hanson

Hi all.
I have a air pressure supply of 4 bar and I need to reduce it to say a few thousands Pa.
What I have now is a pressure regulator that can reduce the pressure to 0.1 bar, but I need a even smaller pressure.
Is there any device that I can use?
I heard something called throttle valve? is it something I can use?
It reduces pressure by percentage or to a certain level?
Please kindly help. Thanks.