A second hand solenoid hydraulic  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
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
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.

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