Please help me to solve my problem. I buy the second hand solenoid hydraulic direction valve 3/4 (3 positions, 4 ways). But the almost of valve i see is lost the code,so i cannot determine the it is DC or AC current, i need the valve is DC 24V DO3 (10 gpm) or D05 (20 gpm), Can i use the resistance meter to guess it is DC 24 V.How much resistance of DC 24V solenoid directional vale.

I am not sure about your abbreviations DO3(10 gpm) or D05 (20gpm). Is this net bore and needed volume flow?

In this case this will have no meaning without additional data (pressure class, ingouing/outgoing pressure, fluid data, cv etc) and will in lesser degree say something about the necessary solenoid force.

To determin 24VDC or 24V50hz (or 48VDC, 110VDC or 230/50 240/60 or other common solenoid currencies) you could try the simple way:

Connect to 24VDC. Listen when turning current on/off if you can hear the solenoid click. Try to blow through and see if portflow changes, or connect air to test.

Same with 24V/50Hz filter

If not working it should be safe to try with 48 VDC.

If no function solenoid is broken or needs another current.

Note: some solenoids 230/50 or 240/60 needs a connector with integrated rectifier (forming DC). Theese solenoids will give a 'brumming' noise (at frequency rate) if connected without rectifier.

When looking inside the AC solenoid stator cavity at the stator pole piece, there is a small ring inserted into the face of the stator pole. This ring is known as a shading coil and is designed to obtain minimal pulsing in force. What this means is that the coil splits the pole into two separate parts which causes the flux of these parts to be out of phase. If not for this shading coil, the chattering sound that is commonly associated with AC solenoids would be more noticeable.

DC coils will have much higher resistance than AC coils because only resistance limits the current. In AC coils the inductance limits the current so the resistance will be much lower to limit heating. I do not know what exact resistance to expect, but measure resistance and then calculate what power the coil would use on DC. Coil wattage should be less than 10 or 20 watts I expect.

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