic cylinder by adjusting the flow channel, so as to balance the pressure of the system and avoid the impact of too high or too low pressure on the system....
Jin Guan Chen Machinery Parts Business Department, Tianhe District, Guangzhou
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