Coil of Selonoid Valves

Selonoid valves will be active by its coils . But important tips about them is not only voltage 

For example look at this coil of hydraforce selonoid valves 

as you see : 24V 

But when you want to replace a damage coil you should select same coil exactly as same brand because :

Same resistance, same meterial to produce same magnetic force 

It is more important in hydraulic jacks to have same resistance, and same magnetic force when they are working as parallel