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Company Profile
 Ningbo Histar Hydraulic Co.,Ltd.Specializing in the production of various types of hydraulic valves, the company has obtained ISO9001: 2000 quality system certification and CE certification. The products are widely used in metallurgy,petroleum,mining, engineering, construction, plasticization, chemical industry, machine tools, transportation and other fields, with sales regions all over the world. View details
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  • Pressure maladjustment caused by hydraulic control valve
    In the pressure control valve: the cone valve of the pilot valve is poorly matched with the valve seat; The pressure regulating spring is too soft or damaged; The damping hole of the main valve core is blocked, and the slide valve loses control; The main valve core is stuck in the open or closed position by dirt; When the overflow valve is used for remote control, its remote connection channel is too small or leaks; When the overflow valve is used as the unloading valve, the reversing valve cont
  • Pressure imbalance caused by hydraulic pump
    The axial and radial clearance of the hydraulic pump increases due to wear; The problem of "trapped oil" of hydraulic pump has not been solved satisfactorily; Poor machining and assembly accuracy of pump internal parts; The individual parts in the pump are damaged.
  • Pressure maladjustment caused by auxiliary elements
    The oil filter is blocked; The liquid flow channel is too small and the oil return is not smooth; The oil viscosity is too thick or too thin.
  • The working pressure of the hydraulic system is misadjusted
    The mechanical part is not well adjusted, and the friction resistance is too large; Air enters the system; Oil contamination; Motor power is insufficient or speed is too low; Failure of pressure indicating device, etc.
  • Noise caused by mechanical system vibration
    Unbalance of belt pulley, coupling, gear and rotating body and vibration of rolling body of rolling bearing; The hydraulic pump shaft is not concentric with the motor shaft or the coupling is loose; Poor pipe support, etc.
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