Failure analysis and troubleshooting methods Failure analysis and treatment methods Power does not operate Poor power connection Poor power supply voltage variation is not within the allowable range Short circuit or burn out the coil Connect the power line to adjust the voltage within the normal range Change the coil when the valve is opened Valve can not pass the fluid pressure or Working pressure does not meet the fluid viscosity or temperature does not meet the valve core and moving around the core mixed with impurities, impurities, pre-filter valve or pilot valve blockage Working frequency is too high or life expectancy Adjust the pressure or working pressure difference or replacement Suitable Products Replacement Suitable Products Internal cleaning, filter must be installed in front of the valve Clean the filter or pilot valve hole in time Re-select the product model or replace the new product Valve can not be cut off when the valve fluid viscosity Viscosity does not meet the fluid temperature Does not meet the spring deformation or Expiration of Service Life Valve Seat Defective or Adhesive Stolen Gasket Exits `Defective or Deformed Balance Hole or Throttle Clogged Operating Frequency Too High or End of Life Replacement Suitable Product Replacement Suitable Product Plus Gasket or Replacement Spring Cleaning , Grinding or updating, re-assembly and timely cleaning product model selection or change new Product leaks Loose pipe connections Loose pipe connections Outer seal damage Tighten bolts or take over threads Replace leaks in seals Severe fluid temperature misalignment Pilot valve seat and main valve seat are contaminated or defective Pilot and main valve seals come out or distort Spring Improper assembly, deformation, or expiration of working life Working frequency too high Adjust fluid temperature or replace Clean or grind if any Repair or replace Replace seal Change spring Select product model or replace new Product Noise excessive when energized Fastener loosening voltage Fluctuation, not within the scope of the fluid pressure or working pressure is not suitable for fluid viscosity does not meet the armature suction surface with impurities Tighten the adjustment to the normal range of pressure or work to adjust the pressure difference or replacement of products Replace the appropriate products promptly cleaned Failure causes Analysis and treatment methods Power does not act Power Wiring poor contact Poor power supply voltage variation is not within the scope of the coil short circuit or burnout Connect the power line to adjust the voltage within the normal range to replace the coil valve open fluid can not pass the fluid pressure or working pressure does not meet the fluid viscosity or temperature is not In line with the valve core and moving around the core mixed dirt, impurities valve Clogged filter or pilot valve Operating frequency too high or expiration of service life Adjusting pressure or working pressure differential or replacing suitable product Replacing suitable product Internal cleaning, filter must be installed in front of valve Clean filter or pilot valve in time Hole re-election of the product model or replacement of new products off the valve fluid can not cut off the fluid viscosity does not meet the fluid temperature does not meet the spring deformation or the end of life valve seat defective or adhesive stolen seal prolapse `defect or deformation balance hole or orifice blockage Use the working frequency is too high or life expectancy Replace the appropriate products Replace the appropriate products plus gaskets or replace the spring to clean, grind or update, re-assembly and timely cleaning is to re-select the product model or change the new product Leakage pipe joints loose pipe Damaged connection outer seal Tighten bolt or take over thread Replace leak in seal Severe fluid temperature Non-conformity Dirty or defective pilot valve seat and main valve seat Lever or deformation of pilot valve and main valve seal Spring misfit, deform, or expire Use the working frequency is too high Adjust the fluid temperature or replacement If there is cleaning or grinding repair or replacement Change the seal Change the spring Re-select the product model or replace the new product When the power is too loud noise Friction loose Voltage fluctuations, not within the scope of Fluid pressure or working pressure is not suitable Fluid viscosity does not meet Armature suction surface with impurities tighten Adjust to normal Adjust the pressure within the range or working pressure or replace the product replacement products suitable for timely cleaning