TROUBLESHOOTING

1. Pilot operated diaphragm and piston valves

Problem	Probable cause	How to correct
Valve does not open when coil is energised.	No voltage supply. Voltage may be too low or incorrect.	Check voltage; voltage must be within declared limits (AC +/-10%; DC +/-5%).
	Pilot orifice is blocked.	Deassemble valve and clean pilot orifice.
	Diaphragm or piston ring is ruptured.	Replace damaged part.
	Dirt or calcium deposits within solenoid base is blocking solenoid core.	Deassemble valve and clean thoroughly; install strainer on the inlet side of valve.
	Inlet pressure is too high.	Reduce pressure if possible; consult our staff over valve's  suitability.
	Pressure difference is insufficient.	Valve may be oversized for your application; increase inlet pressure if valve permits or replace valve with smaller one.
	Solenoid base is damaged.	Replace damaged part.
	Coil is burned.	Replace coil. Refer to section 3 for probable causes of coil burning.
Valve does not close when coil is de-energised.	Coil is still energised.	Check electrical circuit.
	Flow direction is incorrect.	Check valve orientation; arrow mark on valve body indicates flow direction.
	Pilot orifice is blocked.	Deassemble valve and clean pilot orifice.
	Dirt or calcium deposits within solenoid base is blocking solenoid core.	Deassemble valve and clean thoroughly; install strainer on the inlet side of valve.
	Solenoid base is damaged.	Replace damaged part.
Valve does not shut tightly or it leaks.	Damaged sealing disc / diaphragm / valve seat / solenoid core spring. Foreign matter on valve seat / diaphragm.	Replace damaged part; never stretch or shorten core spring!
	Pressure difference is insufficient.	Valve may be oversized for your application; increase inlet pressure if valve permits or replace valve with smaller one,

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2. Direct acting valves

Problem	Probable cause	How to correct
Valve does not open when coil is energised.	No voltage supply. Voltage may be too low or incorrect.	Check voltage; voltage must be within declared limits (AC +/-10%; DC +/-5%).
	Inlet pressure is too high.	Reduce pressure if possible; consult our staff over valve's suitability.
	Dirt or calcium deposits within solenoid base is blocking solenoid core; solenoid base may be damaged.	Deassemble valve and clean thoroughly; replace damaged parts; install strainer on the inlet side of valve.
	Coil is burned.	Replace coil. Refer to section 3 for probable causes of coil burning.
Valve does not close when coil is de-energised.	Coil is still energised.	Check electrical circuit.
	Flow direction is incorrect.	Check valve orientation; arrow mark on valve body indicates flow direction.
	Dirt or calcium deposits within solenoid base is blocking solenoid core.	Deassemble valve and clean thoroughly; install strainer on the inlet side of valve.
	Solenoid base is damaged.	Replace damaged part.
Valve does not shut tightly or it leaks.
	Damaged sealing disc / valve seat / solenoid core spring.	Replace damaged part; never stretch or shorten core spring!

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3. Coils

Problem	Probable cause	Prevention
Coil is burned.	Dirt or calcium deposits within solenoid base blocking solenoid core.	Deassemble valve and clean thoroughly; install strainer on the inlet side of valve.
	Moisture is present inside coil.	Seal and tighten cable gland; make sure that plug seals are in place; use sealing set or special coil in humid environmet.
	Solenoid core does not move due to excessive fluid pressure.	Reduce pressure or install suitable valve; consult our staff over valve's suitability.
	Solenoid core is blocked due to damaged solenoid base or core spring.	Deassemble valve and clean thoroughly; replace damaged parts.
	Valve is missing parts or is not properly assembled.	Check valve assembly; replace missing parts if necessary.
	Supply voltage is too high or incorrect.	Check voltage; voltage must be within declared limits (AC +/-10%; DC +/-5%).
	Fluid and/or ambient temperature is too high.	Consult our staff over suitability of chosen valve / coil.

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