Pulsation control

Good evening,

Thank you to every one that answered and helped in my last question.

I am one step closer to building my jetter.

I have one last issue… I am trying to create a pulsation control, I’d like to control it from the back of my trailer.

And the pumps and engines are about 10 foot away.

I have seen a manufacturer use a needle valve at the back, and the. Connect a 1/4 check into the middle lower port.

Does anyone have any knowledge on how this might create pulsation? I’ve researched for weeks and chat GBT is just as useless.

All help is greatly appreciated.