Usually the solenoid valve malfunctions, such as the solenoid valve does not operate, the solenoid valve opens the fluid cannot pass, the fluid pressure or working pressure difference does not match, the fluid viscosity or temperature does not match, the valve cannot shut off the fluid and other failure phenomena.
The PFC Automation technical team has sorted the faults of different types of solenoid valves and their troubleshooting methods.The PFC Automation technical team has sorted the faults of different types of solenoid valves and their troubleshooting methods.
If couldn’t solve the issues and want a new one, view our quality valves!
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| NCM series | NC5V Series Manifold | NCB-22A Series | NCJ Series Angle Seat Valve - Thread Type |
-Direct operated valve
01 Problem: Valve will not operate when valve circuit is energized (working state)
| Probable causes： | Possible solutions： |
| Low volatge or no voltage to solenoid coil | Check voltage.For most valves,voltage should be higher than or at least equal to 85% of the nominal voltage(Un) of nameplate rating. |
| Burned out coil | See below remark of "coil fail". |
| Excessive foreign matter jamming core | Clean valve;install strainer close to valve inlet. |
| Binding core or damaged core tube | Replace parts(Pls.Contact us). |
| Excessive fluid pressure | Reduce pressure to valve nameplate pressure rating. |
02 Problem: Valve will not close or shift when valve circuit is de-energized (rest state)
-Pilot Operated valve
01 Problems: Valve will not operate when valve circuit is energized (working state)
| Probable causes: | Possible solutions: |
| Low volatge or no voltage to solenoid coil | Check voltage.For most valves,voltage should be higher than or at least equal to 85% of the nominal voltage(Un) of nameplate rating. |
| Burned out coil | See below remark of "coil fail". |
| Excessive foreign matter jamming core | Clean valve;install strainer close to valve inlet. |
| Binding core or damaged core tube | Replace parts(Pls.Contact us). |
| Excessive fluid pressure | Reduce pressure to valve nameplate pressure rating. |
| Insufficient pressure drop across the valve | Valve might be oversized.Repalce valve by one having a smaller orifice.Increase pressure, If possible. |
| Damaged diaphragm or piston | Replace damaged parts |
| Plugged or restricted pilot orifice | Clean valve and pilot orifice. |
02 Problems: Valve will not close or shift when valve circuit is de-energized (rest state)
-Pressure operated valves
01 Problem: valve will not operate when operator is supplied with pilot pressure (working state)
| Probable causes: | Possible solutions: |
| Pressure operated valve |
Check the pressure on the supply side of the valve;it must correspond to the values indicated on the namepalte. Caution:Observe the minimum pilot pressure values for the valve in NO or NC function with fluid entry above disc or back pressure |
02 Problem: Internal leaks
| Probable causes: | Possible solutions: |
| Incorrect outlet pressure;Disc/seat etc.not leaktight | Disassemble the valve body and clean the internal parts.Replace disc seal or valve,if necessary.Make sure to use recommended types of fluids. |
03 Problem: Leaks at Pilot connection
| Probable causes: | Possible solutions: |
| Incorrect pilot pressure | Check that pilot valve is properly tightened on valve operator.Observe tightening torques. |
-All valves
Coil failure is the most common issue for all valves.
| Probable causes: | Possible solutions: |
| Overvoltage | Check Voltage at coil.Voltage must conform to nameplate rating. |
| Damaged core or core tube causing inrush current to be drawn continuously | Check for damaged core and core tube, or damaged spring. Clean thoroughly and replace any damaged parts (Contact us). |
| Excessive foreign matter jamming core in core tube | Check for scale or foreign matter on the core or inside the core tube. Clean thoroughly and replace any damaged parts (Contact us). |
| Excessive fluid pressure | Reduce pressure or install suitable valve. |
| Excessive ambient or fluid temperature | Refer to the data listed for temperature Class E,Fand H |
| Missing solenoid parts | Install missing coil or housing and other metal parts or properly install incorrectly assembled metal parts.The metal parts and housing(if used) form part of the magnetic circuit and are required to provide the impedancve needed to limit current draw. |
| Moisture inside solenoid enclosure |
Waterproof the entrance conduit to prevent entry of moisture. If valve is mounted outdoors, check to see that: - coil connector is properly mounted(and connector seal is in palce - enclosure (if used)is weatherproof and seal is in place abd in good condition, use appropriate sealant where required. |
