POWER FOR SOLENOID VALVE

I am not sure if I understand this correctly, but assuming you have a valve that needs 16 W of power (voltage is important!) and power supply that can supply more power (the same voltage that the valve needs), it is OK. Power supply won't damage a device if the supply is capable of delivering more power. Power = Voltage * Current. If the voltage is the same, the device will only draw the amount of current that it needs. Actually it is good practice to design a more powerful supply to cover spikes during powering on the device.

The supply voltage is 24V used. If the supply power not reach until 16W, the device still works and operate?

what is the operating voltage of the solenoid? if the solenoid operates at 24V, if the solenoid is rated to operate with 24V, your supply will work as the solenoid will only draw the 16W it needs. If the solenoid requires a higher voltage, it might still work, but not at full power. If the solenoid requires a lower voltage, it is likely to be damaged

Solenoids are inductors. There is a holding current (power) and inrush current.

The power supply needs to match the required voltage of the solenoid, provide the holding current, and also stay reasonably stiff to maintain voltage during short inrush current.

It depends on the solenoid inrush current whether the 36w power source has enough power to survive turning on. A capacitor across the power supply can help provide extra energy during the inrush when the solenoid is turned on.

Holding current is actually higher than initial current for a solenoid, since the solenoid appears like an inductor. It's not the same as (say) a DC motor, which will have a higher initial (inrush) current (unless it's stalled).

Inrush current can be three to 10 times higher than holding current and can cause extreme overheating conditions, resulting in coil burnout if it is prolonged. Source: MRO

www.mromagazine.com/.../

Not true if DC is applied.

In fact, not _always_ true for AC either; it depends on the AC frequency. Also, did you actually read your linked article? 

This makes no sense:

"resulting in coil burnout if it is prolonged" - that's no longer "inrush" when it's prolonged. 

The article is a bit misleading since it refers to inrush current when it means current when the solenoid armature is extended out of the coil. It may common to describe it this way but it's not that helpful.

However, it is true that an AC solenoid designed for a fast pull in may well draw a lot of current if mechanically constrained in some way.

Since the OP doesn't say if he is using AC or DC we are all a bit in the dark.

SO, as usual, more info needed please.

Afiq - pictures of the solenoid and the power supply, ideally showing the ratings label, would help !

MK