Solenoid valve repair, solenoid valve failure causes and failure repair methods

Failure cause analysis and repair method. The power supply does not operate. The power supply wiring has poor contact. The power supply voltage changes not within the allowable range. The coil is open or short-circuited. Tighten the power wiring so that the voltage is adjusted within the normal range. Repair or replace the coil. Valve opening time. The medium cannot flow. Medium pressure or working pressure. The viscosity and temperature of the medium are inconsistent. Dirt and impurities are mixed around the valve core and the moving iron core. The filter in front of the valve or the pilot valve hole is clogged. The working frequency is too high or the service life has expired. Adjust the pressure or working pressure difference or replace the suitable product. Replace a suitable product and clean the interior. A filter valve must be installed in front of the solenoid valve and cleaned in time. Change the product model or replace it with a new product. Leakage at the linkage is loose. The seal at the connection is damaged. Tighten the bolt or take over the thread. Replace the seal. Serious leakage. Medium temperature. The pilot valve seat and the main valve seat have impurities or defects. The pilot valve and main valve seals are detached or deformed. The spring is poorly assembled, deformed or has expired. The working frequency is too high during use. Adjust the medium temperature or replace it with a suitable product. Clean or grind again. Repair or replace, replace the gasket, replace the spring, change the product model or replace it with a new product, the medium cannot be cut off when closing the valve, the viscosity of the medium, the temperature does not meet the spring deformation or the life has expired, the valve core is worn or the sealing ring is seriously worn, the valve core and the moving iron core are mixed with impurities. Dirt or impurities, the valve seat is defective or dirt adheres to it, the sealing gasket is protruded, defective or deformed, the balance hole or the orifice is blocked, the operating frequency is too high or the service life has expired, replace it with a suitable product, add a gasket or replace the spring, if it is ZDF Adjust the adjustment screws A and B to compensate and clean them in time. Reinstall the backflush filter, clean it, grind it, replace it, and reassemble it. Clean it in time. Change the product model or replace it with a new product. The noise is too loud when power is turned on. The fasteners are loose and the voltage fluctuates, which is not within the allowable range. The internal medium pressure or working pressure difference is not suitable. The medium viscosity does not meet the requirements. There are impurities on the suction surface of the armature. Tighten and adjust to the normal range. Adjust the pressure, working pressure difference or replace the product with a suitable product. Clean it in time. Analysis of the cause of the failure. Analysis and treatment method. Power supply does not work. Power wiring. Poor contact, the power supply voltage does not change within the allowable range, the coil is open or short-circuited, and the power wiring is tightened so that the voltage is adjusted within the normal range. Repair the welding or replace the coil. Valve opening time, the medium cannot flow, the medium pressure or working pressure difference is inappropriate, the medium viscosity and temperature do not match the valve core. When dirt and impurities are mixed around the moving iron core, the filter in front of the valve or the pilot valve hole is clogged. When used, the working frequency is too high or the service life has expired. Adjust the pressure or working pressure difference or replace it with a suitable product. Replace it with a suitable product and clean the inside of the valve. The filter valve must be installed in advance and cleaned in time. Then change the product model or replace it with a new product. The leakage is loose at the linkage. The seal at the connection is damaged. Tighten the bolt or replace the pipe thread. The seal is leaking. Serious leakage. The medium temperature does not meet the requirements of the pilot valve seat and the main valve seat. There are impurities in the pilot valve seat and the main valve seat. Or defective pilot valve and main valve seals come out or are deformed. The spring is poorly assembled, deformed, or has expired. The operating frequency is too high during use. Adjust the medium temperature or replace it with a suitable product. Clean or grind it, repair or replace it. Replace the sealing pad. Replace the spring. Change the product model. Or the medium cannot be cut off when closing the valve with a new product. The medium viscosity or temperature does not meet the spring deformation or life expiration. The valve core is worn or the sealing ring is seriously worn. Dirt and impurities are mixed around the valve core and the moving iron core. The valve seat is defective or dirty. If the material seal is protruded, defective or deformed, the balance hole or orifice is blocked. If the operating frequency is too high or the service life has expired, replace it with a suitable product and add a gasket or replace the spring. If it is ZDF, adjust the adjustment screws A and B to compensate and clean them in time. Install the backflush filter, clean it, grind it, replace it, reassemble it and clean it in time. Change the product model or replace it with a new one. The noise is too loud when power is turned on. The fasteners are loose and the voltage fluctuates. The medium pressure or working pressure difference is not within the allowable range and is not suitable for the medium viscosity. There are impurities on the suction surface of the armature. Tighten and adjust to the normal range. Adjust the pressure, working pressure difference or replace the product. Replace the product with a suitable one. Clean it promptly. Analysis of the cause of the failure. Analysis and repair method. The power supply does not operate. The power supply wiring has poor contact. The power supply voltage changes not within the allowable range of the solenoid valve. The coil is open or short-circuited. Tighten the power supply wiring so that the voltage is adjusted within the normal range. Repair welding or replace the coil. The valve opening time does not allow the medium to flow. The medium pressure or working pressure difference is inappropriate. The medium viscosity and temperature are inconsistent. Dirt is mixed around the valve core and the moving iron core. The filter in front of the impurity valve or the pilot valve hole is clogged. The working frequency is too high or the service life has expired. Adjust the pressure or working pressure difference or replace the suitable product. Replace the suitable product and clean the interior. A filter valve must be installed in front of the valve and cleaned in time. Then change the selection. Product model or change to a new product. Leakage at the linkage is loose. The seal at the connection is damaged. Tighten the bolt or pipe thread. Replace the seal. Serious leakage inside. The medium temperature does not meet the requirements of the pilot valve seat and the main valve seat. There are impurities or defects in the pilot valve and main valve seals. Detached or deformed springs are poorly assembled, deformed, or have expired. The operating frequency is too high during use. Adjust the medium temperature or replace it with a suitable product. Clean or grind and repair.