Parker Hannifin VO40 - Manual (Page 23)

19 Parker Hannifin Corporation
Open-Center Directional Control Valve
VO40
Catalog HY17-8505/UK
[60] – Spool Function
D
Double-acting (4-way) spool. Work ports blocked in the
neutral position.
EA
Single-acting (3-way) spool. Port “A” blocked in neutral.
Port “A” is active and Port “B” is plugged.
EB
Single-acting (3-way) spool. Port “B” blocked in neutral.
Port “B” is active and Port “A” is plugged.
M
Double-acting (4-way) spool. Work ports open to tank in the
neutral position. Note: A work section with this spool does
not have a transition check (load check).
F
Double-acting (4-way) spool with a 4th position in which
both work ports are connected to tank (float position).
Work ports are blocked in the neutral position.
DM
Double-acting (4-way) spool. Work port pressure is bled to
tank, when the spool is in the neutral position.
Bleed notch is designed for 1.9 LPM @ 69 bar.
(0.5 GPM @1000 PSI)
DA
Double-acting (4-way) spool. Work port “A” pressure is bled
to tank, when the spool is in the neutral position.
Bleed notch is designed for 0.5 GPM @1000 PSI.
(1.9 LPM @ 69 Bar)
DB
Double-acting (4-way) spool. Work port “B” pressure is bled
to tank, when the spool is in the neutral position.
Bleed notch is designed for 0.5 GPM @1000 PSI.
(1.9 LPM @ 69 Bar)
Ordering Information – Work Sections