How to deal with solenoid valve failure
Solenoid valve coil rated voltage DC12V, DC24V, AC24V (50/60Hz), AC110V (50/60Hz), AC220V (50/60Hz), AC380V (

50/60Hz). Generally used in the electrical design or AC220V (without installation of switching power supply, low cost, simple and easy to maintain line), or using DC24V

(Commonly safe voltage, switching power supply / solenoid valve coil are easy to repair and replacement).
The method of detecting bad solenoid valve: give the solenoid valve is controlled through the medium (liquid under pressure, a gas <Air>, the pressure range is the use of pressure solenoid valve

Around the median value), to give the solenoid valve coil is energized, if the media is to be controlled from on to off or from off to the on state of change, then the solenoid valve is good, whether

Then that is a problem.
Solenoid Troubleshooting
1, the coil shorted or open circuit:
Detection methods: first with a multimeter to measure the on-off, the resistance tends to zero or infinity, it shows the coil shorted or open circuit. If the measure of its resistance to normal (probably

Dozens of Europe), it can not explain the coil must be good (I once measured a solenoid valve coil resistance about 50 ohms, but the solenoid valve inoperative, replace the

Coil after all normal), proceed as follows final test: to find a small screwdriver to wear on the solenoid valve coil placed in the vicinity of the rod, and then to the solenoid valve is energized

If the sensed magnetic, then the solenoid valve coil is good, otherwise it is bad.
Approach: replace the solenoid valve coil.
2, plug / socket problem:
Symptom:
If there is a solenoid valve plug / socket kind, there may be a metal reed socket problem (author encountered), plug wiring problems (such as

Connect the power cord to the grounding line to go) and other reasons unable to supply to the coil. Preferably a habit: plug in the socket after the fixing screws on the

, Coil spool rod after the screw on the nut.
If the solenoid valve coil plug is equipped with a power indicator light-emitting diodes, then using a DC power supply drive solenoid valve that line will pick right, otherwise the indicator does not

Will be lit. Also, do not be different voltage levels with power indicator light emitting diode power plug replacement use, this will lead to light-emitting diodes were burned / Power

(Switching to a low voltage level plug) short circuit or light-emitting diodes is very weak (high voltage level for a plug).
If the power indicator without solenoid valve coil is not case polarity (unlike DC coil voltage transistor time relay and the coil are connected in parallel

Diode / resistor leakage circuit coil voltage DC relay <This intermediate relay as supplied mostly small Japanese>, need to distinguish the polarity).
Treatment methods: Fixed wiring errors, repair or replacement of plugs, sockets.
3, the spool questions:
Symptom 1: the solenoid valve of the pressure medium through the normal case, pressing the red manual push button the solenoid valve, the solenoid valve is no response (pressure medium

Qualitative change does not appear on-off), indicating that the spool must be bad.
Solution: Check the media for problems, such as compressed air if there were a lot of water (and sometimes the role of oil-water separator is not great, especially

When the piping design is poor pass compressed air to the solenoid valve will be many water), whether the liquid medium through a lot of impurities. And then clear the solenoid valve and piping

Water or impurities. If there is not, ask the service (if you have the time and patience necessary if @ _ @) or replace the valve, or simply put the entire electromagnetic valve is fully

Department replaced.
Symptom 2: After inspection, the coil is a coil and the coil is energized wife magnetic normal, but still does not operate the solenoid valve (solenoid valve manually when the button

Function may be normal), indicating that the spool is bad.
Approach: Repair or replace the valve, or simply put the entire electromagnetic valve is fully replaced.
As for the solenoid valve body repair, because many species are so many ways I can say no to repair a lot will not repeat them here.
Solenoid valve failure and exclusion
A solenoid valve does not work after power
Check the power wiring is re-wiring and connectors adverse → Connection
Check the power supply voltage is within ± working range - → tone induced normal position range
Coil is re-soldering desoldering →
→ Replace the coil shorted coil
Working pressure is inappropriate pressure → → Adjust or replace solenoid valve commensurate
Fluid temperature is too high → Replace the solenoid valve commensurate
Impurities so that the main valve and solenoid valve stuck → movable core cleaning, if seal is broken seals should be replaced and installed filters
Liquid viscosity is too large, the frequency is too high, and life has come to replace the product →
Second, the solenoid valve can not be closed
Moving the main spool or iron core seal is damaged → replace the seals
Fluid temperature, the viscosity is too high → Replace the solenoid valve counterparts
Impurities into the solenoid valve spool capacity for cleaning or moving core →
Spring has come to life or deformed → Replace
Throttle Kong Pingheng clogging → timely cleaning
Operating frequency is too high or life has come to → reelection products or update the product
Third, other cases
Internal leakage → Check seals for damage, poor assembly springs
External leakage → connections loose or the seal has been broken → tighten the screws or replace the seals
Noise when energized → chieftain on fasteners loose, tighten. Voltage fluctuation is not within range, adjust the voltage. Core pull or uneven surface impurities and timely

Clean or replace.
Scene quickly determine good or bad way solenoid valve
One, first check the solenoid valve solenoid coil is not failure?
On DCS to two valve to ON or OFF signal, and then see whether the pros and cons of electric solenoid valve, usually at the site can listen to the sound.
If you can not hear, that coil is definitely a problem, as the solenoid valve itself is not a problem? (Explained below)
If the solenoid problem, first check the wiring, see if they have virtual access, or a short circuit, if the problem is not on the line solenoid valve coil burned out,

Remove the solenoid valve wiring can be measured with a multimeter, if open, the solenoid valve coil burned out. Moisture causes the coil, magnetic flux leakage caused by bad insulation, causing the line

Circle current is too large to burn, so to prevent rainwater from entering the solenoid valve. In addition, strong spring, reaction force is too large, too few coil turns, suction can not make

Get coil burnt.
Second, if the coil is good, that is, the solenoid valve itself.
Can generally be used in place manually adjusted with effect from 1 word transferred to 0 position, so that the valve opening, if able to open it shows the problem is indeed a coil, the coil can change

, And if not open, on the demolition of the solenoid valve, spool see is not stuck, or there is a miscellaneous grains blocking, proper cleaning should CCL4, but without taking into account the conditions of the scene

, You can use gasoline, there is no water, you can, after cleaning the gas field instruments can be used for drying, demolition Always remember well when the order of the various components, pay attention to the words

, Loading time is very easy to make mistakes, even if you remember correctly, a good cleaning sequence solenoid valve, even through a solenoid valve has still not open!