[AT] Hydraulic flow question?

[James Peck]

I believe some hydraulic valves use orifices to limit spool speed. Can you sketch the circuit for us?

[Carl Gogol] I just finished replacing a triple valve on my International 140 that controls a side mount Alamo (triumph) sickle bar mower.  I did it because I had the valve and the motor control on the "new" valve would reverse the
motor where the original would not.  This is handy when the mower jams.   
The problem I created is the two controls for the hydraulic rams for positioning the cutter bar are connected with ¼" hoses but the valve's ports are all ½', -- but so were the original valve's.  
Problem - just moving one of the control's levers for a ram will stall the tractor if opened all or most of the way.  
One solution - Limit the movement of the ram spools in some manner like using a spacer to limit spool travel.
Question - Is there a more hydraulicy correct way -  the original valve did not suffer this issue.  BTW- system is open center.
Carl
Manlius, NY

Humm- I wonder if the valve's high pressure bypass is not working or set too high?