First, check whether the
solenoid valve solenoid coil is faulty.
Give the two-position valve an open or close signal on the DCS, and then see if the solenoid valve gains or loses power. Generally, you can listen to the sound at the scene. If you can't hear it, there must be a problem with the coil. As for the solenoid valve itself, is there a problem?
If there is a problem with the solenoid coil, first check the wiring to see if there is a virtual connection or a short circuit. If there is no problem on the line, the solenoid valve coil is burned out. You can remove the solenoid valve wiring and measure with a multimeter. The valve coil is burnt out.
The reason is that the coil is damp, causing poor insulation and magnetic leakage, resulting in excessive current in the coil and burning, so it is necessary to prevent rainwater from entering the solenoid valve. In addition, the spring is too hard, the reaction force is too large, the number of coil turns is too small, and the suction force is not enough, which can also cause the coil to burn out.
Second, the hot coil is good, that is the problem of the solenoid valve itself.
Generally, it can be adjusted from 1 to 0 at the manual adjustment place to make the valve open. If it can be opened, it means that the coil is indeed the problem. Just change the coil. If it cannot be opened, remove the solenoid valve and see if it is It is not that the spool is stuck, or there are impurities blocked, and CCL4 should be used for correct cleaning.
However, considering that there are no conditions at the site, gasoline can be used, but no water can be used. After cleaning, it can be dried with on-site instrument gas. Be sure to remember the order of each part when disassembling. If you don't pay attention, it is easy to make mistakes when installing. If the sequence is wrong, even if you clean the solenoid valve, even if the solenoid valve has been turned on, it still cannot be opened!
