POWER FOR SOLENOID VALVE

Our solenoid valve rating voltage and power is specification 24VDC and 18W. The solenoid valve(normally open) we tested was supply with 24VDC, after connect with the coil, the voltage was drop to 7VDC. Why this happen and what is advise to these problem? Is this power source need to continuously supply 24VDC into the solenoid valve?

Afiq You have overloaded your 24V power source.  The solenoid that you have provided a picture of, as Anthocyanina stated, is made to be powered with 230V AC.  Using a lower voltage source will not provide sufficient power to create the magnetism required to move the plunger.  Also, if the coil is made for AC and not DC, putting DC into it will also not provide sufficient power to create the magnetism required to move the plunger.

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Alright. Well note kmikemoo . I get your point.

  This is voltage before attach the solenoid valve coil.

 This is voltage after attach the solenoid valve coil

During this situation, the Solenoid Valve can't be close. So what is the issue?

the issue is that you are using 10% of the rated voltage of the solenoid. the voltage drops because the solenoid is a very big load for your power supply because it is specified to work with 10 times the voltage you are using

So, we need at least 230V to trigger the solenoid valve, and the load for power supply also specified with 230V?

It really sounds like you should get a qualified electrician involved to look at the whole thing, not just the solenoid.  If you can’t grasp that 230v is required to drive it in spite of the label you really ought not to be working with that voltage level.  It can kill you as quick as, or anyone who looks at it in future if it isn’t installed properly.

I see, well noted. about the solenoid valve when it comes to trigger the signal we have test by using our own converter and it can function to trigger. But when use the power source the valve not function to trigger close. Can use advise how the best way to troubleshoot this issue?