Hydraulic Spool Valve Internal Clearances

[connectorguy]

Searching for information regarding the max/min clearances used on hydraulic spool valves, and why; i.e. limits due to fluid contaminants, leakage factors, diameter/length dependant, type of fluid, pressures, manufacturing/economic limits, etc.

 

[atad]

The spool clearance is generally dictated by the working pressure and the seal manufacturers recommended clearances for the seal design.