Technic Information

Trouble Shooting guide

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.

Direct operated valve

● Pilot operated valve

● Pressure operated valve

● All valves

 

If couldn’t solve the issues and want a new one, view our quality valves!

NCM series NC5V Series Manifold

NCSY 5000 series pneumatic solenoid vale

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)

Probable causes: Possible solutions:
Coil not de-energized  Check power supply control circuit.
Excessive foreign matter jamming core in core -tube Clean valve;install strainer close to valve inlet.
Damaged disc or seat causing internal leakage Replace with new parts 
Binding core or damaged core tube Replace parts(Pls.Contact us).
Damaged spring Repalce with new spring.Never elongate or shorten spring.

 

 

-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)

Probable causes: Possible solutions:
Coil not de-energized  Check power supply control circuit.
Excessive foreign matter jamming core in core -tube Clean valve;install strainer close to valve inlet.
Damaged disc or seat causing internal leakage Replace with new parts 
Binding core or damaged core tube Replace parts(Pls.Contact us).
Damaged spring Repalce with new spring.Never elongate or shorten spring.
Plugged bleed orifice Clean orifice
Damaged pilot seat or pilot disc Replace with new parts 
Damaged diaphragm or piston Replace with new parts 
Insufficient pressure drop across the valve Valve might be oversized.Repalce valve by one having a smaller orifice.Increase pressure, If possible.

 

 

-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.

 

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