The hydraulic system on my FEL has a regenerative dump. If I put the joystick in slow dump position does the system dump the hydraulic fluid to the tank or does it return the oil to the other side of the cylinder? I Know the "Fast" dump does this.
I don't have the hydraulic circuit of your valve, but I would expect normal dump mode to send the return fluid to the tank. Do you have a service manual to check?
What are you wanting to achieve, a faster "slow dump"?
Fittings are available with different sizes of holes in the middle of them. They are installed in line on the existing hoses, usually at a existing connection point. The small hole slows down the actions of the hydraulics. A wide variety of types, such as one way, two way, adjustable, different types of threads etc. Sometimes available at tractor supply, Atwoods, or other such box store types.
Google hydraulic flow restrictions.
Quite a few articles in the forums over them also.