Hydraulic Proportional – Common Proportional Spools

E-spool: All ports blocked
– Overlap 10% to 20% on each side
– Differential cylinder may creep, due to leakage in cylinder and spool
– Closed loop positioning requires a more advanced controller

V-spool: No deadband
– 1% underlap allows housing variation
– Only for closed loop control

W-spool: 2% to 3% open A to T, B to T
– Primarily for differential cylinders
– Only for open loop applications


Leave a Reply

Your email address will not be published. Required fields are marked *