Excavator accessories 225-0300 ratio solenoid valve construction machinery accessories

一、Common reasons why the solenoid valve does not work after being energized

    ① Check whether the power cable is bad → Rewire and connect the connector;

    ② Check whether the power supply voltage is in the ± working range -→ normal position range;

    ③ Whether the coil is de-welded → re-welded;

    ④ Coil short circuit → replace coil;

    ⑤ Whether the working pressure difference is inappropriate → Adjust the pressure difference → or replace the appropriate solenoid valve;

    ⑥ The fluid temperature is too high → replace the corresponding cv solenoid valve;

    ⑦Impurities make the main valve core and moving core of the solenoid valve stuck → clean, if there is seal damage should replace the seal and install the filter;

    ⑧ The liquid viscosity is too large, the frequency is too high and the life has reached → replace the product.

二、Proportional electromagnet failure

       ① Due to the aging of the wiring socket (base) of the plug assembly, poor contact and the welding of the electromagnet lead, the proportional electromagnet can not work (can not pass the current). At this time, the meter can be used to detect, if the resistance is found to be infinite, you can re-weld the lead, repair the socket and plug the socket firmly.

     ② The faults of the wire nursery components include coil aging, wire burning, wire breaking inside the coil, and excessive coil temperature rise. The coil temperature rise is too large to cause the output force of the proportional electromagnet is not enough, and the rest will make the proportional electromagnet can not work. For the coil temperature rise is too large, you can check whether the current is too large, whether the coil enameled wire insulation is poor, whether the valve core is stuck due to dirt, etc., one by one to find out the cause and eliminate it; For broken wire, burnt out and other phenomena, the coil must be replaced 

     ③ The main reason for the armature assembly is that the armature and the friction pair formed by the magnetic guide sleeve wear during use, resulting in the increase of the force hysteresis of the valve. There is also a push rod guide rod and armature different heart, will also cause the increase of force hysteresis, must be excluded

      ④ Because the welding is not strong, or the welding of the magnetic guide sleeve is broken under the action of the proportional valve pulse pressure in use, so that the proportional electromagnet loses its function.

     ⑤ The magnetic guide sleeve deforms under the impact pressure, and the friction pair composed of the magnetic guide sleeve and the armature is worn during use, resulting in an increase in the force hysteresis of the proportional valve