I need to control a 0-10V valve actuator by a 0-24V signal therefore I need to change the level of a 0-24V DC signal to a 0-10V one with a potentiometer to control the valve which accept this kind of controlling signal (0-10V). The input impedance of the valve is 100k and the signal impedance should be less than 1k. The Max load current is 1mA.
Could you please let me know if I can use a potentiometer in a voltage divider circuit followed by a emitter follower or any better idea?

 

Welcome to AAC!
Where did the figures of 1k and 1mA come from? They don't seem to tie in with a 100k input impedance.
Can you post a link to the valve datasheet?

 

Welcome to AAC!
Where did the figures of 1k and 1mA come from? They don't seem to tie in with a 100k input impedance.
Can you post a link to the valve datasheet?

Sure

 

Could you please let me know if I can use a potentiometer in a voltage divider circuit followed by a emitter follower

That should work. I simulated it using a 12k resistor and 10k pot as the divider (assuming a 24VDC supply), with a 750Ω ½W emitter resistor.

 

Thanks! I will try it and let you know the result